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1kjm

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{{STRUCTURE_1kjm| PDB=1kjm | SCENE= }}
{{STRUCTURE_1kjm| PDB=1kjm | SCENE= }}
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'''TAP-A-associated rat MHC class I molecule'''
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===TAP-A-associated rat MHC class I molecule===
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==Overview==
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Antigenic peptides are loaded onto class I MHC molecules in the endoplasmic reticulum (ER) by a complex consisting of the MHC class I heavy chain, beta(2)-microglobulin, calreticulin, tapasin, Erp57 (ER60) and the transporter associated with antigen processing (TAP). While most mammalian species transport these peptides into the ER via a single allele of TAP, rats have evolved different TAPs, TAP-A and TAP-B, that are present in different inbred strains. Each TAP delivers a different spectrum of peptides and is associated genetically with distinct subsets of MHC class Ia alleles, but the molecular basis for the conservation (or co-evolution) of the two transporter alleles is unknown. We have determined the crystal structures of a representative of each MHC subset, viz RT1-A(a) and RT1-A1(c), in association with high-affinity nonamer peptides. The structures reveal how the chemical properties of the two different rat MHC F-pockets match those of the corresponding C termini of the peptides, corroborating biochemical data on the rates of peptide-MHC complex assembly. An unusual sequence in RT1-A1(c) leads to a major deviation from the highly conserved beta(3)/alpha(1) loop (residues 40-59) conformation in mouse and human MHC class I structures. This loop change contributes to profound changes in the shape of the A-pocket in the peptide-binding groove and may explain the function of RT1-A1(c) as an inhibitory natural killer cell ligand.
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(as it appears on PubMed at http://www.pubmed.gov), where 12470953 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12470953}}
==About this Structure==
==About this Structure==
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[[Category: Heterodimer]]
[[Category: Heterodimer]]
[[Category: Peptide-mhc complex]]
[[Category: Peptide-mhc complex]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 10:26:15 2008''

Revision as of 07:26, 2 July 2008

Image:1kjm.png

Template:STRUCTURE 1kjm

TAP-A-associated rat MHC class I molecule

Template:ABSTRACT PUBMED 12470953

About this Structure

1KJM is a Protein complex structure of sequences from Rattus norvegicus. Full crystallographic information is available from OCA.

Reference

Crystal structures of two rat MHC class Ia (RT1-A) molecules that are associated differentially with peptide transporter alleles TAP-A and TAP-B., Rudolph MG, Stevens J, Speir JA, Trowsdale J, Butcher GW, Joly E, Wilson IA, J Mol Biol. 2002 Dec 13;324(5):975-90. PMID:12470953

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