View source for 1jp7


==Crystal Structure of 5'-deoxy-5'-methylthioadenosine phosphorylase==
<StructureSection load='1jp7' size='340' side='right'caption='[[1jp7]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1jp7]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharolobus_solfataricus Saccharolobus solfataricus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JP7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1JP7 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]] 1.8&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=1jp7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1jp7 OCA], [https://pdbe.org/1jp7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1jp7 RCSB], [https://www.ebi.ac.uk/pdbsum/1jp7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1jp7 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PNPH_SACS2 PNPH_SACS2] Cleavage of guanosine or inosine to respective bases and sugar-1-phosphate molecules. Cleaves inosine, guanosine, and adenosine with a better efficiency than MTA.<ref>PMID:15819883</ref> <ref>PMID:7929153</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/jp/1jp7_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=1jp7 ConSurf].
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== Publication Abstract from PubMed ==
The structure of 5'-deoxy-5'-methylthioadenosine phosphorylase from Sulfolobus solfataricus (SsMTAP) has been determined alone, as ternary complexes with sulfate plus substrates 5'-deoxy-5'-methylthioadenosine, adenosine, or guanosine, or with the noncleavable substrate analog Formycin B and as binary complexes with phosphate or sulfate alone. The structure of unliganded SsMTAP was refined at 2.5-A resolution and the structures of the complexes were refined at resolutions ranging from 1.6 to 2.0 A. SsMTAP is unusual both for its broad substrate specificity and for its extreme thermal stability. The hexameric structure of SsMTAP is similar to that of purine-nucleoside phosphorylase (PNP) from Escherichia coli, however, only SsMTAP accepts 5'-deoxy-5'-methylthioadenosine as a substrate. The active site of SsMTAP is similar to that of E. coli PNP with 13 of 18 nearest residues being identical. The main differences are at Thr(89), which corresponds to serine in E. coli PNP, and Glu(163), which corresponds to proline in E. coli PNP. In addition, a water molecule is found near the purine N-7 position in the guanosine complex of SsMTAP. Thr(89) is near the 5'-position of the nucleoside and may account for the ability of SsMTAP to accept either hydrophobic or hydrophilic substituents in that position. Unlike E. coli PNP, the structures of SsMTAP reveal a substrate-induced conformational change involving Glu(163). This residue is located at the interface between subunits and swings in toward the active site upon nucleoside binding. The high-resolution structures of SsMTAP suggest that the transition state is stabilized in different ways for 6-amino versus 6-oxo substrates. SsMTAP has optimal activity at 120 degrees C and retains full activity after 2 h at 100 degrees C. Examination of the three-dimensional structure of SsMTAP suggests that unlike most thermophilic enzymes, disulfide linkages play a key in role in its thermal stability.

Three-dimensional structure of a hyperthermophilic 5'-deoxy-5'-methylthioadenosine phosphorylase from Sulfolobus solfataricus.,Appleby TC, Mathews II, Porcelli M, Cacciapuoti G, Ealick SE J Biol Chem. 2001 Oct 19;276(42):39232-42. Epub 2001 Aug 6. PMID:11489901<ref>PMID:11489901</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[5'-deoxy-5'-methylthioadenosine phosphorylase 3D structures|5'-deoxy-5'-methylthioadenosine phosphorylase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Saccharolobus solfataricus]]
[[Category: Appleby TC]]
[[Category: Cacciapuoti G]]
[[Category: Ealick SE]]
[[Category: Mathews II]]
[[Category: Porcelli M]]