{"id":2818,"date":"2026-03-26T12:53:18","date_gmt":"2026-03-26T16:53:18","guid":{"rendered":"https:\/\/www.lifetein.com\/blog\/?p=2818"},"modified":"2026-04-09T12:43:19","modified_gmt":"2026-04-09T16:43:19","slug":"unusual-amino-acids-26-diaminopimelic-acid-dap","status":"publish","type":"post","link":"https:\/\/www.lifetein.com\/blog\/unusual-amino-acids-26-diaminopimelic-acid-dap\/","title":{"rendered":"Unusual Amino Acids: 2,6-Diaminopimelic Acid (DAP)"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"640\" height=\"241\" src=\"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2026\/03\/DAP1.webp\" alt=\"DAP\" class=\"wp-image-2835\" srcset=\"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2026\/03\/DAP1.webp 640w, https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2026\/03\/DAP1-300x113.webp 300w, https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2026\/03\/DAP1-500x188.webp 500w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2,6-Diaminopimelic acid (DAP)<\/strong>&nbsp;is a unique&nbsp;<strong>non-proteinogenic diamino acid<\/strong>&nbsp;that occupies a unique position at the intersection of bacterial physiology, antibiotic development, and synthetic peptide chemistry. Structurally characterized as an&nbsp;<strong>\u03b1,\u03b1\u2032-diamino dicarboxylic acid<\/strong>&nbsp;with the molecular formula C7H14N2O4, DAP is distinguished by the presence of two chiral centers and two amino groups flanking a seven-carbon backbone. This unusual amino acid is an&nbsp;essential constituent of bacterial peptidoglycan&nbsp;and serves as the biosynthetic precursor to L-lysine in both bacteria and higher plants. Importantly, mammals lack this entire metabolic pathway and require lysine as a dietary essential amino acid, making DAP and its processing enzymes&nbsp;attractive targets for antibiotic development&nbsp;with minimal mammalian toxicity. Beyond its native biological roles, DAP has emerged as a valuable building block in synthetic peptide chemistry, enabling the creation of structurally constrained peptides with potential immunostimulant, antitumor, and sleep-inducing activities.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 id=\"key-takeaways\" class=\"wp-block-heading\">Key Takeaways<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>2,6-Diaminopimelic acid<\/strong>&nbsp;is a symmetrical diamino dicarboxylic acid with the molecular formula C7H14N2O4 and CAS number 583-93-7, existing in three stereoisomeric forms:&nbsp;<strong>LL-, DD-, and meso-DAP<\/strong>.<\/li>\n\n\n\n<li>The&nbsp;<strong>meso-DAP isomer<\/strong>&nbsp;is an&nbsp;<strong>essential cross-linking component of peptidoglycan<\/strong>&nbsp;in Gram-negative bacterial cell walls, while Gram-positive bacteria typically use L-lysine for this function.<\/li>\n\n\n\n<li>DAP is the&nbsp;<strong>biosynthetic precursor to L-lysine<\/strong>&nbsp;in bacteria and plants via the diaminopimelate pathway, a route completely absent in mammals.<\/li>\n\n\n\n<li>Analogues of DAP, including fluorinated, phosphonate, and heterocyclic derivatives, have demonstrated&nbsp;<strong>significant antibacterial activity<\/strong>&nbsp;by inhibiting key enzymes in the DAP\/lysine biosynthesis pathway.<\/li>\n\n\n\n<li>In peptide synthesis, DAP enables the construction of&nbsp;<strong>unusual peptides with C-termini at both ends<\/strong>, as well as complex structures incorporating diketopiperazine rings, which exhibit diverse biological activities.<\/li>\n\n\n\n<li>Custom synthesis of DAP-containing peptides for research applications is available through specialized providers like&nbsp;<strong>LifeTein<\/strong>, enabling studies of bacterial enzymes, immunomodulatory compounds, and potential therapeutic agents.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 id=\"chemical-fundamentals-of-26diaminopimelic-acid\" class=\"wp-block-heading\">Chemical Fundamentals of 2,6-Diaminopimelic Acid<\/h2>\n\n\n\n<h4 id=\"structural-characteristics-and-stereochemistry-of-dap\" class=\"wp-block-heading\">Structural Characteristics and Stereochemistry of DAP<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">2,6-Diaminopimelic acid is defined by its symmetrical structure: a seven-carbon dicarboxylic acid backbone with amino groups at both the C2 and C6 positions. The IUPAC name, 2,6-diaminoheptanedioic acid, accurately describes this arrangement.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The presence of&nbsp;<strong>two stereogenic centers<\/strong>&nbsp;gives rise to three possible stereoisomers: the&nbsp;<strong>LL-isomer<\/strong>&nbsp;(both chiral centers in the L-configuration), the&nbsp;<strong>DD-isomer<\/strong>&nbsp;(both in the D-configuration), and the&nbsp;<strong>meso-isomer<\/strong>&nbsp;(one center L, one center D). This stereochemical diversity is biologically critical, as different isomers serve distinct functions in bacterial metabolism and cell wall architecture.<\/p>\n\n\n\n<h4 id=\"natural-occurrence-and-biosynthetic-context\" class=\"wp-block-heading\">Natural Occurrence and Biosynthetic Context<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">DAP is a naturally occurring amino acid found in both bacteria and higher plants. Its discovery by Work in 1950 marked an important milestone in understanding bacterial cell wall composition. In nature, DAP is biosynthesized through the diaminopimelate pathway, which converts pyruvate and L-aspartate into L-lysine, with&nbsp;<strong>meso-DAP serving as the immediate precursor to lysine<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The pathway involves several enzymes that have become targets for antibiotic development, including&nbsp;<strong>diaminopimelate epimerase (DapF)<\/strong>, which catalyzes the interconversion of LL-DAP and meso-DAP, and&nbsp;<strong>diaminopimelate decarboxylase<\/strong>, which converts meso-DAP to L-lysine.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.lifetein.com\/peptide_synthesis_services.html?_gl=1*15bjc7l*_gcl_aw*R0NMLjE3NTIyNTk1NTEuQ2p3S0NBanc3TUxEQmhBdUVpd0FJZVhHSVpVMXFSOXh4MzJEX3d6U2NYYUx2aWhzLWYzMU1FZ3VOSDRhcW41NUJtZmM1RnN3MkdVR0tSb0NCS01RQXZEX0J3RQ..*_gcl_au*NzY2NTIxODguMTc1MTUyMjM4MQ..&amp;_ga=2.129734156.1835841867.1753856001-90406248.1735925224\" target=\"_blank\" rel=\"noreferrer noopener\">Find out more about peptide synthesis here<\/a>.<\/p>\n\n\n\n<h2 id=\"biological-significance-and-therapeutic-relevance-of-dap\" class=\"wp-block-heading\">Biological Significance and Therapeutic Relevance of DAP<\/h2>\n\n\n\n<h4 id=\"essential-role-in-bacterial-peptidoglycan\" class=\"wp-block-heading\">Essential Role in Bacterial Peptidoglycan<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The most critical biological function of DAP lies in its contribution to bacterial cell wall integrity. In&nbsp;<strong>Gram-negative bacteria<\/strong>, the&nbsp;<strong>meso-DAP isomer<\/strong>&nbsp;is incorporated into the peptidoglycan layer, where it acts as a&nbsp;<strong>cross-linking agent<\/strong>&nbsp;between glycan strands. Specifically, meso-DAP in the pentapeptide of peptidoglycan provides the attachment site that links the inner and outer membranes to the rigid cell wall structure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This function is absolutely essential for bacterial survival; disruption of DAP incorporation or biosynthesis leads to weakened cell walls and osmotic lysis. Importantly, because mammals lack DAP and its metabolic pathway,&nbsp;<strong>inhibitors targeting DAP utilization exhibit minimal mammalian toxicity<\/strong>, fulfilling the ideal criteria for antibiotic development.<\/p>\n\n\n\n<h4 id=\"the-daplysine-biosynthetic-pathway-as-an-antibiotic-target\" class=\"wp-block-heading\">The DAP\/Lysine Biosynthetic Pathway as an Antibiotic Target<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The diaminopimelate pathway represents a&nbsp;<strong>validated target for novel antibacterial agents<\/strong>&nbsp;<a href=\"https:\/\/www.sciencedirect.com\/topics\/pharmacology-toxicology-and-pharmaceutical-science\/diaminopimelic-acid\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S095741660300541X\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a>. Multiple enzymes in this pathway have been structurally characterized and exploited for inhibitor design:<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\"><strong>Enzyme Target<\/strong><\/th><th class=\"has-text-align-left\" data-align=\"left\"><strong>Function<\/strong><\/th><th class=\"has-text-align-left\" data-align=\"left\"><strong>Inhibitor Examples<\/strong><\/th><th class=\"has-text-align-left\" data-align=\"left\"><strong>Inhibition Effect<\/strong><\/th><\/tr><\/thead><tbody><tr><td><strong>Diaminopimelate Epimerase (DapF)<\/strong><\/td><td>Converts LL-DAP to meso-DAP<\/td><td>Aziridino-DAP analogues<\/td><td>Extremely potent inhibition; disrupts peptidoglycan synthesis&nbsp;<a href=\"https:\/\/www.sciencedirect.com\/topics\/pharmacology-toxicology-and-pharmaceutical-science\/diaminopimelic-acid\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/td><\/tr><tr><td><strong>meso-DAP Dehydrogenase (m-Ddh)<\/strong><\/td><td>Converts THDP directly to meso-DAP<\/td><td>Isoxazoline-containing DAP derivatives<\/td><td>Significant inhibitory potency&nbsp;<a href=\"https:\/\/www.sciencedirect.com\/topics\/pharmacology-toxicology-and-pharmaceutical-science\/diaminopimelic-acid\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/td><\/tr><tr><td><strong>DAP Decarboxylase<\/strong><\/td><td>Converts meso-DAP to L-lysine<\/td><td>\u03b1-(Halomethyl)diaminopimelic acids<\/td><td>Competitive inhibition of lysine biosynthesis&nbsp;<a href=\"https:\/\/www.sciencedirect.com\/topics\/pharmacology-toxicology-and-pharmaceutical-science\/diaminopimelic-acid\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/td><\/tr><tr><td><strong>DAP Aminotransferase (DAP-AT)<\/strong><\/td><td>Transamination step in pathway<\/td><td>Hydrazino-dipeptide analogues<\/td><td>Slow-binding inhibition; antimicrobial activity&nbsp;<a href=\"https:\/\/www.sciencedirect.com\/topics\/pharmacology-toxicology-and-pharmaceutical-science\/diaminopimelic-acid\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/td><\/tr><tr><td><strong>MurE (meso-DAP-adding enzyme)<\/strong><\/td><td>Incorporates meso-DAP into peptidoglycan precursor<\/td><td>Phosphinate inhibitors<\/td><td>Disrupts peptidoglycan assembly&nbsp;<a href=\"https:\/\/www.sciencedirect.com\/topics\/pharmacology-toxicology-and-pharmaceutical-science\/diaminopimelic-acid\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Research has demonstrated that certain DAP analogues achieve up to&nbsp;<strong>75% growth inhibition<\/strong>&nbsp;against bacterial strains, validating this approach for antibiotic discovery.<\/p>\n\n\n\n<h2 id=\"dap-synthetic-approaches-and-peptide-applications\" class=\"wp-block-heading\">DAP Synthetic Approaches and Peptide Applications<\/h2>\n\n\n\n<h4 id=\"stereocontrolled-synthesis-of-dapcontaining-peptides\" class=\"wp-block-heading\">Stereocontrolled Synthesis of DAP-Containing Peptides<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The incorporation of DAP into synthetic peptides presents both opportunities and challenges due to its two amino groups and stereochemical complexity. Researchers have developed sophisticated&nbsp;<strong>stereocontrolled synthetic strategies<\/strong>&nbsp;to access DAP-containing peptides with defined configurations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One elegant approach utilizes a&nbsp;<strong>chiral synthon derived from L-valine<\/strong>, specifically, a mono-lactim ether that serves as a template for constructing the DAP framework&nbsp;<a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0957416602000022\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a>. Alkylation with dihaloalkanes followed by elaboration yields optically active tripeptides with the general structure Val-(DAP)-Val, representing&nbsp;<strong>unusual peptides that are C-terminal at both ends of the chain<\/strong>. These compounds are valuable for studying structure-activity relationships and enzyme inhibition.<\/p>\n\n\n\n<h3 id=\"complex-peptide-architectures\" class=\"wp-block-heading\">Complex Peptide Architectures<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Beyond simple linear peptides, DAP enables the construction of&nbsp;<strong>conformationally constrained structures<\/strong>&nbsp;with diverse biological activities. Researchers have synthesized peptides incorporating a&nbsp;<strong>proline residue fused to a diketopiperazine ring<\/strong>&nbsp;containing the DAP skeleton. These fused ring systems resemble natural products such as brevianamides, which exhibit immunomodulatory, antitumor, and antibiotic properties.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">X-ray crystallography and computational modeling of these DAP-containing peptides have revealed important structural features, including the&nbsp;<strong>planar conformation of diketopiperazine rings<\/strong>&nbsp;and the influence of proline residues on overall molecular geometry. Such insights guide the rational design of peptide-based therapeutics.<\/p>\n\n\n\n<h4 id=\"biologically-active-peptide-analogues\" class=\"wp-block-heading\">Biologically Active Peptide Analogues<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Several classes of DAP-containing peptides have demonstrated promising biological activities:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u03b3-Glutamyl-diaminopimelic acid dipeptides<\/strong>: Synthesized via regioselective ring-opening strategies, these compounds show potential as&nbsp;<strong>immunostimulating agents<\/strong>&nbsp;<a href=\"https:\/\/www.sciencedirect.com\/topics\/pharmacology-toxicology-and-pharmaceutical-science\/diaminopimelic-acid\" target=\"_blank\" rel=\"noreferrer noopener\"><\/a>.<\/li>\n\n\n\n<li><strong>Hydrazino-dipeptide analogues<\/strong>: Designed as inhibitors of DAP aminotransferase, these compounds exhibit&nbsp;<strong>potent, slow-binding inhibition<\/strong>&nbsp;and antimicrobial activity against both Gram-positive and Gram-negative bacteria.<\/li>\n\n\n\n<li><strong>Phosphonate-containing DAP peptides<\/strong>: While the phosphonate analogues themselves showed weak enzyme inhibition, certain&nbsp;<strong>tripeptide derivatives<\/strong>&nbsp;demonstrated growth inhibition against specific bacterial strains.<\/li>\n\n\n\n<li><strong>Acylated DAP peptides<\/strong>: Conjugation of DAP-containing peptides with lauric or palmitic acid yields compounds with&nbsp;<strong>immunoadjuvant activity<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"research-applications-and-custom-synthesis\" class=\"wp-block-heading\">Research Applications and Custom Synthesis<\/h2>\n\n\n\n<h4 id=\"tools-for-studying-bacterial-enzymology\" class=\"wp-block-heading\">Tools for Studying Bacterial Enzymology<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">DAP and its analogues serve as indispensable tools for probing bacterial enzyme mechanisms. Researchers studying&nbsp;<strong>DAP epimerase<\/strong>,&nbsp;<strong>DAP dehydrogenase<\/strong>, and&nbsp;<strong>MurE<\/strong>&nbsp;rely on synthetic DAP-containing substrates and inhibitors to elucidate catalytic mechanisms and to screen for potential antibiotics. The availability of&nbsp;<strong>fluorinated, aziridino, and phosphonate derivatives<\/strong>&nbsp;enables detailed structure-activity relationship studies.<\/p>\n\n\n\n<h4 id=\"availability-from-commercial-sources\" class=\"wp-block-heading\">Availability from Commercial Sources<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">For research applications, high-quality DAP and custom DAP-containing peptides are available from specialized suppliers.&nbsp;<strong>LifeTein<\/strong>&nbsp;offers expertise in incorporating unusual amino acids like DAP into custom peptide sequences, enabling researchers to access complex structures for their specific investigations. These services include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Synthesis of DAP-containing peptides with defined stereochemistry<\/li>\n\n\n\n<li>Incorporation of DAP into cyclic peptides and constrained structures<\/li>\n\n\n\n<li>Production of DAP analogues for enzyme inhibition studies<\/li>\n\n\n\n<li>Rigorous quality control, including HPLC and mass spectrometry validation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.lifetein.com\/Rush-Peptide-Synthesis-Service.html?_gl=1*15bjc7l*_gcl_aw*R0NMLjE3NTIyNTk1NTEuQ2p3S0NBanc3TUxEQmhBdUVpd0FJZVhHSVpVMXFSOXh4MzJEX3d6U2NYYUx2aWhzLWYzMU1FZ3VOSDRhcW41NUJtZmM1RnN3MkdVR0tSb0NCS01RQXZEX0J3RQ..*_gcl_au*NzY2NTIxODguMTc1MTUyMjM4MQ..&amp;_ga=2.129734156.1835841867.1753856001-90406248.1735925224\" target=\"_blank\" rel=\"noreferrer noopener\">Find out about high-speed RUSH synthesis.<\/a><\/p>\n\n\n\n<h2 id=\"frequently-asked-questions-faq\" class=\"wp-block-heading\">Frequently Asked Questions (FAQ)<\/h2>\n\n\n\n<h4 id=\"what-is-the-difference-between-the-three-stereoisomers-of-dap\" class=\"wp-block-heading\">What is the difference between the three stereoisomers of DAP?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>2,6-Diaminopimelic acid<\/strong>&nbsp;exists as LL-, DD-, and meso-isomers due to its two chiral centers. The&nbsp;<strong>LL-isomer<\/strong>&nbsp;has both amino groups in the L-configuration, the&nbsp;<strong>DD-isomer<\/strong>&nbsp;has both in the D-configuration, and the&nbsp;<strong>meso-isomer<\/strong>&nbsp;has one L and one D center. The&nbsp;<strong>meso-DAP isomer<\/strong>&nbsp;is the biologically relevant form incorporated into bacterial peptidoglycan and serves as the immediate precursor to L-lysine.<\/p>\n\n\n\n<h4 id=\"why-is-dap-considered-a-target-for-antibiotic-development\" class=\"wp-block-heading\">Why is DAP considered a target for antibiotic development?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Mammals lack the entire diaminopimelate pathway and require dietary lysine, whereas bacteria depend on this pathway to synthesize both&nbsp;<strong>meso-DAP<\/strong>&nbsp;(for peptidoglycan) and&nbsp;<strong>L-lysine<\/strong>&nbsp;(for protein synthesis). Consequently, inhibitors targeting DAP biosynthesis enzymes or DAP incorporation into peptidoglycan exhibit&nbsp;<strong>selective antibacterial activity with minimal mammalian toxicity<\/strong>.<\/p>\n\n\n\n<h4 id=\"what-types-of-dap-analogues-have-shown-antibacterial-activity\" class=\"wp-block-heading\">What types of DAP analogues have shown antibacterial activity?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Several classes of DAP analogues demonstrate promising antibacterial effects, including&nbsp;<strong>fluorinated derivatives<\/strong>,&nbsp;<strong>aziridino-DAP<\/strong>&nbsp;(extremely potent against DAP epimerase),&nbsp;<strong>isoxazoline-containing analogues<\/strong>,&nbsp;<strong>phosphonate derivatives<\/strong>, and&nbsp;<strong>hydrazino-dipeptides<\/strong>. Some analogues achieve up to 75% growth inhibition against bacterial strains.<\/p>\n\n\n\n<h4 id=\"how-is-dap-incorporated-into-synthetic-peptides\" class=\"wp-block-heading\">How is DAP incorporated into synthetic peptides?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">DAP incorporation requires&nbsp;<strong>orthogonal protecting group strategies<\/strong>&nbsp;due to its two amino groups. Researchers typically use stereocontrolled synthesis starting from chiral synthons like mono-lactim ethers derived from valine. Specialized peptide synthesis providers such as&nbsp;<strong>LifeTein<\/strong>&nbsp;offer custom synthesis of DAP-containing peptides with defined stereochemistry and high purity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Paradisi, F., Porzi, G., &amp; Sandri, S. (2001). A new stereocontrolled synthesis of uncommon tripeptides derived from 2,6-diaminopimelic acid (2,6-DAP). Tetrahedron: Asymmetry, 12(23), 3319\u20133324. https:\/\/doi.org\/10.1016\/s0957-4166(02)00002-2<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Galeazzi, R., Garavelli, M., Grandi, A., Monari, M., Porzi, G., &amp; Sandri, S. (2003). Unusual peptides containing the 2,6-diaminopimelic acid framework: Stereocontrolled synthesis, X-ray analysis, and computational modelling. Part 2. Tetrahedron: Asymmetry, 14(17), 2639\u20132649. https:\/\/doi.org\/10.1016\/s0957-4166(03)00541-x<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Chatterjee, B., Mondal, D., &amp; Bera, S. (2021). Diaminopimelic acid and its analogues: Synthesis and biological perspective. Tetrahedron, 100, 132403. https:\/\/doi.org\/10.1016\/j.tet.2021.132403<br \/><br \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>2,6-Diaminopimelic acid (DAP)&nbsp;is a unique&nbsp;non-proteinogenic diamino acid&nbsp;that occupies a unique position at the intersection of bacterial physiology, antibiotic development, and synthetic peptide chemistry. Structurally characterized as an&nbsp;\u03b1,\u03b1\u2032-diamino dicarboxylic acid&nbsp;with the molecular formula C7H14N2O4, DAP is distinguished by the presence of &hellip; <a href=\"https:\/\/www.lifetein.com\/blog\/unusual-amino-acids-26-diaminopimelic-acid-dap\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":6,"featured_media":2835,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-2818","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-peptide_synthesis"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.8 - aioseo.com -->\n\t<meta name=\"description\" content=\"2,6-Diaminopimelic acid (DAP) is a non-proteinogenic diamino acid that plays a role in bacterial physiology, antibiotic development, and synthetic peptides.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Jesse Zuccaro\"\/>\n\t<meta name=\"google-site-verification\" content=\"xKDW6DUiGuZ6nwglNeWlVWTgzTtMPzas13ROL63ytTc\" \/>\n\t<meta name=\"msvalidate.01\" content=\"5B15601215D876311F84CFEFB0F72F18\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/www.lifetein.com\/blog\/unusual-amino-acids-26-diaminopimelic-acid-dap\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.8\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"LifeTein Peptide Synthesis Blog\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Unusual Amino Acids: 2,6-Diaminopimelic Acid (DAP) | LifeTein Peptide Blog\" \/>\n\t\t<meta property=\"og:description\" content=\"2,6-Diaminopimelic acid (DAP) is a non-proteinogenic diamino acid that plays a role in bacterial physiology, antibiotic development, and synthetic peptides.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/www.lifetein.com\/blog\/unusual-amino-acids-26-diaminopimelic-acid-dap\/\" \/>\n\t\t<meta property=\"fb:admins\" content=\"233983946638783\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2020\/02\/LifeTein-Blog1-2-scaled.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2020\/02\/LifeTein-Blog1-2-scaled.jpg\" \/>\n\t\t<meta property=\"article:tag\" content=\"peptide\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2026-03-26T16:53:18+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2026-04-09T16:43:19+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/LifeTein-LLC-233983946638783\/\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:site\" content=\"@lifetein\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Unusual Amino Acids: 2,6-Diaminopimelic Acid (DAP) | LifeTein Peptide Blog\" \/>\n\t\t<meta name=\"twitter:description\" content=\"2,6-Diaminopimelic acid (DAP) is a non-proteinogenic diamino acid that plays a role in bacterial physiology, antibiotic development, and synthetic peptides.\" \/>\n\t\t<meta name=\"twitter:creator\" content=\"@lifetein\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2020\/02\/LifeTein-Blog1-2-scaled.jpg\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"Unusual Amino Acids: 2,6-Diaminopimelic Acid (DAP) | LifeTein Peptide Blog","description":"2,6-Diaminopimelic acid (DAP) is a non-proteinogenic diamino acid that plays a role in bacterial physiology, antibiotic development, and synthetic peptides.","canonical_url":"https:\/\/www.lifetein.com\/blog\/unusual-amino-acids-26-diaminopimelic-acid-dap\/","robots":"max-image-preview:large","keywords":"","webmasterTools":{"google-site-verification":"xKDW6DUiGuZ6nwglNeWlVWTgzTtMPzas13ROL63ytTc","msvalidate.01":"5B15601215D876311F84CFEFB0F72F18","miscellaneous":""},"schema":null,"og:locale":"en_US","og:site_name":"LifeTein Peptide Synthesis Blog","og:type":"article","og:title":"Unusual Amino Acids: 2,6-Diaminopimelic Acid (DAP) | LifeTein Peptide Blog","og:description":"2,6-Diaminopimelic acid (DAP) is a non-proteinogenic diamino acid that plays a role in bacterial physiology, antibiotic development, and synthetic peptides.","og:url":"https:\/\/www.lifetein.com\/blog\/unusual-amino-acids-26-diaminopimelic-acid-dap\/","fb:admins":"233983946638783","og:image":"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2020\/02\/LifeTein-Blog1-2-scaled.jpg","og:image:secure_url":"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2020\/02\/LifeTein-Blog1-2-scaled.jpg","article:tag":["peptide"],"article:published_time":"2026-03-26T16:53:18+00:00","article:modified_time":"2026-04-09T16:43:19+00:00","article:publisher":"https:\/\/www.facebook.com\/LifeTein-LLC-233983946638783\/","twitter:card":"summary_large_image","twitter:site":"@lifetein","twitter:title":"Unusual Amino Acids: 2,6-Diaminopimelic Acid (DAP) | LifeTein Peptide Blog","twitter:description":"2,6-Diaminopimelic acid (DAP) is a non-proteinogenic diamino acid that plays a role in bacterial physiology, antibiotic development, and synthetic peptides.","twitter:creator":"@lifetein","twitter:image":"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2020\/02\/LifeTein-Blog1-2-scaled.jpg"},"aioseo_meta_data":{"post_id":"2818","title":null,"description":"2,6-Diaminopimelic acid (DAP) is a non-proteinogenic diamino acid that plays a role in bacterial physiology, antibiotic development, and synthetic peptides.","keywords":null,"keyphrases":{"focus":{"keyphrase":"DAP","score":87,"analysis":{"keyphraseInTitle":{"score":9,"maxScore":9,"error":0},"keyphraseInDescription":{"score":9,"maxScore":9,"error":0},"keyphraseLength":{"score":9,"maxScore":9,"error":0,"length":1},"keyphraseInURL":{"score":5,"maxScore":5,"error":0},"keyphraseInIntroduction":{"score":9,"maxScore":9,"error":0},"keyphraseInSubHeadings":{"score":9,"maxScore":9,"error":0},"keyphraseInImageAlt":{"score":9,"maxScore":9,"error":0},"keywordDensity":{"type":"high","score":0,"maxScore":9,"error":1}}},"additional":[]},"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":"","og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"Article","isEnabled":true},"graphs":[]},"schema_type":"default","schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":"-1","robots_max_videopreview":"-1","robots_max_imagepreview":"large","priority":null,"frequency":"default","location":null,"local_seo":null,"seo_analyzer_scan_date":null,"breadcrumb_settings":null,"limit_modified_date":false,"open_ai":null,"ai":{"faqs":[],"keyPoints":[],"titles":[],"descriptions":[],"socialPosts":{"email":[],"linkedin":[],"twitter":[],"facebook":[],"instagram":[]}},"created":"2026-03-10 16:47:13","updated":"2026-04-09 16:44:21"},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/www.lifetein.com\/blog\" title=\"Home\">Home<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\t<a href=\"https:\/\/www.lifetein.com\/blog\/category\/peptide_synthesis\/\" title=\"Peptide\">Peptide<\/a>\n\t\t<\/span><span class=\"aioseo-breadcrumb-separator\">&raquo;<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tUnusual Amino Acids: 2,6-Diaminopimelic Acid (DAP)\n\t\t<\/span><\/div>","aioseo_breadcrumb_json":[{"label":"Home","link":"https:\/\/www.lifetein.com\/blog"},{"label":"Peptide","link":"https:\/\/www.lifetein.com\/blog\/category\/peptide_synthesis\/"},{"label":"Unusual Amino Acids: 2,6-Diaminopimelic Acid (DAP)","link":"https:\/\/www.lifetein.com\/blog\/unusual-amino-acids-26-diaminopimelic-acid-dap\/"}],"_links":{"self":[{"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/posts\/2818","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/comments?post=2818"}],"version-history":[{"count":6,"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/posts\/2818\/revisions"}],"predecessor-version":[{"id":2845,"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/posts\/2818\/revisions\/2845"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/media\/2835"}],"wp:attachment":[{"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/media?parent=2818"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/categories?post=2818"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.lifetein.com\/blog\/wp-json\/wp\/v2\/tags?post=2818"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}