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New page: left|200px<br /><applet load="1qhk" size="450" color="white" frame="true" align="right" spinBox="true" caption="1qhk" /> '''N-TERMINAL DOMAIN OF SACCHAROMYCES CEREVISIA...
 
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[[Image:1qhk.jpg|left|200px]]<br /><applet load="1qhk" size="450" color="white" frame="true" align="right" spinBox="true"
caption="1qhk" />
'''N-TERMINAL DOMAIN OF SACCHAROMYCES CEREVISIAE RNASE HI REVEALS A FOLD WITH A RESEMBLANCE TO THE N-TERMINAL DOMAIN OF RIBOSOMAL PROTEIN L9'''<br />


==Overview==
==N-TERMINAL DOMAIN OF SACCHAROMYCES CEREVISIAE RNASE HI REVEALS A FOLD WITH A RESEMBLANCE TO THE N-TERMINAL DOMAIN OF RIBOSOMAL PROTEIN L9==
In addition to the conserved and well-defined RNase H domain, eukaryotic, RNases HI possess either one or two copies of a small N-terminal domain., The solution structure of one of the N-terminal domains from Saccharomyces, cerevisiae RNase HI, determined using NMR spectroscopy, is presented. The, 46 residue motif comprises a three-stranded antiparallel beta-sheet and, two short alpha-helices which pack onto opposite faces of the beta-sheet., Conserved residues involved in packing the alpha-helices onto the, beta-sheet form the hydrophobic core of the domain. Three highly conserved, and solvent exposed residues are implicated in RNA binding, W22, K38 and, K39. The beta-beta-alpha-beta-alpha topology of the domain differs from, the structures of known RNA binding domains such as the double-stranded, RNA binding domain (dsRBD), the hnRNP K homology (KH) domain and the RNP, motif. However, structural similarities exist between this domain and the, N-terminal domain of ribosomal protein L9 which binds to 23 S ribosomal, RNA.
<StructureSection load='1qhk' size='340' side='right'caption='[[1qhk]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1qhk]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QHK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QHK FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=1qhk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qhk OCA], [https://pdbe.org/1qhk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qhk RCSB], [https://www.ebi.ac.uk/pdbsum/1qhk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qhk ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/RNH1_YEAST RNH1_YEAST] Endonuclease that specifically degrades the RNA of RNA-DNA hybrids.
== 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/qh/1qhk_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=1qhk ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
In addition to the conserved and well-defined RNase H domain, eukaryotic RNases HI possess either one or two copies of a small N-terminal domain. The solution structure of one of the N-terminal domains from Saccharomyces cerevisiae RNase HI, determined using NMR spectroscopy, is presented. The 46 residue motif comprises a three-stranded antiparallel beta-sheet and two short alpha-helices which pack onto opposite faces of the beta-sheet. Conserved residues involved in packing the alpha-helices onto the beta-sheet form the hydrophobic core of the domain. Three highly conserved and solvent exposed residues are implicated in RNA binding, W22, K38 and K39. The beta-beta-alpha-beta-alpha topology of the domain differs from the structures of known RNA binding domains such as the double-stranded RNA binding domain (dsRBD), the hnRNP K homology (KH) domain and the RNP motif. However, structural similarities exist between this domain and the N-terminal domain of ribosomal protein L9 which binds to 23 S ribosomal RNA.


==About this Structure==
NMR structure of the N-terminal domain of Saccharomyces cerevisiae RNase HI reveals a fold with a strong resemblance to the N-terminal domain of ribosomal protein L9.,Evans SP, Bycroft M J Mol Biol. 1999 Aug 20;291(3):661-9. PMID:10448044<ref>PMID:10448044</ref>
1QHK is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. 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=1QHK OCA].


==Reference==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
NMR structure of the N-terminal domain of Saccharomyces cerevisiae RNase HI reveals a fold with a strong resemblance to the N-terminal domain of ribosomal protein L9., Evans SP, Bycroft M, J Mol Biol. 1999 Aug 20;291(3):661-9. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10448044 10448044]
</div>
[[Category: Ribonuclease H]]
<div class="pdbe-citations 1qhk" style="background-color:#fffaf0;"></div>
 
==See Also==
*[[Ribonuclease 3D structures|Ribonuclease 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Single protein]]
[[Category: Bycroft M]]
[[Category: Bycroft, M.]]
[[Category: Evans SP]]
[[Category: Evans, S.P.]]
[[Category: ribonuclease hi n-terminal domain]]
 
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