1dyk
From Proteopedia
LAMININ ALPHA 2 CHAIN LG4-5 DOMAIN PAIR
Overview
The laminins are large heterotrimeric glycoproteins with fundamental roles in basement membrane architecture and function. The C-terminus of the laminin alpha chain contains a tandem of five laminin G-like (LG) domains. We report the 2.0 A crystal structure of the laminin alpha2 LG4-LG5 domain pair, which harbours binding sites for heparin and the cell surface receptor alpha-dystroglycan, and is 41% identical to the laminin alpha1 E3 fragment. LG4 and LG5 are arranged in a V-shaped fashion related by a 110 degrees rotation about an axis passing near the domain termini. An extended N-terminal segment is disulfide bonded to LG5 and stabilizes the domain pair. Two calcium ions, one each in LG4 and LG5, are located 65 A apart at the tips of the domains opposite the polypeptide termini. An extensive basic surface region between the calcium sites is proposed to bind alpha-dystroglycan and heparin. The LG4-LG5 structure was used to construct a model of the laminin LG1-LG5 tandem and interpret missense mutations underlying protein S deficiency.
About this Structure
1DYK is a Single protein structure of sequence from Mus musculus. Full crystallographic information is available from OCA.
Reference
Structure of the C-terminal laminin G-like domain pair of the laminin alpha2 chain harbouring binding sites for alpha-dystroglycan and heparin., Tisi D, Talts JF, Timpl R, Hohenester E, EMBO J. 2000 Apr 3;19(7):1432-40. PMID:10747011 Page seeded by OCA on Fri May 2 14:26:21 2008
