6BXP image
Entry Detail
PDB ID:
6BXP
Keywords:
Title:
Crystal Structure of HLA-B*57:01 with a modified HIV peptide RKV-Kyn
Biological Source:
PDB Version:
Deposition Date:
2017-12-18
Release Date:
2018-03-14
Method Details:
Experimental Method:
Resolution:
1.45 Å
R-Value Free:
0.19
R-Value Work:
0.16
R-Value Observed:
0.17
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:HLA class I histocompatibility antigen, B-57 alpha chain
Chain IDs:A
Chain Length:276
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Beta-2-microglobulin
Chain IDs:B
Chain Length:99
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:HIV peptide RKV-Kyn
Chain IDs:C
Chain Length:10
Number of Molecules:1
Biological Source:Human immunodeficiency virus 1
Ligand Molecules
Primary Citation
Identification of Native and Posttranslationally Modified HLA-B*57:01-Restricted HIV Envelope Derived Epitopes Using Immunoproteomics.
Proteomics 18 e1700253 e1700253 (2018)
PMID: 29437277 DOI: 10.1002/pmic.201700253

Abstact

The recognition of pathogen-derived peptides by T lymphocytes is the cornerstone of adaptive immunity, whereby intracellular antigens are degraded in the cytosol and short peptides assemble with class I human leukocyte antigen (HLA) molecules in the ER. These peptide-HLA complexes egress to the cell surface and are scrutinized by cytotoxic CD8+ T-cells leading to the eradication of the infected cell. Here, naturally presented HLA-B*57:01 bound peptides derived from the envelope protein of the human immunodeficiency virus (HIVenv) are identified. HIVenv peptides are present at a very small percentage of the overall HLA-B*57:01 peptidome (<0.1%) and both native and posttranslationally modified forms of two distinct HIV peptides are identified. Notably, a peptide bearing a natively encoded C-terminal tryptophan residue is also present in a modified form containing a kynurenine residue. Kynurenine is a major product of tryptophan catabolism and is abundant during inflammation and infection. Binding of these peptides at a molecular level and their immunogenicity in preliminary functional studies are examined. Modest immune responses are observed to the modified HIVenv peptide, highlighting a potential role for kynurenine-modified peptides in the immune response to HIV and other viral infections.

Legend

Protein

Chemical

Disease

Primary Citation of related structures