'''STRUCTURAL CONSEQUENCES OF A DISCONTINUITY IN THE REPEATING TRIPEPTIDE SEQUENCE OF A COLLAGEN-LIKE TRIPLE-HELICAL PEPTIDE'''
===STRUCTURAL CONSEQUENCES OF A DISCONTINUITY IN THE REPEATING TRIPEPTIDE SEQUENCE OF A COLLAGEN-LIKE TRIPLE-HELICAL PEPTIDE===
==Overview==
<!--
The collagen model peptide with sequence (Pro-Hyp-Gly)4-Pro-Gly-(Pro-Hyp-Gly)5 contains a central Gly-Pro-Gly interruption in the consensus collagen sequence. Its high-resolution crystal structure defines the molecular consequences of such an interruption for the collagen triple-helical conformation, and provides insight into possible structural and biological roles of similar interruptions in the -Gly-X-Y- repeating pattern found in non-fibrillar collagens. The peptide (denoted as the Hyp minus peptide or Hyp-) forms a rod-like triple helix structure without any bend or kink, and crystallizes in a quasi-hexagonal lattice. The two Pro-Hyp-Gly zones adopt the typical triple-helical collagen conformation with standard Rich and Crick II hydrogen bonding topology. Notably, the central zone containing the Gly-Pro-Gly interruption deviates from the standard structure in terms of hydrogen bonding topology, torsion angles, helical, and superhelical parameters. These deviations are highly localized, such that the standard features are regained within one to two residues on either side. Conformational variations and high temperature factors seen for the six chains of the asymmetric unit in the zone around the interruption point to the presence of a local region of considerable plasticity and flexibility embedded within two highly rigid and ordered standard triple-helical segments. The structure suggests a role for Gly-X-Gly interruptions as defining regions of flexibility and molecular recognition in the otherwise relatively uniform repeating collagen conformation.
The line below this paragraph, {{ABSTRACT_PUBMED_16919298}}, adds the Publication Abstract to the page
(as it appears on PubMed at http://www.pubmed.gov), where 16919298 is the PubMed ID number.
-->
{{ABSTRACT_PUBMED_16919298}}
==About this Structure==
==About this Structure==
Line 24:
Line 28:
[[Category: Collagen-like peptide]]
[[Category: Collagen-like peptide]]
[[Category: Triple helix]]
[[Category: Triple helix]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 15:07:59 2008''
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 00:44:34 2008''
Revision as of 00:44, 1 July 2008
This article has been automatically seeded. Changes to this page should pertain to the PDB entry only and not to the protein or biomolecule in general.
STRUCTURAL CONSEQUENCES OF A DISCONTINUITY IN THE REPEATING TRIPEPTIDE SEQUENCE OF A COLLAGEN-LIKE TRIPLE-HELICAL PEPTIDESTRUCTURAL CONSEQUENCES OF A DISCONTINUITY IN THE REPEATING TRIPEPTIDE SEQUENCE OF A COLLAGEN-LIKE TRIPLE-HELICAL PEPTIDE
