1tmc
From Proteopedia
THE HTREE-DIMENSIONAL STRUCTURE OF A CLASS I MAJOR HISTOCOMPATIBILITY COMPLEX MOLECULE MISSING THE ALPHA3 DOMAIN OF THE HEAVY CHAIN
Overview
Class I major histocompatibility complex (MHC) molecules are ternary complexes of the soluble serum protein beta 2-microglobulin, MHC heavy chain, and bound peptide. The first two domains (alpha 1, alpha 2) of the heavy chain create the peptide binding cleft and the surface that contacts the T-cell receptor. The third domain (alpha 3) associates with the T-cell co-receptor, CD8, during T-cell recognition. Here we describe the x-ray crystal structure of a human class I MHC molecule, HLA-Aw68, from which the alpha 3 domain has been proteolytically removed. The resulting molecule shows no gross morphological changes compared to the intact protein. A decameric peptide complexed with the intact HLA-Aw68 is seen to bind to the proteolized molecule in the conventional manner, demonstrating that the alpha 3 domain is not required for the structural integrity of the molecule or for peptide binding.
About this Structure
1TMC is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.
Reference
The three-dimensional structure of a class I major histocompatibility complex molecule missing the alpha 3 domain of the heavy chain., Collins EJ, Garboczi DN, Karpusas MN, Wiley DC, Proc Natl Acad Sci U S A. 1995 Feb 14;92(4):1218-21. PMID:7862664 Page seeded by OCA on Sat May 3 10:07:33 2008
