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1e3h

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[[Image:1e3h.jpg|left|200px]]<br /><applet load="1e3h" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1e3h, resolution 2.60&Aring;" />
 
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'''SEMET DERIVATIVE OF STREPTOMYCES ANTIBIOTICUS PNPASE/GPSI ENZYME'''<br />
 
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==Overview==
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==SeMet derivative of Streptomyces antibioticus PNPase/GPSI enzyme==
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BACKGROUND: Polynucleotide phosphorylase (PNPase) is a polyribonucleotide nucleotidyl transferase (E.C.2.7.7.8) that degrades mRNA in prokaryotes. Streptomyces antibioticus PNPase also assays as a guanosine 3'-diphosphate 5'-triphosphate (pppGpp) synthetase (E.C.2.7.6.5). It may function to coordinate changes in mRNA lifetimes with pppGpp levels during the Streptomyces lifecycle. RESULTS: The structure of S. antibioticus PNPase without bound RNA but with the phosphate analog tungstate bound at the PNPase catalytic sites was determined by X-ray crystallography and shows a trimeric multidomain protein with a central channel. The structural core has a novel duplicated architecture formed by association of two homologous domains. The tungstate derivative structure reveals the PNPase active site in the second of these core domains. Structure-based sequence analysis suggests that the pppGpp synthetase active site is located in the first core domain. CONCLUSIONS: This is the first structure of a PNPase and shows the structural basis for the trimer assembly, the arrangement of accessory RNA binding domains, and the likely catalytic residues of the PNPase active site. A possible function of the trimer channel is as a contribution to both the processivity of degradation and the regulation of PNPase action by RNA structural elements.
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<StructureSection load='1e3h' size='340' side='right'caption='[[1e3h]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1e3h]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptomyces_antibioticus Streptomyces antibioticus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1E3H OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1E3H 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]] 2.6&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></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=1e3h FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1e3h OCA], [https://pdbe.org/1e3h PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1e3h RCSB], [https://www.ebi.ac.uk/pdbsum/1e3h PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1e3h ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/PNP_STRAT PNP_STRAT] Involved in mRNA degradation. Catalyzes the phosphorolysis of single-stranded polyribonucleotides processively in the 3'- to 5'-direction.[HAMAP-Rule:MF_01595]
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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/e3/1e3h_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=1e3h 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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1E3H is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Streptomyces_antibioticus Streptomyces antibioticus] with <scene name='pdbligand=SO4:'>SO4</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1E3H 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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A duplicated fold is the structural basis for polynucleotide phosphorylase catalytic activity, processivity, and regulation., Symmons MF, Jones GH, Luisi BF, Structure. 2000 Nov 15;8(11):1215-26. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=11080643 11080643]
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[[Category: Large Structures]]
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[[Category: Single protein]]
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[[Category: Streptomyces antibioticus]]
[[Category: Streptomyces antibioticus]]
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[[Category: Jones, G H.]]
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[[Category: Jones GH]]
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[[Category: Luisi, B F.]]
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[[Category: Luisi BF]]
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[[Category: Symmons, M F.]]
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[[Category: Symmons MF]]
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[[Category: SO4]]
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[[Category: atp:gtp diphosphotransferase]]
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[[Category: polyribonucleotide transferase]]
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[[Category: rna degradation]]
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[[Category: rna processing]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:23:21 2008''
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Current revision

SeMet derivative of Streptomyces antibioticus PNPase/GPSI enzyme

PDB ID 1e3h

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