2ixf: Difference between revisions
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|PDB= 2ixf |SIZE=350|CAPTION= <scene name='initialview01'>2ixf</scene>, resolution 2.00Å | |PDB= 2ixf |SIZE=350|CAPTION= <scene name='initialview01'>2ixf</scene>, resolution 2.00Å | ||
|SITE= <scene name='pdbsite=AC1:Gol+Binding+Site+For+Chain+D'>AC1</scene> | |SITE= <scene name='pdbsite=AC1:Gol+Binding+Site+For+Chain+D'>AC1</scene> | ||
|LIGAND= <scene name='pdbligand= | |LIGAND= <scene name='pdbligand=ATP:ADENOSINE-5'-TRIPHOSPHATE'>ATP</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene> | ||
|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
|DOMAIN= | |||
|RELATEDENTRY= | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2ixf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ixf OCA], [http://www.ebi.ac.uk/pdbsum/2ixf PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2ixf RCSB]</span> | |||
}} | }} | ||
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[[Category: Ng, S L.]] | [[Category: Ng, S L.]] | ||
[[Category: Procko, E.]] | [[Category: Procko, E.]] | ||
[[Category: abc atpase]] | [[Category: abc atpase]] | ||
[[Category: atp-binding]] | [[Category: atp-binding]] | ||
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[[Category: transport]] | [[Category: transport]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 03:50:00 2008'' | ||
Revision as of 00:50, 31 March 2008
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| 2ixf, resolution 2.00Å | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sites: | AC1 | ||||||||||||
| Ligands: | ATP, GOL, MG | ||||||||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||||||
CRYSTAL STRUCTURE OF THE ATPASE DOMAIN OF TAP1 WITH ATP (D645Q, Q678H MUTANT)
Overview
The ABC transporter associated with antigen processing (TAP) shuttles cytosolic peptides into the endoplasmic reticulum for loading onto class I MHC molecules. Transport is fueled by ATP binding and hydrolysis at two distinct cytosolic ATPase sites. One site comprises consensus motifs shared among most ABC transporters, while the second has substituted, degenerate motifs. Biochemical and crystallography experiments with a TAP cytosolic domain demonstrate that the consensus ATPase site has high catalytic activity and facilitates ATP-dependent dimerization of the cytosolic domains, which is an important conformational change during transport. In contrast, the degenerate site is defective in dimerization and ATP hydrolysis. Full-length TAP mutagenesis demonstrates the necessity for at least one consensus site, supporting our conclusion that the consensus site is the principal facilitator of substrate transport. Since asymmetry of the ATPase site motifs is a feature of many mammalian homologs, our proposed model has broad implications for ABC transporters.
About this Structure
2IXF is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.
Reference
Distinct structural and functional properties of the ATPase sites in an asymmetric ABC transporter., Procko E, Ferrin-O'Connell I, Ng SL, Gaudet R, Mol Cell. 2006 Oct 6;24(1):51-62. PMID:17018292
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