1jrh: Difference between revisions
New page: left|200px<br /> <applet load="1jrh" size="450" color="white" frame="true" align="right" spinBox="true" caption="1jrh, resolution 2.8Å" /> '''COMPLEX (ANTIBODY/AN... |
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[[Image:1jrh.gif|left|200px]]<br /> | [[Image:1jrh.gif|left|200px]]<br /><applet load="1jrh" size="350" color="white" frame="true" align="right" spinBox="true" | ||
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caption="1jrh, resolution 2.8Å" /> | caption="1jrh, resolution 2.8Å" /> | ||
'''COMPLEX (ANTIBODY/ANTIGEN)'''<br /> | '''COMPLEX (ANTIBODY/ANTIGEN)'''<br /> | ||
==Overview== | ==Overview== | ||
The extracellular interferon gamma receptor alpha-chain comprises two | The extracellular interferon gamma receptor alpha-chain comprises two immunoglobulin-like domains, each with fibronectin type-III topology, which are responsible for binding interferon gamma at the cell surface. The epitopes on the human receptor recognized by three neutralizing antibodies, A6, gammaR38 and gammaR99, have been mapped by homolog scanning mutagenesis. In this way, a loop connecting beta-strands C and C' in the N-terminal domain was identified as a key component of the epitopes bound by A6 and gammaR38, whereas gammaR99 binds to the C-terminal domain in a region including strands A and B and part of the large C'E loop. The epitope for A6 was confirmed in a crystal structure of a complex between a recombinant N-terminal receptor domain and the Fab fragment from A6, determined by X-ray diffraction to 2.8 A resolution. The antibody-antigen interface buries 1662 A2 of protein surface, including 22 antibody residues from five complementarity determining regions, primarily through interactions with the CC' surface loop of the receptor. The floor of the antigen binding cavity is formed mainly by residues from CDR L3 and CDR H3 while a surrounding ridge is formed by residues from all other CDRs except L2. Many potential polar interactions, as well as 13 aromatic side-chains, four in VL, six in VH and three in the receptor, are situated at the interface. The surface of the receptor contacted by A6 overlaps to a large extent with that contacted by interferon-gamma, in the ligand-receptor complex. However, the conformation of this epitope is very different in the two complexes, demonstrating that conformational mobility in a surface loop on this cytokine receptor permits steric and electrostatic complementarity to two quite differently shaped binding sites.Copyright 1997 Academic Press Limited | ||
==Disease== | ==Disease== | ||
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==About this Structure== | ==About this Structure== | ||
1JRH is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http:// | 1JRH is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JRH OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Protein complex]] | [[Category: Protein complex]] | ||
[[Category: Sogabe, S.]] | [[Category: Sogabe, S.]] | ||
[[Category: Winkler, F | [[Category: Winkler, F K.]] | ||
[[Category: complex (antibody/antigen)]] | [[Category: complex (antibody/antigen)]] | ||
[[Category: cytokine receptor]] | [[Category: cytokine receptor]] | ||
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[[Category: transmembrane]] | [[Category: transmembrane]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:26:00 2008'' | ||
Revision as of 14:26, 21 February 2008
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COMPLEX (ANTIBODY/ANTIGEN)
OverviewOverview
The extracellular interferon gamma receptor alpha-chain comprises two immunoglobulin-like domains, each with fibronectin type-III topology, which are responsible for binding interferon gamma at the cell surface. The epitopes on the human receptor recognized by three neutralizing antibodies, A6, gammaR38 and gammaR99, have been mapped by homolog scanning mutagenesis. In this way, a loop connecting beta-strands C and C' in the N-terminal domain was identified as a key component of the epitopes bound by A6 and gammaR38, whereas gammaR99 binds to the C-terminal domain in a region including strands A and B and part of the large C'E loop. The epitope for A6 was confirmed in a crystal structure of a complex between a recombinant N-terminal receptor domain and the Fab fragment from A6, determined by X-ray diffraction to 2.8 A resolution. The antibody-antigen interface buries 1662 A2 of protein surface, including 22 antibody residues from five complementarity determining regions, primarily through interactions with the CC' surface loop of the receptor. The floor of the antigen binding cavity is formed mainly by residues from CDR L3 and CDR H3 while a surrounding ridge is formed by residues from all other CDRs except L2. Many potential polar interactions, as well as 13 aromatic side-chains, four in VL, six in VH and three in the receptor, are situated at the interface. The surface of the receptor contacted by A6 overlaps to a large extent with that contacted by interferon-gamma, in the ligand-receptor complex. However, the conformation of this epitope is very different in the two complexes, demonstrating that conformational mobility in a surface loop on this cytokine receptor permits steric and electrostatic complementarity to two quite differently shaped binding sites.Copyright 1997 Academic Press Limited
DiseaseDisease
Known diseases associated with this structure: BCG infection, generalized familial OMIM:[107470], H. pylori infection, susceptibility to OMIM:[107470], Mycobacterial infection, atypical, familial disseminated OMIM:[107470], Tuberculosis, susceptibility to OMIM:[107470]
About this StructureAbout this Structure
1JRH is a Protein complex structure of sequences from Homo sapiens and Mus musculus. Full crystallographic information is available from OCA.
ReferenceReference
Neutralizing epitopes on the extracellular interferon gamma receptor (IFNgammaR) alpha-chain characterized by homolog scanning mutagenesis and X-ray crystal structure of the A6 fab-IFNgammaR1-108 complex., Sogabe S, Stuart F, Henke C, Bridges A, Williams G, Birch A, Winkler FK, Robinson JA, J Mol Biol. 1997 Nov 7;273(4):882-97. PMID:9367779
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