1i3r: Difference between revisions
New page: left|200px<br /> <applet load="1i3r" size="450" color="white" frame="true" align="right" spinBox="true" caption="1i3r, resolution 2.4Å" /> '''CRYSTAL STRUCTURE OF... |
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[[Image:1i3r. | [[Image:1i3r.jpg|left|200px]]<br /><applet load="1i3r" size="350" color="white" frame="true" align="right" spinBox="true" | ||
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caption="1i3r, resolution 2.4Å" /> | caption="1i3r, resolution 2.4Å" /> | ||
'''CRYSTAL STRUCTURE OF A MUTANT IEK CLASS II MHC MOLECULE'''<br /> | '''CRYSTAL STRUCTURE OF A MUTANT IEK CLASS II MHC MOLECULE'''<br /> | ||
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==About this Structure== | ==About this Structure== | ||
1I3R is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus] with NAG and NDG as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http:// | 1I3R is a [http://en.wikipedia.org/wiki/Protein_complex Protein complex] structure of sequences from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus] with <scene name='pdbligand=NAG:'>NAG</scene> and <scene name='pdbligand=NDG:'>NDG</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1I3R OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: peptide]] | [[Category: peptide]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri Feb 15 15:59:27 2008'' | ||
Revision as of 16:59, 15 February 2008
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CRYSTAL STRUCTURE OF A MUTANT IEK CLASS II MHC MOLECULE
OverviewOverview
IE/DR MHC class II molecules have an extensive H-bonding network under the, bound peptide. In IE(k), two alpha chain acidic amino acids in the core of, this network were mutated to amides. At low pH, the mutant molecule, exchanged peptide much more rapidly than the wild-type. The crystal, structure of the mutant IE(k) revealed the loss of a single buried water, molecule and a reorganization of the predicted H-bonding network. We, suggest that these mutations enhance the transition of MHC class II to an, open conformation at low pH allowing the bound peptide to escape. In, wild-type IE(k), the need to protonate these amino acids also may be a, bottleneck in the return to a closed conformation after peptide binding.
About this StructureAbout this Structure
1I3R is a Protein complex structure of sequences from Mus musculus with and as ligands. Full crystallographic information is available from OCA.
ReferenceReference
Mutations changing the kinetics of class II MHC peptide exchange., Wilson N, Fremont D, Marrack P, Kappler J, Immunity. 2001 May;14(5):513-22. PMID:11371354
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