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New compstatin peptides containing N-terminal extensions and non-natural amino acids exhibit potent complement inhibition and improved solubility characteristics.

Abstract：

:Compstatin peptides are complement inhibitors that bind and inhibit cleavage of complement C3. Peptide binding is enhanced by hydrophobic interactions; however, poor solubility promotes aggregation in aqueous environments. We have designed new compstatin peptides derived from the W4A9 sequence (Ac-ICVWQDWGAHRCT-NH2, cyclized between C2 and C12), based on structural, computational, and experimental studies. Furthermore, we developed and utilized a computational framework for the design of peptides containing non-natural amino acids. These new compstatin peptides contain polar N-terminal extensions and non-natural amino acid substitutions at positions 4 and 9. Peptides with α-modified non-natural alanine analogs at position 9, as well as peptides containing only N-terminal polar extensions, exhibited similar activity compared to W4A9, as quantified via ELISA, hemolytic, and cell-based assays, and showed improved solubility, as measured by UV absorbance and reverse-phase HPLC experiments. Because of their potency and solubility, these peptides are promising candidates for therapeutic development in numerous complement-mediated diseases.

journal_name

J Med Chem

journal_title

Journal of medicinal chemistry

authors

Gorham RD Jr,Forest DL,Khoury GA,Smadbeck J,Beecher CN,Healy ED,Tamamis P,Archontis G,Larive CK,Floudas CA,Radeke MJ,Johnson LV,Morikis D

doi

10.1021/jm501345y

subject

Has Abstract

pub_date

2015-01-22 00:00:00

pages

814-26

issue

2

eissn

0022-2623

issn

1520-4804

journal_volume

58

pub_type

杂志文章

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