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[[Image:2ppb.gif|left|200px]]
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{{STRUCTURE_2ppb|  PDB=2ppb  |  SCENE=  }}
'''Crystal structure of the T. thermophilus RNAP polymerase elongation complex with the ntp substrate analog and antibiotic streptolydigin'''


==Crystal structure of the T. thermophilus RNAP polymerase elongation complex with the ntp substrate analog and antibiotic streptolydigin==
<StructureSection load='2ppb' size='340' side='right'caption='[[2ppb]], [[Resolution|resolution]] 3.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2ppb]] is a 16 chain structure with sequence from [https://en.wikipedia.org/wiki/Thermus_thermophilus_HB8 Thermus thermophilus HB8]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2PPB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2PPB FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=APC:DIPHOSPHOMETHYLPHOSPHONIC+ACID+ADENOSYL+ESTER'>APC</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=STD:STREPTOLYDIGIN'>STD</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2ppb FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2ppb OCA], [https://pdbe.org/2ppb PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2ppb RCSB], [https://www.ebi.ac.uk/pdbsum/2ppb PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2ppb ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RPOA_THET8 RPOA_THET8] DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates.
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/pp/2ppb_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2ppb ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The mechanism of substrate loading in multisubunit RNA polymerase is crucial for understanding the general principles of transcription yet remains hotly debated. Here we report the 3.0-A resolution structures of the Thermus thermophilus elongation complex (EC) with a non-hydrolysable substrate analogue, adenosine-5'-[(alpha,beta)-methyleno]-triphosphate (AMPcPP), and with AMPcPP plus the inhibitor streptolydigin. In the EC/AMPcPP structure, the substrate binds to the active ('insertion') site closed through refolding of the trigger loop (TL) into two alpha-helices. In contrast, the EC/AMPcPP/streptolydigin structure reveals an inactive ('preinsertion') substrate configuration stabilized by streptolydigin-induced displacement of the TL. Our structural and biochemical data suggest that refolding of the TL is vital for catalysis and have three main implications. First, despite differences in the details, the two-step preinsertion/insertion mechanism of substrate loading may be universal for all RNA polymerases. Second, freezing of the preinsertion state is an attractive target for the design of novel antibiotics. Last, the TL emerges as a prominent target whose refolding can be modulated by regulatory factors.


==Overview==
Structural basis for substrate loading in bacterial RNA polymerase.,Vassylyev DG, Vassylyeva MN, Zhang J, Palangat M, Artsimovitch I, Landick R Nature. 2007 Jul 12;448(7150):163-8. Epub 2007 Jun 20. PMID:17581591<ref>PMID:17581591</ref>
The mechanism of substrate loading in multisubunit RNA polymerase is crucial for understanding the general principles of transcription yet remains hotly debated. Here we report the 3.0-A resolution structures of the Thermus thermophilus elongation complex (EC) with a non-hydrolysable substrate analogue, adenosine-5'-[(alpha,beta)-methyleno]-triphosphate (AMPcPP), and with AMPcPP plus the inhibitor streptolydigin. In the EC/AMPcPP structure, the substrate binds to the active ('insertion') site closed through refolding of the trigger loop (TL) into two alpha-helices. In contrast, the EC/AMPcPP/streptolydigin structure reveals an inactive ('preinsertion') substrate configuration stabilized by streptolydigin-induced displacement of the TL. Our structural and biochemical data suggest that refolding of the TL is vital for catalysis and have three main implications. First, despite differences in the details, the two-step preinsertion/insertion mechanism of substrate loading may be universal for all RNA polymerases. Second, freezing of the preinsertion state is an attractive target for the design of novel antibiotics. Last, the TL emerges as a prominent target whose refolding can be modulated by regulatory factors.


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
2PPB is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Thermus_thermophilus Thermus thermophilus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2PPB OCA].
</div>
<div class="pdbe-citations 2ppb" style="background-color:#fffaf0;"></div>


==Reference==
==See Also==
Structural basis for substrate loading in bacterial RNA polymerase., Vassylyev DG, Vassylyeva MN, Zhang J, Palangat M, Artsimovitch I, Landick R, Nature. 2007 Jul 12;448(7150):163-8. Epub 2007 Jun 20. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17581591 17581591]
*[[RNA polymerase 3D structures|RNA polymerase 3D structures]]
[[Category: DNA-directed RNA polymerase]]
== References ==
[[Category: Protein complex]]
<references/>
[[Category: Thermus thermophilus]]
__TOC__
[[Category: Artsimovitch, I.]]
</StructureSection>
[[Category: Landick, R.]]
[[Category: Large Structures]]
[[Category: Vassylyev, D G.]]
[[Category: Thermus thermophilus HB8]]
[[Category: Vassylyeva, M N.]]
[[Category: Artsimovitch I]]
[[Category: Antibiotic streptolydigin]]
[[Category: Landick R]]
[[Category: Elongation complex]]
[[Category: Vassylyev DG]]
[[Category: Non-template dna]]
[[Category: Vassylyeva MN]]
[[Category: Ntp substrate]]
[[Category: Rna polymerase]]
[[Category: Rna transcript]]
[[Category: Template dna]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May  4 13:34:46 2008''
Retrieved from "https://proteopedia.org/2ppb"