Conformational resemblance between the structures of integrin-activating pentapetides derived from βig-h3 and RGD peptide analogues in a membrane environment

Sung Jean Park, Sangho Park, Hee Chul Ahn, In-San Kim, Bong Jin Lee

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The peptides NKDIL and EPDIM, respectively derived from the 2nd and 4th domains of βig-h3, were fully active in mediating cell adhesion through interactions with α3β1 integrin [Biochem. Biophys. Res. Commun. 294 (2002) 940; J. Biol. Chem. 275 (2000) 30907]. Here, the conformational differences between NKDIL and EPDIM in water and in membrane environments were studied using CD spectroscopy, and their structures in sodium dodecylsulfate micelles were determined by NMR. The two peptides adopt β-turn structures like RGD peptides, and have more regular structures in micelles than in aqueous buffers. EPDIM shows a distorted type I β-turn for the PDIM segment in a membrane environment. The structure of NKDIL is similar with the standard type I′ β-turn, but shows large backbone flexibility even in a membrane environment. The conformational change of the 4th repeated domain of βig-h3 in micelle solutions suggests that the Asp-Ile motif of the 4th fas-1 domain (EPDIM) would be solvent-exposed and could interact with integrin α3β1 in a membrane environment. The present study provides a structural basis of βig-h3 function and information for the development of integrin-regulating drugs involving the wound healing protein.

Original languageEnglish
Pages (from-to)199-205
Number of pages7
JournalPeptides
Volume25
Issue number2
DOIs
Publication statusPublished - 2004 Feb 1
Externally publishedYes

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Keywords

  • βig-h3
  • CD
  • EPDIM
  • Membrane-binding
  • NKDIL
  • NMR

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Endocrinology
  • Cellular and Molecular Neuroscience

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