5VGD image
Entry Detail
PDB ID:
5VGD
Keywords:
Title:
Crystal Structure of HLA-C*0501 in complex with SAE
Biological Source:
PDB Version:
Deposition Date:
2017-04-11
Release Date:
2017-05-31
Method Details:
Experimental Method:
Resolution:
2.32 Å
R-Value Free:
0.29
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:HLA class I histocompatibility antigen, Cw-5 alpha chain
Chain IDs:A
Chain Length:277
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Beta-2-microglobulin
Chain IDs:B
Chain Length:100
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:SER-ALA-GLU-PRO-VAL-PRO-LEU-GLN-LEU
Chain IDs:C
Chain Length:9
Number of Molecules:1
Biological Source:Human immunodeficiency virus 1
Primary Citation
Structural and regulatory diversity shape HLA-C protein expression levels.
Nat Commun 8 15924 15924 (2017)
PMID: 28649982 DOI: 10.1038/ncomms15924

Abstact

Expression of HLA-C varies widely across individuals in an allele-specific manner. This variation in expression can influence efficacy of the immune response, as shown for infectious and autoimmune diseases. MicroRNA binding partially influences differential HLA-C expression, but the additional contributing factors have remained undetermined. Here we use functional and structural analyses to demonstrate that HLA-C expression is modulated not just at the RNA level, but also at the protein level. Specifically, we show that variation in exons 2 and 3, which encode the α1/α2 domains, drives differential expression of HLA-C allomorphs at the cell surface by influencing the structure of the peptide-binding cleft and the diversity of peptides bound by the HLA-C molecules. Together with a phylogenetic analysis, these results highlight the diversity and long-term balancing selection of regulatory factors that modulate HLA-C expression.

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