6Q1U image
Entry Detail
PDB ID:
6Q1U
Keywords:
Title:
Structure of plasmin and peptide complex
Biological Source:
PDB Version:
Deposition Date:
2019-08-06
Release Date:
2020-04-15
Method Details:
Experimental Method:
Resolution:
2.35 Å
R-Value Free:
0.28
R-Value Work:
0.23
R-Value Observed:
0.23
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Plasminogen
Chain IDs:A, B
Chain Length:249
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:GLY-ARG-ALA-TYR-LYS-SER-LYS-PRO-PRO-ILE-ALA-PHE-PRO-ASP
Chain IDs:C, D
Chain Length:14
Number of Molecules:2
Biological Source:Helianthus annuus
Ligand Molecules
Primary Citation
Application and Structural Analysis of Triazole-Bridged Disulfide Mimetics in Cyclic Peptides.
Angew.Chem.Int.Ed.Engl. 59 11273 11277 (2020)
PMID: 32270580 DOI: 10.1002/anie.202003435

Abstact

Ruthenium-catalysed azide-alkyne cycloaddition (RuAAC) provides access to 1,5-disubstituted 1,2,3-triazole motifs in peptide engineering applications. However, investigation of this motif as a disulfide mimetic in cyclic peptides has been limited, and the structural consequences remain to be studied. We report synthetic strategies to install various triazole linkages into cyclic peptides through backbone cyclisation and RuAAC cross-linking reactions. These linkages were evaluated in four serine protease inhibitors based on sunflower trypsin inhibitor-1. NMR and X-ray crystallography revealed exceptional consensus of bridging distance and backbone conformations (RMSD<0.5 Å) of the triazole linkages compared to the parent disulfide molecules. The triazole-bridged peptides also displayed superior half-lives in liver S9 stability assays compared to disulfide-bridged peptides. This work establishes a foundation for the application of 1,5-disubstituted 1,2,3-triazoles as disulfide mimetics.

Legend

Protein

Chemical

Disease

Primary Citation of related structures