{"id":2960,"date":"2026-09-24T12:22:56","date_gmt":"2026-09-24T16:22:56","guid":{"rendered":"https:\/\/www.lifetein.com\/blog\/?p=2960"},"modified":"2026-09-24T12:22:57","modified_gmt":"2026-09-24T16:22:57","slug":"unusual-amino-acids-cyclohexylglycine-chg","status":"publish","type":"post","link":"https:\/\/www.lifetein.com\/blog\/unusual-amino-acids-cyclohexylglycine-chg\/","title":{"rendered":"Unusual Amino Acids: Cyclohexylglycine (Chg)"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2026\/09\/Cyclohexylglycine1.webp\" alt=\"Cyclohexylglycine \" class=\"wp-image-2990\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cyclohexylglycine (Chg)<\/strong>\u00a0is a non-proteinogenic amino acid that has emerged as a powerful building block in the design of peptide-based therapeutics. Structurally, it resembles phenylalanine but features a fully saturated<strong> cyclohexyl ring<\/strong> in place of the aromatic phenyl group, directly attached to the \u03b1-carbon. This seemingly subtle difference, the replacement of an aromatic system with a bulky, aliphatic carbocycle, confers a unique combination of\u00a0<strong>steric hindrance<\/strong>,\u00a0<strong>lipophilicity<\/strong>, and\u00a0<strong>conformational rigidity<\/strong>\u00a0that makes Chg an invaluable tool for peptide chemists seeking to enhance metabolic stability, modulate secondary structure, and improve target affinity<a href=\"https:\/\/www.benchchem.com\/de\/product\/B555394#5\" target=\"_blank\" rel=\"noopener\"><\/a>. Its strategic incorporation has enabled the development of clinically successful peptides such as the complement C5 inhibitor Zilucoplan, underscoring its translational relevance<a href=\"https:\/\/www.benchchem.com\/de\/product\/B555394#5\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/p>\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>Cyclohexylglycine (Chg)<\/strong>&nbsp;is a non-proteinogenic amino acid featuring a bulky, hydrophobic cyclohexyl side chain that imparts&nbsp;<strong>steric hindrance<\/strong>&nbsp;and&nbsp;<strong>conformational constraints<\/strong>&nbsp;to peptides<a href=\"https:\/\/www.benchchem.com\/product\/B555394#8\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/li>\n\n\n\n<li>Its incorporation significantly enhances&nbsp;<strong>metabolic stability<\/strong>&nbsp;by shielding the peptide backbone from proteolytic enzymes, often extending plasma half-life by&nbsp;<strong>more than 19-fold<\/strong><a href=\"https:\/\/www.benchchem.com\/product\/B555394#8\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/li>\n\n\n\n<li>Chg acts as a&nbsp;<strong>conformation-directing residue<\/strong>, promoting the formation of \u03b2-turns and 3\u2081\u2080-helices that can be critical for receptor binding and selectivity<a href=\"https:\/\/www.benchchem.com\/product\/B1358409\/docs#10\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/li>\n\n\n\n<li>The primary synthetic challenge is&nbsp;<strong>steric hindrance during coupling<\/strong>, which necessitates the use of potent reagents such as&nbsp;<strong>HATU<\/strong>&nbsp;and double-coupling strategies to avoid deletion sequences<a href=\"https:\/\/www.benchchem.com\/de\/product\/B555394#5\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/li>\n\n\n\n<li><strong>Fmoc-L-Chg-OH<\/strong>&nbsp;(CAS 161321-36-4) is commercially available, and custom synthesis services from providers like&nbsp;<strong>LifeTein<\/strong>&nbsp;enable researchers to incorporate this residue into complex peptide sequences.<\/li>\n\n\n\n<li>Chg has been successfully employed in&nbsp;<strong>clinically approved therapeutics<\/strong>&nbsp;(Zilucoplan) and in the design of&nbsp;<strong>antimicrobial agents<\/strong>&nbsp;active against MRSA and VRE<a href=\"https:\/\/www.benchchem.com\/de\/product\/B555063#1\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"chemical-and-structural-properties-of-cyclohexylglycine\" class=\"wp-block-heading\">Chemical and Structural Properties of Cyclohexylglycine<\/h2>\n\n\n\n<h4 id=\"defining-the-cyclohexylglycine-structure\" class=\"wp-block-heading\">Defining the Cyclohexylglycine Structure<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Cyclohexylglycine, also known as 2-amino-2-cyclohexylacetic acid, has the molecular formula C\u2088H\u2081\u2085NO\u2082 and a molecular weight of\u00a0<strong>157.21 g\/mol<\/strong><a href=\"https:\/\/www.peptidedb.com\/database\/Cyclohexylglycine.html\" target=\"_blank\" rel=\"noopener\"><\/a>. Its defining feature is the\u00a0<strong>direct attachment of a cyclohexyl group to the \u03b1-carbon<\/strong>, with no intervening methylene bridge, a structural distinction from the related residue cyclohexylalanine (Cha). This compact, rigid architecture eliminates the rotational freedom of the side chain, imposing significant\u00a0<strong>conformational restraints<\/strong>\u00a0on the peptide backbone<a href=\"https:\/\/www.benchchem.com\/de\/product\/B555394#5\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/p>\n\n\n\n<h4 id=\"isomeric-forms\" class=\"wp-block-heading\">Isomeric Forms<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Chg exists as two enantiomers:&nbsp;<strong>L-cyclohexylglycine<\/strong>&nbsp;and&nbsp;<strong>D-cyclohexylglycine<\/strong>. The D-isomer is particularly valued for its&nbsp;<strong>enhanced resistance to proteolytic cleavage<\/strong>, as the D-configuration is not recognized by endogenous proteases<a href=\"https:\/\/www.benchchem.com\/de\/product\/B555063#1\" target=\"_blank\" rel=\"noopener\"><\/a>. The hydrochloride salt of D-cyclohexylglycine (H-D-Chg-OH\u00b7HCl) is a commonly used building block for Fmoc-based solid-phase peptide synthesis (SPPS)<a href=\"https:\/\/www.benchchem.com\/zh\/product\/B556054#6\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/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=\"noopener\">Find out more about peptide synthesis here<\/a>.<\/p>\n\n\n\n<h2 id=\"biological-significance-and-mechanisms-of-action\" class=\"wp-block-heading\">Biological Significance and Mechanisms of Action<\/h2>\n\n\n\n<h4 id=\"enhanced-metabolic-stability\" class=\"wp-block-heading\">Enhanced Metabolic Stability<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The primary rationale for incorporating Chg into peptides is to improve their&nbsp;<strong>in vivo half-life<\/strong>. The bulky cyclohexyl group physically obstructs the approach of proteolytic enzymes to adjacent peptide bonds, providing a&nbsp;<strong>steric shield<\/strong>&nbsp;that is effective against both exopeptidases and endopeptidases<a href=\"https:\/\/www.benchchem.com\/product\/B555394#8\" target=\"_blank\" rel=\"noopener\"><\/a>. Quantitative data from structurally related residues suggest that substitution of a key phenylalanine with a cyclohexyl-containing analog can result in a&nbsp;<strong>greater than 19-fold increase<\/strong>&nbsp;in plasma half-life.<\/p>\n\n\n\n<h4 id=\"conformational-modulation\" class=\"wp-block-heading\">Conformational Modulation<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Beyond stability, Chg functions as a&nbsp;<strong>conformation-directing powerhouse<\/strong>. Its steric bulk at the \u03b1-carbon restricts backbone rotation, favoring the formation of&nbsp;<strong>\u03b2-turns and 3\u2081\u2080-helical structures<\/strong><a href=\"https:\/\/www.benchchem.com\/product\/B1358409\/docs#10\" target=\"_blank\" rel=\"noopener\"><\/a>. This pre-organization can enhance binding affinity by locking the peptide into its bioactive conformation, thereby reducing the entropic penalty of target engagement<a href=\"https:\/\/www.benchchem.com\/de\/product\/B555394#5\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/p>\n\n\n\n<h2 id=\"synthetic-challenges-and-solutions\" class=\"wp-block-heading\">Synthetic Challenges and Solutions<\/h2>\n\n\n\n<h4 id=\"the-steric-hindrance-barrier\" class=\"wp-block-heading\">The Steric Hindrance Barrier<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The same bulk that makes Chg so valuable also makes it&nbsp;<strong>difficult to incorporate<\/strong>. The cyclohexyl group hinders the approach of activated amino acids to the growing peptide chain, leading to&nbsp;<strong>low coupling efficiency<\/strong>&nbsp;and the formation of deletion sequences if standard protocols are used<a href=\"https:\/\/www.benchchem.com\/de\/product\/B555394#5\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/p>\n\n\n\n<h4 id=\"optimized-coupling-protocols\" class=\"wp-block-heading\">Optimized Coupling Protocols<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">To overcome these challenges, researchers employ:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Potent coupling reagents<\/strong>: HATU or HBTU, often with the additive HOAt or Oxyma Pure, are recommended over standard carbodiimides<a href=\"https:\/\/www.benchchem.com\/de\/product\/B555394#5\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/li>\n\n\n\n<li><strong>Double coupling<\/strong>: Repeating the coupling step with fresh reagents ensures complete acylation.<\/li>\n\n\n\n<li><strong>Ninhydrin monitoring<\/strong>: Qualitative tests after each coupling confirm the absence of free amines<a href=\"https:\/\/www.benchchem.com\/zh\/product\/B577091\/docs#14\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Fmoc-L-Chg-OH is commercially available, and specialized providers like&nbsp;<strong>LifeTein<\/strong>&nbsp;offer custom synthesis services that incorporate unusual amino acids such as Chg into challenging sequences, ensuring high purity and correct stereochemistry.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/www.lifetein.com\/blog\/wp-content\/uploads\/2026\/09\/Cyclohexylglycine2.webp\" alt=\"Cyclohexylglycine\" class=\"wp-image-2993\"\/><figcaption class=\"wp-element-caption\">Fmoc-L-Cyclohexylglycine-OH<\/figcaption><\/figure>\n\n\n\n<h2 id=\"therapeutic-applications\" class=\"wp-block-heading\">Therapeutic Applications<\/h2>\n\n\n\n<h4 id=\"zilucoplan-a-clinical-success-story\" class=\"wp-block-heading\">Zilucoplan: A Clinical Success Story<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The most prominent example of Chg in a clinically approved drug is&nbsp;<strong>Zilucoplan (Zilbrysq\u00ae)<\/strong>&nbsp;, a macrocyclic peptide inhibitor of complement component C5 approved for generalized myasthenia gravis. Chg is incorporated at position 14 of the peptide sequence, contributing to its&nbsp;<strong>metabolic stability and binding affinity<\/strong><a href=\"https:\/\/www.benchchem.com\/de\/product\/B555394#5\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/p>\n\n\n\n<h4 id=\"antimicrobial-and-enzyme-inhibitor-design\" class=\"wp-block-heading\">Antimicrobial and Enzyme Inhibitor Design<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Chg-containing peptides have demonstrated activity against&nbsp;<strong>MRSA and VRE<\/strong>&nbsp;with MIC values of 2\u20134 \u00b5g\/mL<a href=\"https:\/\/www.benchchem.com\/de\/product\/B555063#1\" target=\"_blank\" rel=\"noopener\"><\/a>. The residue also enables the design of potent&nbsp;<strong>DPP-IV inhibitors<\/strong>&nbsp;and&nbsp;<strong>HCV protease inhibitors<\/strong>&nbsp;with improved cellular activity<a href=\"https:\/\/www.benchchem.com\/de\/product\/B555063#1\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/p>\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=\"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-cyclohexylglycine-and-cyclohexylalanine\" class=\"wp-block-heading\">What is the difference between cyclohexylglycine and cyclohexylalanine?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Cyclohexylglycine (Chg) has the cyclohexyl ring&nbsp;<strong>directly attached to the \u03b1-carbon<\/strong>, whereas cyclohexylalanine (Cha) contains an additional methylene bridge. This makes Chg&nbsp;<strong>more sterically constrained<\/strong>&nbsp;and rigid, while Cha is slightly more flexible<a href=\"https:\/\/www.benchchem.com\/de\/product\/B555394#5\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/p>\n\n\n\n<h4 id=\"why-does-cyclohexylglycine-enhance-peptide-stability\" class=\"wp-block-heading\">Why does cyclohexylglycine enhance peptide stability?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The bulky cyclohexyl group provides&nbsp;<strong>steric hindrance<\/strong>&nbsp;that physically blocks proteolytic enzymes from accessing adjacent peptide bonds, thereby protecting the peptide from degradation and extending its half-life<a href=\"https:\/\/www.benchchem.com\/product\/B555394#8\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/p>\n\n\n\n<h4 id=\"can-cyclohexylglycine-be-incorporated-using-standard-spps\" class=\"wp-block-heading\">Can cyclohexylglycine be incorporated using standard SPPS?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Yes, but with&nbsp;<strong>optimized protocols<\/strong>. The steric hindrance necessitates the use of potent coupling reagents (HATU, HBTU) and double-coupling strategies to achieve efficient incorporation<a href=\"https:\/\/www.benchchem.com\/de\/product\/B555394#5\" target=\"_blank\" rel=\"noopener\"><\/a>. Fmoc-L-Chg-OH is commercially available for this purpose.<\/p>\n\n\n\n<h4 id=\"is-dcyclohexylglycine-more-stable-than-the-lisomer\" class=\"wp-block-heading\">Is D-cyclohexylglycine more stable than the L-isomer?<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Yes. The&nbsp;<strong>D-configuration<\/strong>&nbsp;is not recognized by endogenous proteases and, combined with the steric bulk of the cyclohexyl side chain, provides enhanced resistance to enzymatic cleavage<a href=\"https:\/\/www.benchchem.com\/de\/product\/B555063#1\" target=\"_blank\" rel=\"noopener\"><\/a>.<\/p>\n\n\n\n<h2 id=\"references\" class=\"wp-block-heading\">References<br \/><\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.benchchem.com\/product\/B555394#8\" target=\"_blank\" rel=\"noopener\">Cyclohexylglycine | BenchChem [benchchem.com] <\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/pubchem.ncbi.nlm.nih.gov\/compound\/Cyclohexylglycine_-_R\" target=\"_blank\" rel=\"noopener\">Cyclohexylglycine, (R)- | C8H15NO2 | CID 736849 &#8211; PubChem [pubchem.ncbi.nlm.nih.gov]<\/a><\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>Cyclohexylglycine (Chg)\u00a0is a non-proteinogenic amino acid that has emerged as a powerful building block in the design of peptide-based therapeutics. Structurally, it resembles phenylalanine but features a fully saturated cyclohexyl ring in place of the aromatic phenyl group, directly attached &hellip; <a href=\"https:\/\/www.lifetein.com\/blog\/unusual-amino-acids-cyclohexylglycine-chg\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":6,"featured_media":2991,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-2960","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 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"Cyclohexylglycine (Chg) is a non-proteinogenic amino acid that has emerged as a powerful building block in the design of peptide-based therapeutics.\" \/>\n\t<meta name=\"robots\" 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15:56:06","updated":"2026-09-24 16:22:57","focus_keyword":"Cyclohexylglycine","additional_keywords":null,"truseo_locale":null},"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\">\u00bb<\/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\">\u00bb<\/span><span class=\"aioseo-breadcrumb\">\n\t\t\tUnusual Amino Acids: Cyclohexylglycine (Chg)\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: Cyclohexylglycine 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