1itv
From Proteopedia
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Dimeric form of the haemopexin domain of MMP9
Overview
Matrix metalloproteinase (MMPs) are critical for the degradation of, extracellular matrix components and, therefore, need to be regulated, tightly. Almost all MMPs share a homologous C-terminal haemopexin-like, domain (PEX). Besides its role in macromolecular substrate processing, the, PEX domains appear to play a major role in regulating MMP activation, localisation and inhibition. One intriguing property of MMP9 is its, competence to bind different proteins, involved in these regulatory, processes, with high affinity at an overlapping recognition site on its, PEX domain. With the crystal structure of the PEX9 dimer, we present the, first example of how PEX domains accomplish these diverse roles. Blade IV, of PEX9 mediates the non-covalent and predominantly hydrophobic, dimerisation contact. Large shifts of blade III and, in particular, blade, IV, accompany the dimerisation, resulting in a remarkably asymmetric, homodimeric structure. The asymmetry provides a novel mechanism of, adaptive protein recognition, where different proteins (PEX9, PEX1, and, TIMP1) can bind with high affinity to PEX9 at an overlapping site., Finally, the structure illustrates how the dimerisation generates new, properties on both a physico-chemical and functional level.
About this Structure
1ITV is a Single protein structure of sequence from Homo sapiens with SO4 as ligand. Active as Gelatinase B, with EC number 3.4.24.35 Full crystallographic information is available from OCA.
Reference
Structural basis of the adaptive molecular recognition by MMP9., Cha H, Kopetzki E, Huber R, Lanzendorfer M, Brandstetter H, J Mol Biol. 2002 Jul 26;320(5):1065-79. PMID:12126625
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