View source for 1e28

[[Image:1e28.gif|left|200px]]

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{{STRUCTURE_1e28|  PDB=1e28  |  SCENE=  }} 

'''NONSTANDARD PEPTIDE BINDING OF HLA-B*5101 COMPLEXED WITH HIV IMMUNODOMINANT EPITOPE KM2(TAFTIPSI)'''


==Overview==
The crystal structures of the human MHC class I allele HLA-B*5101 in complex with 8-mer, TAFTIPSI, and 9-mer, LPPVVAKEI, immunodominant peptide epitopes from HIV-1 have been determined by x-ray crystallography. In both complexes, the hydrogen-bonding network in the N-terminal anchor (P1) pocket is rearranged as a result of the replacement of the standard tyrosine with histidine at position 171. This results in a nonstandard positioning of the peptide N terminus, which is recognized by B*5101-restricted T cell clones. Unexpectedly, the P5 peptide residues appear to act as anchors, drawing the peptides unusually deeply into the peptide-binding groove of B51. The unique characteristics of P1 and P5 are likely to be responsible for the zig-zag conformation of the 9-mer peptide and the slow assembly of B*5101. A comparison of the surface characteristics in the alpha1-helix C-terminal region for B51 and other MHC class I alleles highlights mainly electrostatic differences that may be important in determining the specificity of human killer cell Ig-like receptor binding.

==About this Structure==
1E28 is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [http://en.wikipedia.org/wiki/Human_immunodeficiency_virus_1 Human immunodeficiency virus 1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1E28 OCA]. 

==Reference==
Nonstandard peptide binding revealed by crystal structures of HLA-B*5101 complexed with HIV immunodominant epitopes., Maenaka K, Maenaka T, Tomiyama H, Takiguchi M, Stuart DI, Jones EY, J Immunol. 2000 Sep 15;165(6):3260-7. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10975842 10975842]
[[Category: Homo sapiens]]
[[Category: Human immunodeficiency virus 1]]
[[Category: Protein complex]]
[[Category: Jones, E Y.]]
[[Category: Maenaka, K.]]
[[Category: Maenaka, T.]]
[[Category: Stuart, D I.]]
[[Category: Takiguchi, M.]]
[[Category: Tomiyama, H.]]
[[Category: Histocompatibility complex]]
[[Category: Hiv]]
[[Category: Hla b51]]
[[Category: Mhc class i]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 14:34:02 2008''