1gsm
From Proteopedia
A reassessment of the MAdCAM-1 structure and its role in integrin recognition.
Structural highlights
FunctionMADCA_HUMAN Cell adhesion leukocyte receptor expressed by mucosal venules, helps to direct lymphocyte traffic into mucosal tissues including the Peyer patches and the intestinal lamina propria. It can bind both integrin alpha-4/beta-7 and L-selectin, regulating both the passage and retention of leukocytes. Isoform 2, lacking the mucin-like domain, may be specialized in supporting integrin alpha-4/beta-7-dependent adhesion strengthening, independent of L-selectin binding. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedMucosal addressin cell-adhesion molecule (MAdCAM-1) is a membrane-bound leukocyte receptor regulating both the passage and retention of leukocytes in mucosal tissues. A crystal structure for the two extracellular amino-terminal domains of human MAdCAM-1 has previously been reported, confirming their expected immunoglobulin superfamily topology. In this study, a second crystal structure of this fragment is described. Although the overall structure is similar to that previously reported, one edge strand in the amino-terminal domain is instead located on the opposite sheet. This alters the arrangement and conformation of amino acids in this region that have previously been shown to be crucial for ligand binding. MAdCAM-1 is also seen to form dimers within the crystal lattice, raising the possibility that oligomerization may influence the biological role of this adhesion molecule. A reassessment of the MAdCAM-1 structure and its role in integrin recognition.,Dando J, Wilkinson KW, Ortlepp S, King DJ, Brady RL Acta Crystallogr D Biol Crystallogr. 2002 Feb;58(Pt 2):233-41. Epub 2002, Jan 24. PMID:11807247[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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