View source for 1nsa

==THREE-DIMENSIONAL STRUCTURE OF PORCINE PROCARBOXYPEPTIDASE B: A STRUCTURAL BASIS OF ITS INACTIVITY==
<StructureSection load='1nsa' size='340' side='right' caption='[[1nsa]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1nsa]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Sus_scrofa Sus scrofa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NSA OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1NSA FirstGlance]. <br>
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BEN:BENZAMIDINE'>BEN</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene><br>
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1nsa FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1nsa OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1nsa RCSB], [http://www.ebi.ac.uk/pdbsum/1nsa PDBsum]</span></td></tr>
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== 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/ns/1nsa_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/chain_selection.php?pdb_ID=2ata ConSurf].
<div style="clear:both"></div>
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== Publication Abstract from PubMed ==
Procarboxypeptidase B is converted to enzymatically active carboxypeptidase B by limited proteolysis catalysed by trypsin, removing the long N-terminal activation segment of 95 amino acids. The three-dimensional crystal structure of procarboxypeptidase B from porcine pancreas has been determined at 2.3 A resolution and refined to a crystallographic R-factor of 0.169. The functional determinants of its enzymatic inactivity and of its activation by limited proteolysis have thus been unveiled. The activation segment folds in a globular region with an open sandwich antiparallel-alpha antiparallel-beta topology and in a C terminal alpha-helix which connects it to the enzyme moiety. The globular region (A7-A82) shields the preformed active site, and establishes specific interactions with residues important for substrate recognition. AspA41 forms a salt bridge with Arg145, which in active carboxypeptidase binds the C-terminal carboxyl group of substrate molecules. The connecting region occupies the putative extended substrate binding site. The scissile peptide bond cleaved by trypsin during activation is very exposed. Its cleavage leads to the release of the activation segment and to exposure of the substrate binding site. An open-sandwich folding has been observed in a number of other proteins and protein domains. One of them is the C-terminal fragment of L7/L12, a ribosomal protein from Escherichia coli that displays a topology similar to the activation domain of procarboxypeptidase.

Three-dimensional structure of porcine procarboxypeptidase B: a structural basis of its inactivity.,Coll M, Guasch A, Aviles FX, Huber R EMBO J. 1991 Jan;10(1):1-9. PMID:1989878<ref>PMID:1989878</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Carboxypeptidase|Carboxypeptidase]]
*[[Homology modeling servers|Homology modeling servers]]
== References ==
<references/>
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</StructureSection>
[[Category: Sus scrofa]]
[[Category: Huber, R.]]
[[Category: Porcine procarboxypeptidase]]
[[Category: Serine protease]]