1xiw: Difference between revisions
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[[Image:1xiw.gif|left|200px]] | [[Image:1xiw.gif|left|200px]] | ||
'''Crystal structure of human CD3-e/d dimer in complex with a UCHT1 single-chain antibody fragment''' | {{Structure | ||
|PDB= 1xiw |SIZE=350|CAPTION= <scene name='initialview01'>1xiw</scene>, resolution 1.90Å | |||
|SITE= | |||
|LIGAND= | |||
|ACTIVITY= | |||
|GENE= CD3E, T3E ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens]), CD3D, T3D ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens]), UCHT1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10090 Mus musculus]) | |||
}} | |||
'''Crystal structure of human CD3-e/d dimer in complex with a UCHT1 single-chain antibody fragment''' | |||
==Overview== | ==Overview== | ||
The alpha/beta T cell receptor complex transmits signals from MHC/peptide antigens through a set of constitutively associated signaling molecules, including CD3-epsilon/gamma and CD3-epsilon/delta. We report the crystal structure at 1.9-A resolution of a complex between a human CD3-epsilon/delta ectodomain heterodimer and a single-chain fragment of the UCHT1 antibody. CD3-epsilon/delta and CD3-epsilon/gamma share a conserved interface between the Ig-fold ectodomains, with parallel packing of the two G strands. CD3-delta has a more electronegative surface and a more compact Ig fold than CD3-gamma; thus, the two CD3 heterodimers have distinctly different molecular surfaces. The UCHT1 antibody binds near an acidic region of CD3-epsilon opposite the dimer interface, occluding this region from direct interaction with the TCR. This immunodominant epitope may be a uniquely accessible surface in the TCR/CD3 complex, because there is overlap between the binding site of the UCHT1 and OKT3 antibodies. Determination of the CD3-epsilon/delta structure completes the set of TCR/CD3 globular ectodomains and contributes information about exposed CD3 surfaces. | The alpha/beta T cell receptor complex transmits signals from MHC/peptide antigens through a set of constitutively associated signaling molecules, including CD3-epsilon/gamma and CD3-epsilon/delta. We report the crystal structure at 1.9-A resolution of a complex between a human CD3-epsilon/delta ectodomain heterodimer and a single-chain fragment of the UCHT1 antibody. CD3-epsilon/delta and CD3-epsilon/gamma share a conserved interface between the Ig-fold ectodomains, with parallel packing of the two G strands. CD3-delta has a more electronegative surface and a more compact Ig fold than CD3-gamma; thus, the two CD3 heterodimers have distinctly different molecular surfaces. The UCHT1 antibody binds near an acidic region of CD3-epsilon opposite the dimer interface, occluding this region from direct interaction with the TCR. This immunodominant epitope may be a uniquely accessible surface in the TCR/CD3 complex, because there is overlap between the binding site of the UCHT1 and OKT3 antibodies. Determination of the CD3-epsilon/delta structure completes the set of TCR/CD3 globular ectodomains and contributes information about exposed CD3 surfaces. | ||
==About this Structure== | ==About this Structure== | ||
1XIW is a [ | 1XIW is a [[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=1XIW OCA]. | ||
==Reference== | ==Reference== | ||
Crystal structure of a human CD3-epsilon/delta dimer in complex with a UCHT1 single-chain antibody fragment., Arnett KL, Harrison SC, Wiley DC, Proc Natl Acad Sci U S A. 2004 Nov 16;101(46):16268-73. Epub 2004 Nov 8. PMID:[http:// | Crystal structure of a human CD3-epsilon/delta dimer in complex with a UCHT1 single-chain antibody fragment., Arnett KL, Harrison SC, Wiley DC, Proc Natl Acad Sci U S A. 2004 Nov 16;101(46):16268-73. Epub 2004 Nov 8. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15534202 15534202] | ||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: Mus musculus]] | [[Category: Mus musculus]] | ||
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[[Category: ucht1-scfv]] | [[Category: ucht1-scfv]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 15:10:29 2008'' | ||
Revision as of 16:10, 20 March 2008
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| , resolution 1.90Å | |||||||
|---|---|---|---|---|---|---|---|
| Gene: | CD3E, T3E (Homo sapiens), CD3D, T3D (Homo sapiens), UCHT1 (Mus musculus) | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystal structure of human CD3-e/d dimer in complex with a UCHT1 single-chain antibody fragment
OverviewOverview
The alpha/beta T cell receptor complex transmits signals from MHC/peptide antigens through a set of constitutively associated signaling molecules, including CD3-epsilon/gamma and CD3-epsilon/delta. We report the crystal structure at 1.9-A resolution of a complex between a human CD3-epsilon/delta ectodomain heterodimer and a single-chain fragment of the UCHT1 antibody. CD3-epsilon/delta and CD3-epsilon/gamma share a conserved interface between the Ig-fold ectodomains, with parallel packing of the two G strands. CD3-delta has a more electronegative surface and a more compact Ig fold than CD3-gamma; thus, the two CD3 heterodimers have distinctly different molecular surfaces. The UCHT1 antibody binds near an acidic region of CD3-epsilon opposite the dimer interface, occluding this region from direct interaction with the TCR. This immunodominant epitope may be a uniquely accessible surface in the TCR/CD3 complex, because there is overlap between the binding site of the UCHT1 and OKT3 antibodies. Determination of the CD3-epsilon/delta structure completes the set of TCR/CD3 globular ectodomains and contributes information about exposed CD3 surfaces.
About this StructureAbout this Structure
1XIW is a Protein complex structure of sequences from Homo sapiens and Mus musculus. Full crystallographic information is available from OCA.
ReferenceReference
Crystal structure of a human CD3-epsilon/delta dimer in complex with a UCHT1 single-chain antibody fragment., Arnett KL, Harrison SC, Wiley DC, Proc Natl Acad Sci U S A. 2004 Nov 16;101(46):16268-73. Epub 2004 Nov 8. PMID:15534202
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