1ast: Difference between revisions
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==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]] 1.80Å' scene=''> | <StructureSection load='1ast' size='340' side='right'caption='[[1ast]], [[Resolution|resolution]] 1.80Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>[[1ast]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Astas Astas]. 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 [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1AST FirstGlance]. <br> | <table><tr><td colspan='2'>[[1ast]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Astas Astas]. 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 [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1AST FirstGlance]. <br> | ||
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Check<jmol> | Check<jmol> | ||
<jmolCheckbox> | <jmolCheckbox> | ||
<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/as/1ast_consurf.spt"</scriptWhenChecked> | <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/initialview01.spt</scriptWhenUnchecked> | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | ||
<text>to colour the structure by Evolutionary Conservation</text> | <text>to colour the structure by Evolutionary Conservation</text> | ||
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[[Category: Astacin]] | [[Category: Astacin]] | ||
[[Category: Astas]] | [[Category: Astas]] | ||
[[Category: Large Structures]] | |||
[[Category: Bode, W]] | [[Category: Bode, W]] | ||
[[Category: Gomis-Rueth, F X]] | [[Category: Gomis-Rueth, F X]] | ||
[[Category: Stoecker, W]] | [[Category: Stoecker, W]] | ||
Revision as of 10:04, 21 August 2019
STRUCTURE OF ASTACIN AND IMPLICATIONS FOR ACTIVATION OF ASTACINS AND ZINC-LIGATION OF COLLAGENASESSTRUCTURE OF ASTACIN AND IMPLICATIONS FOR ACTIVATION OF ASTACINS AND ZINC-LIGATION OF COLLAGENASES
Structural highlights
Function[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 Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedAstacin, 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. 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[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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