1q94
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| , resolution 2.4Å | |||||||
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| Gene: | HLA-A OR HLAA (Homo sapiens), B2M (Homo sapiens) | ||||||
| Related: | 1QVO
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Structures of HLA-A*1101 in complex with immunodominant nonamer and decamer HIV-1 epitopes clearly reveal the presence of a middle anchor residue
OverviewOverview
HLA-A*1101 is one of the most common human class I alleles worldwide. An increased frequency of HLA-A*1101 has been observed in cohorts of female sex workers from Northern Thailand who are highly exposed to HIV-1 and yet have remained persistently seronegative. In view of this apparent association of HLA-A*1101 with resistance to acquisition of HIV-1 infection, and given the importance of eliciting strong CTL responses to control and eliminate HIV-1, we have determined the crystal structure of HLA-A*1101 complexed with two immunodominant HIV-1 CTL epitopes: the nonamer reverse transcriptase(313-321) (AIFQSSMTK) and decamer Nef(73-82) (QVPLRPMTYK) peptides. The structures confirm the presence of primary anchor residues P2-Ile/-Val and P9-/P10-Lys, and also clearly reveal the presence of secondary anchor residues P6-Ser for reverse transcriptase and P7-Met for Nef. The overall backbone conformation of both peptides is defined as two bulges that are separated by a more buried middle residue. In this study, we discuss how this topology may offer functional advantages in the selection and presentation of HIV-1 CTL epitopes by HLA-A*1101. Overall, this structural analysis permits a more accurate definition of the peptide-binding motif of HLA-A*1101, the characterization of its antigenic surface, and the correlation of molecular determinants with resistance to HIV-1 infection. These studies are relevant for the rational design of HLA-A*1101-restricted CTL epitopes with improved binding and immunological properties for the development of HIV-1 vaccines.
DiseaseDisease
Known disease associated with this structure: Hypoproteinemia, hypercatabolic OMIM:[109700]
About this StructureAbout this Structure
1Q94 is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.
ReferenceReference
Structures of HLA-A*1101 complexed with immunodominant nonamer and decamer HIV-1 epitopes clearly reveal the presence of a middle, secondary anchor residue., Li L, Bouvier M, J Immunol. 2004 May 15;172(10):6175-84. PMID:15128805
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