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[[Image:1ast.gif|left|200px]]
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{{STRUCTURE_1ast|  PDB=1ast  |  SCENE=  }}
'''STRUCTURE OF ASTACIN AND IMPLICATIONS FOR ACTIVATION OF ASTACINS AND ZINC-LIGATION OF COLLAGENASES'''


==STRUCTURE OF ASTACIN AND IMPLICATIONS FOR ACTIVATION OF ASTACINS AND ZINC-LIGATION OF COLLAGENASES==
<StructureSection load='1ast' size='340' side='right'caption='[[1ast]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1ast]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Astacus_astacus Astacus astacus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AST OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1AST 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=ZN:ZINC+ION'>ZN</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=1ast FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ast OCA], [https://pdbe.org/1ast PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ast RCSB], [https://www.ebi.ac.uk/pdbsum/1ast PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ast ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ASTA_ASTAS ASTA_ASTAS] This protease prefers to cleave in front of small aliphatic residues (P1'). The presence of Lys or Arg in the P1 and P2 position yields high-turnover substrates. In the P3 position the enzyme prefers Pro > Val > Leu > Ala > Gly.
== 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/as/1ast_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=1ast ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Astacin, a digestive zinc-endopeptidase from the crayfish Astacus astacus L., is the prototype for the 'astacin family', which includes mammalian metallo-endopeptidases and developmentally regulated proteins of man, fruitfly, frog and sea urchin. Here we report the X-ray crystal structure of astacin, which reveals a deep active-site cleft, with the zinc at its bottom ligated by three histidines, a water molecule and a more remote tyrosine. The third histidine (His 102) forms part of a consensus sequence, shared not only by the members of the astacin family, but also by otherwise sequentially unrelated proteinases, such as vertebrate collagenases. It may therefore represent the elusive 'third' zinc ligand in these enzymes. The amino terminus of astacin is buried forming an internal salt-bridge with Glu 103, adjacent to His 102. Astacin pro-forms extended at the N terminus, as observed for some 'latent' mammalian astacin homologues, did not exhibit this 'active' conformation, indicating an activation mechanism reminiscent of trypsin-like serine proteinases.


==Overview==
Structure of astacin and implications for activation of astacins and zinc-ligation of collagenases.,Bode W, Gomis-Ruth FX, Huber R, Zwilling R, Stocker W Nature. 1992 Jul 9;358(6382):164-7. PMID:1319561<ref>PMID:1319561</ref>
Astacin, a digestive zinc-endopeptidase from the crayfish Astacus astacus L., is the prototype for the 'astacin family', which includes mammalian metallo-endopeptidases and developmentally regulated proteins of man, fruitfly, frog and sea urchin. Here we report the X-ray crystal structure of astacin, which reveals a deep active-site cleft, with the zinc at its bottom ligated by three histidines, a water molecule and a more remote tyrosine. The third histidine (His 102) forms part of a consensus sequence, shared not only by the members of the astacin family, but also by otherwise sequentially unrelated proteinases, such as vertebrate collagenases. It may therefore represent the elusive 'third' zinc ligand in these enzymes. The amino terminus of astacin is buried forming an internal salt-bridge with Glu 103, adjacent to His 102. Astacin pro-forms extended at the N terminus, as observed for some 'latent' mammalian astacin homologues, did not exhibit this 'active' conformation, indicating an activation mechanism reminiscent of trypsin-like serine proteinases.


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
1AST is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Astacus_astacus Astacus astacus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AST OCA].
</div>
<div class="pdbe-citations 1ast" style="background-color:#fffaf0;"></div>


==Reference==
==See Also==
Structure of astacin and implications for activation of astacins and zinc-ligation of collagenases., Bode W, Gomis-Ruth FX, Huber R, Zwilling R, Stocker W, Nature. 1992 Jul 9;358(6382):164-7. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/1319561 1319561]
*[[Proteinase 3D structures|Proteinase 3D structures]]
[[Category: Astacin]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Astacus astacus]]
[[Category: Astacus astacus]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Bode, W.]]
[[Category: Bode W]]
[[Category: Gomis-Rueth, F X.]]
[[Category: Gomis-Rueth FX]]
[[Category: Stoecker, W.]]
[[Category: Stoecker W]]
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