D amino acid peptide | LifeTein Peptide Blog https://www.lifetein.com/blog LifeTein: Custom Peptide Synthesis Service Sun, 17 Nov 2024 03:38:19 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://www.lifetein.com/blog/wp-content/uploads/2023/10/cropped-android-chrome-512x512-1-32x32.png D amino acid peptide | LifeTein Peptide Blog https://www.lifetein.com/blog 32 32 D-amino acid peptides to resist common proteases https://www.lifetein.com/blog/d-amino-acid-peptides-to-resist-common-proteases/?utm_source=rss&utm_medium=rss&utm_campaign=d-amino-acid-peptides-to-resist-common-proteases Wed, 28 Mar 2012 14:45:07 +0000 http://www.lifetein.com/blog/?p=111 Proteins and most naturally occurring peptides are composed of amino acids in the L-configuration. However, D-amino acids have been detected in a variety of peptides synthesized in animal cells. Examples include opiate and antimicrobial peptides from frog skin, neuropeptides from … Continue reading →

The post D-amino acid peptides to resist common proteases first appeared on LifeTein Peptide Blog.]]> About D-Amino Acid Peptides The design of all-D-peptides has been applied to increase bioactive peptides’ resistance to endogenous enzymes, as well as their bioavailability. Retro-inverso peptides are obtained by replacing the standard L-amino acid residues with the corresponding D-amino acids and reversing the direction of the peptide backbone. Therefore, the original spatial orientation and the chirality of the side chains is unchanged. This results in a non-complementary side chain topochemistry between the analog and the parental L-peptide. The significantly improved biostability of D-peptides usually leads to longer in vivo circulation half-time, making the D-peptide based drug delivery system more attractive and efficient than their L-peptide counterparts. Success has been achieved immunologically in using retro-inverso peptides toward antigenic mimicry of their parent l-peptides. It was found that the retro-all-d-peptide isomer of p53(15–29), like its parent l-peptide, adopted a right-handed helical conformation in the complex. However, in some cases, the retro-inverso isomers are significantly inferior to their parent l-peptides. The low cellular uptake of D-peptides remain an unmet challenge. So the best way is to insert some key D amino acids into the peptide sequence. For example, some pharmaceutical important peptide antibiotics such as gramicidins, actinomycins, or bacitracins incorporate D-amino acids into the drug design. The assemblies of D-peptides deserve further exploration and may lead to more surprises.
D amino acid peptide with high stability

D amino acid peptide with high stability

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