1qsn
From Proteopedia
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|PDB= 1qsn |SIZE=350|CAPTION= <scene name='initialview01'>1qsn</scene>, resolution 2.20Å | |PDB= 1qsn |SIZE=350|CAPTION= <scene name='initialview01'>1qsn</scene>, resolution 2.20Å | ||
|SITE= | |SITE= | ||
| - | |LIGAND= <scene name='pdbligand=COA:COENZYME A'>COA</scene> | + | |LIGAND= <scene name='pdbligand=COA:COENZYME+A'>COA</scene> |
|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1qsn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qsn OCA], [http://www.ebi.ac.uk/pdbsum/1qsn PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1qsn RCSB]</span> | ||
}} | }} | ||
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[[Category: Trievel, R C.]] | [[Category: Trievel, R C.]] | ||
[[Category: Zhou, J.]] | [[Category: Zhou, J.]] | ||
| - | [[Category: COA]] | ||
[[Category: coa-binding protein]] | [[Category: coa-binding protein]] | ||
[[Category: gcn5-related n-acetyltransferase]] | [[Category: gcn5-related n-acetyltransferase]] | ||
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[[Category: ternary complex]] | [[Category: ternary complex]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 23:18:26 2008'' |
Revision as of 20:18, 30 March 2008
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| , resolution 2.20Å | |||||||
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| Ligands: | |||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
CRYSTAL STRUCTURE OF TETRAHYMENA GCN5 WITH BOUND COENZYME A AND HISTONE H3 PEPTIDE
Overview
Gene activation is a highly regulated process that requires the coordinated action of proteins to relieve chromatin repression and to promote transcriptional activation. Nuclear histone acetyltransferase (HAT) enzymes provide a mechanistic link between chromatin destabilization and gene activation by acetylating the epsilon-amino group of specific lysine residues within the aminoterminal tails of core histones to facilitate access to DNA by transcriptional activators. Here we report the high-resolution crystal structure of the HAT domain of Tetrahymena GCN5 (tGCN5) bound with both its physiologically relevant ligands, coenzyme A (CoA) and a histone H3 peptide, and the structures of nascent tGCN5 and a tGCN5/acetyl-CoA complex. Our structural data reveal histone-binding specificity for a random-coil structure containing a G-K-X-P recognition sequence, and show that CoA is essential for reorienting the enzyme for histone binding. Catalysis appears to involve water-mediated proton extraction from the substrate lysine by a glutamic acid general base and a backbone amide that stabilizes the transition-state reaction intermediate. Comparison with related N-acetyltransferases indicates a conserved structural framework for CoA binding and catalysis, and structural variability in regions associated with substrate-specific binding.
About this Structure
1QSN is a Protein complex structure of sequences from Saccharomyces cerevisiae and Tetrahymena thermophila. Full crystallographic information is available from OCA.
Reference
Structure of Tetrahymena GCN5 bound to coenzyme A and a histone H3 peptide., Rojas JR, Trievel RC, Zhou J, Mo Y, Li X, Berger SL, Allis CD, Marmorstein R, Nature. 1999 Sep 2;401(6748):93-8. PMID:10485713
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