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| {{STRUCTURE_1ac6| PDB=1ac6 | SCENE= }} | | {{STRUCTURE_1ac6| PDB=1ac6 | SCENE= }} |
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| '''CRYSTAL STRUCTURE OF A VARIABLE DOMAIN MUTANT OF A T-CELL RECEPTOR ALPHA CHAIN'''
| | ===CRYSTAL STRUCTURE OF A VARIABLE DOMAIN MUTANT OF A T-CELL RECEPTOR ALPHA CHAIN=== |
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| ==Overview==
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| The crystal structure of a mutant T cell receptor (TCR) V alpha domain containing a grafted third complementarity-determining region (CDR3) from a different V alpha was determined at 2.3 A resolution by molecular replacement using the wild-type V alpha structure as a search model. Like the wild-type V alpha domain, the mutant crystallized as a homodimer very similar to TCR V alpha V beta and antibody V(L)V(H) heterodimers, with the CDR loops disposed to form part of the antigen-binding site. However, the relative orientation of the two chains in the mutant V alpha homodimer differs from that in the wild-type by a rotation of 14 degrees such that the buried surface area in the dimer interface of the mutant is 140 A2 less than in the wild-type. While the residues forming the interface are essentially the same in the two structures, there are only four pairs of interface hydrogen bonds in the case of the mutant compared with eight for the wild-type. These results suggest that multiple relative orientations of the V alpha and V beta domains of TCRs may be possible, providing a significant contribution to TCR combining site diversity. | | The line below this paragraph, {{ABSTRACT_PUBMED_9199407}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 9199407 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_9199407}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Three-dimensional structure]] | | [[Category: Three-dimensional structure]] |
| [[Category: V alpha domain]] | | [[Category: V alpha domain]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 10:05:34 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 16:34:00 2008'' |
