1s77

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[[Image:1s77.gif|left|200px]]
[[Image:1s77.gif|left|200px]]
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{{Structure
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<!--
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|PDB= 1s77 |SIZE=350|CAPTION= <scene name='initialview01'>1s77</scene>, resolution 2.69&Aring;
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The line below this paragraph, containing "STRUCTURE_1s77", creates the "Structure Box" on the page.
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|SITE=
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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|LIGAND= <scene name='pdbligand=3DA:3&#39;-DEOXYADENOSINE-5&#39;-MONOPHOSPHATE'>3DA</scene>, <scene name='pdbligand=A:ADENOSINE-5&#39;-MONOPHOSPHATE'>A</scene>, <scene name='pdbligand=C:CYTIDINE-5&#39;-MONOPHOSPHATE'>C</scene>, <scene name='pdbligand=DA:2&#39;-DEOXYADENOSINE-5&#39;-MONOPHOSPHATE'>DA</scene>, <scene name='pdbligand=DC:2&#39;-DEOXYCYTIDINE-5&#39;-MONOPHOSPHATE'>DC</scene>, <scene name='pdbligand=DG:2&#39;-DEOXYGUANOSINE-5&#39;-MONOPHOSPHATE'>DG</scene>, <scene name='pdbligand=DT:THYMIDINE-5&#39;-MONOPHOSPHATE'>DT</scene>, <scene name='pdbligand=G:GUANOSINE-5&#39;-MONOPHOSPHATE'>G</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=POP:PYROPHOSPHATE+2-'>POP</scene>
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/DNA-directed_RNA_polymerase DNA-directed RNA polymerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.6 2.7.7.6] </span>
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or leave the SCENE parameter empty for the default display.
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|GENE= 1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10760 Enterobacteria phage T7])
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-->
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|DOMAIN=
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{{STRUCTURE_1s77| PDB=1s77 | SCENE= }}
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|RELATEDENTRY=
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1s77 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1s77 OCA], [http://www.ebi.ac.uk/pdbsum/1s77 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1s77 RCSB]</span>
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}}
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'''T7 RNAP product pyrophosphate elongation complex'''
'''T7 RNAP product pyrophosphate elongation complex'''
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[[Category: Steitz, T A.]]
[[Category: Steitz, T A.]]
[[Category: Yin, Y W.]]
[[Category: Yin, Y W.]]
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[[Category: t7 rna polymerase]]
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[[Category: T7 rna polymerase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 08:23:00 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 23:38:21 2008''
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Revision as of 05:23, 3 May 2008

Image:1s77.gif

Template:STRUCTURE 1s77

T7 RNAP product pyrophosphate elongation complex


Overview

RNA polymerase functions like a molecular motor that can convert chemical energy into the work of strand separation and translocation along the DNA during transcription. The structures of phage T7 RNA polymerase in an elongation phase substrate complex that includes the incoming nucleoside triphosphate and a pretranslocation product complex that includes the product pyrophosphate (PPi) are described here. These structures and the previously determined posttranslocation elongation complex demonstrate that two enzyme conformations exist during a cycle of single nucleotide addition. One orientation of a five-helix subdomain is stabilized by the phosphates of either the incoming NTP or by the product PPi. A second orientation of this subdomain is stable in their absence and is associated with translocation of the heteroduplex product as well as strand separation of the downstream DNA. We propose that the dissociation of the product PPi after nucleotide addition produces the protein conformational change resulting in translocation and strand separation.

About this Structure

1S77 is a Single protein structure of sequence from Enterobacteria phage t7. Full crystallographic information is available from OCA.

Reference

The structural mechanism of translocation and helicase activity in T7 RNA polymerase., Yin YW, Steitz TA, Cell. 2004 Feb 6;116(3):393-404. PMID:15016374 Page seeded by OCA on Sat May 3 08:23:00 2008

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OCA

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