1kvc

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(New page: 200px<br /><applet load="1kvc" size="450" color="white" frame="true" align="right" spinBox="true" caption="1kvc, resolution 1.9&Aring;" /> '''E. COLI RIBONUCLEASE ...)
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[[Image:1kvc.jpg|left|200px]]<br /><applet load="1kvc" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1kvc, resolution 1.9&Aring;" />
 
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'''E. COLI RIBONUCLEASE HI D134N MUTANT'''<br />
 
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==Overview==
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==E. COLI RIBONUCLEASE HI D134N MUTANT==
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Three mutants of Escherichia coli ribonuclease HI, in which an invariant, acidic residue Asp134 was replaced, were crystallized, and their, three-dimensional structures were determined by X-ray crystallography. The, D134A mutant is completely inactive, whereas the other two mutants, D134H, and D134N, retain 59 and 90% activities relative to the wild-type, respectively. The overall structures of these three mutant proteins are, identical with that of the wild-type enzyme, except for local, conformational changes of the flexible loops. The ribonuclease H family, has a common active site, which is composed of four invariant acidic, residues (Asp10, Glu48, Asp70 and Asp134 in E.coli ribonuclease HI), and, their relative positions in the mutants, even including the side-chain, atoms, are almost the same as those in the wild-type. The positions of the, delta-polar atoms at residue 134 in the wild-type, as well as D134H and, D134N, coincide well with each other. They are located near the imidazole, side chain of His124, which is assumed to participate in the catalytic, reaction, in addition to the four invariant acidic residues. Combined with, the pH profiles of the enzymatic activities of the two other mutants, H124A and H124A/D134N, the crystallographic results allow us to propose a, new catalytic mechanism of ribonuclease H, which includes the roles for, Asp134 and His124.
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<StructureSection load='1kvc' size='340' side='right'caption='[[1kvc]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1kvc]] is a 1 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=1KVC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1KVC FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.9&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1kvc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1kvc OCA], [https://pdbe.org/1kvc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1kvc RCSB], [https://www.ebi.ac.uk/pdbsum/1kvc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1kvc ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/RNH_ECOLI RNH_ECOLI] Endonuclease that specifically degrades the RNA of RNA-DNA hybrids. RNase H participates in DNA replication; it helps to specify the origin of genomic replication by suppressing initiation at origins other than the oriC locus; along with the 5'-3' exonuclease of pol1, it removes RNA primers from the Okazaki fragments of lagging strand synthesis; and it defines the origin of replication for ColE1-type plasmids by specific cleavage of an RNA preprimer.[HAMAP-Rule:MF_00042]
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/kv/1kvc_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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=1kvc ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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1KVC is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Active as [http://en.wikipedia.org/wiki/Ribonuclease_H Ribonuclease H], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.26.4 3.1.26.4] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1KVC OCA].
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*[[Ribonuclease 3D structures|Ribonuclease 3D structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Proposal for new catalytic roles for two invariant residues in Escherichia coli ribonuclease HI., Kashiwagi T, Jeanteur D, Haruki M, Katayanagi K, Kanaya S, Morikawa K, Protein Eng. 1996 Oct;9(10):857-67. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=8931125 8931125]
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[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Ribonuclease H]]
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[[Category: Large Structures]]
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[[Category: Single protein]]
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[[Category: Haruki M]]
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[[Category: Haruki, M.]]
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[[Category: Jeanteur D]]
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[[Category: Jeanteur, D.]]
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[[Category: Kanaya S]]
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[[Category: Kanaya, S.]]
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[[Category: Kashiwagi T]]
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[[Category: Kashiwagi, T.]]
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[[Category: Katayanagi K]]
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[[Category: Katayanagi, K.]]
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[[Category: Morikawa K]]
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[[Category: Morikawa, K.]]
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[[Category: endoribonuclease]]
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[[Category: hydrolase]]
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[[Category: mutant]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 19:55:18 2007''
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Current revision

E. COLI RIBONUCLEASE HI D134N MUTANT

PDB ID 1kvc

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