View source for 1eqn


==E.COLI PRIMASE CATALYTIC CORE==
<StructureSection load='1eqn' size='340' side='right'caption='[[1eqn]], [[Resolution|resolution]] 2.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1eqn]] is a 5 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EQN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1EQN 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]] 2.9&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</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=1eqn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1eqn OCA], [https://pdbe.org/1eqn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1eqn RCSB], [https://www.ebi.ac.uk/pdbsum/1eqn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1eqn ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/DNAG_ECOLI DNAG_ECOLI] RNA polymerase that catalyzes the synthesis of short RNA molecules used as primers for DNA polymerase during DNA replication.[HAMAP-Rule:MF_00974]<ref>PMID:1511009</ref> <ref>PMID:340457</ref> 
== 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/eq/1eqn_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1eqn ConSurf].
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== Publication Abstract from PubMed ==
Primases synthesize short RNA strands on single-stranded DNA templates, thereby generating the hybrid duplexes required for the initiation of synthesis by DNA polymerases. We present the crystal structure of the catalytic unit of a primase enzyme, that of a approximately 320 residue fragment of Escherichia coli primase, determined at 2.9 A resolution. Central to the catalytic unit is a TOPRIM domain that is strikingly similar in its structure to that of corresponding domains in DNA topoisomerases, but is unrelated to the catalytic centers of other DNA or RNA polymerases. The catalytic domain of primase is crescent-shaped, and the concave face of the crescent is predicted to accommodate about 10 base-pairs of RNA-DNA duplex in a loose interaction, thereby limiting processivity.

A TOPRIM domain in the crystal structure of the catalytic core of Escherichia coli primase confirms a structural link to DNA topoisomerases.,Podobnik M, McInerney P, O'Donnell M, Kuriyan J J Mol Biol. 2000 Jul 7;300(2):353-62. PMID:10873470<ref>PMID:10873470</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1eqn" style="background-color:#fffaf0;"></div>

==See Also==
*[[RNA polymerase 3D structures|RNA polymerase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Large Structures]]
[[Category: Kuriyan J]]
[[Category: McInerney P]]
[[Category: O'Donnell M]]
[[Category: Podobnik M]]