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Protein & Peptide Letters

Editor-in-Chief

ISSN (Print): 0929-8665
ISSN (Online): 1875-5305

A Staggered Decameric Assembly of Human C-Reactive Protein Stabilized by Zinc Ions Revealed by X-ray Crystallography

Author(s): Christophe Guillon, Ulrick Mavoungou Bigouagou, Christelle Folio, Pascale Jeannin, Yves Delneste and Patrice Gouet

Volume 22 , Issue 3 , 2015

Page: [248 - 255] Pages: 8

DOI: 10.2174/0929866522666141231111226

Price: $65

Abstract

Human C-reactive protein (CRP) is an acute phase protein, which harbours both host defence and scavenging properties. In this study, we obtained two new crystal forms of CRP, where CRP forms a symmetric, staggered dimer of pentamers. In one of these structures, obtained in the presence of HIV-1 Tat protein, this dimer of pentamers is stabilized by two zinc ions trapped within a cleft of the effector face of CRP. These two decameric interfaces involve complementary surfaces of CRP pentamers and bury a large area of ~2000 Å2 per pentamer, suggesting a biological role of this interface. These two novel decameric interfaces and the involvement of zinc might have important consequences in the understanding of CRP biological functions.

Keywords: Acute phase, C-reactive protein, CRP, decamer, innate immunity, pentraxin, structure, X-ray crystallography, zinc.

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