1qyp: Difference between revisions
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|PDB= 1qyp |SIZE=350|CAPTION= <scene name='initialview01'>1qyp</scene> | |PDB= 1qyp |SIZE=350|CAPTION= <scene name='initialview01'>1qyp</scene> | ||
|SITE= | |SITE= | ||
|LIGAND= <scene name='pdbligand=ZN:ZINC ION'>ZN</scene> | |LIGAND= <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene> | ||
|ACTIVITY= | |ACTIVITY= | ||
|GENE= | |GENE= | ||
|DOMAIN= | |||
|RELATEDENTRY= | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1qyp FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qyp OCA], [http://www.ebi.ac.uk/pdbsum/1qyp PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1qyp RCSB]</span> | |||
}} | }} | ||
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[[Category: Wang, B.]] | [[Category: Wang, B.]] | ||
[[Category: Weiss, M A.]] | [[Category: Weiss, M A.]] | ||
[[Category: extremophile]] | [[Category: extremophile]] | ||
[[Category: hyperthermophilic]] | [[Category: hyperthermophilic]] | ||
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[[Category: zn ribbon]] | [[Category: zn ribbon]] | ||
''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 23:20:49 2008'' | ||
Revision as of 23:20, 30 March 2008
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
THERMOCOCCUS CELER RPB9, NMR, 25 STRUCTURES
OverviewOverview
BACKGROUND: Transcriptional initiation and elongation provide control points in gene expression. Eukaryotic RNA polymerase II subunit 9 (RPB9) regulates start-site selection and elongational arrest. RPB9 contains Cys4 Zn(2+)-binding motifs which are conserved in archaea and homologous to those of the general transcription factors TFIIB and TFIIS. RESULTS: The structure of an RPB9 domain from the hyperthermophilic archaeon Thermococcus celer was determined at high resolution by NMR spectroscopy. The structure consists of an apical tetrahedral Zn(2+)-binding site, central beta sheet and disordered loop. Although the structure lacks a globular hydrophobic core, the two surfaces of the beta sheet each contain well ordered aromatic rings engaged in serial edge-to-face interactions. Basic sidechains are clustered near the Zn(2+)-binding site. The disordered loop contains sidechains conserved in TFIIS, including acidic residues essential for the stimulation of transcriptional elongation. CONCLUSIONS: The planar architecture of the RPB9 zinc ribbon-distinct from that of a conventional globular domain-can accommodate significant differences in the alignment of polar, non-polar and charged sidechains. Such divergence is associated with local and non-local changes in structure. The RPB9 structure is distinguished by a fourth beta strand (extending the central beta sheet) in a well ordered N-terminal segment and also differs from TFIIS (but not TFIIB) in the orientation of its apical Zn(2+)-binding site. Cys4 Zn(2+)-binding sites with distinct patterns of polar, non-polar and charged residues are conserved among unrelated RNAP subunits and predicted to form variant zinc ribbons.
About this StructureAbout this Structure
1QYP is a Single protein structure of sequence from Thermococcus celer. Full crystallographic information is available from OCA.
ReferenceReference
High-resolution structure of an archaeal zinc ribbon defines a general architectural motif in eukaryotic RNA polymerases., Wang B, Jones DN, Kaine BP, Weiss MA, Structure. 1998 May 15;6(5):555-69. PMID:9634694
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