View source for 1cpx

==BETA FORM OF CARBOXYPEPTIDASE A (RESIDUES 3-307) FROM BOVINE PANCREAS IN AN ORTHORHOMBIC CRYSTAL FORM WITH TWO ZINC IONS IN THE ACTIVE SITE.==
<StructureSection load='1cpx' size='340' side='right' caption='[[1cpx]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1cpx]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CPX OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1CPX FirstGlance]. <br>
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=OH:HYDROXIDE+ION'>OH</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene><br>
<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Carboxypeptidase_A Carboxypeptidase A], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.17.1 3.4.17.1] </span></td></tr>
<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=1cpx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cpx OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1cpx RCSB], [http://www.ebi.ac.uk/pdbsum/1cpx PDBsum]</span></td></tr>
<table>
== 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/cp/1cpx_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 ==
Native carboxypeptidase A has been crystallized in a new crystal form, and the structure has been refined with X-ray data to 2.0 A resolution. In contrast to the previously published structure [Rees, D. C., Lewis, M., and Lipscomb, W. N. (1983) J. Mol. Biol. 168, 367-387], no active-site amino acids are involved in the crystal packing. The important Tyr248 is stabilized inside the active site by a hydrogen bond and by interactions with Ile247. The proposed role of Tyr248 in the induced fit mechanism is therefore not supported by the findings in this structure of native carboxypeptidase A. The structure has a partly populated inhibitory Zn2+ site in close proximity to the catalytic Zn2+ as evident from X-ray anomalous dispersion data. A hydroxo bridge is found between the catalytic Zn2+ and the inhibitory Zn2+ with a Zn2+-Zn2+ distance of 3.48 A. In addition, the inhibitory Zn2+ has Glu270 as a monodentate ligand. No other protein ligands to the inhibitory Zn2+ are seen. The crystals were grown at 0.3 M LiCl and weak evidence for a binding site for partly competitive inhibitory anions is observed.

Native carboxypeptidase A in a new crystal environment reveals a different conformation of the important tyrosine 248.,Bukrinsky JT, Bjerrum MJ, Kadziola A Biochemistry. 1998 Nov 24;37(47):16555-64. PMID:9843422<ref>PMID:9843422</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]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bos taurus]]
[[Category: Carboxypeptidase A]]
[[Category: Bjerrum, M J.]]
[[Category: Bukrinsky, J T.]]
[[Category: Kadziola, A.]]
[[Category: Carboxypeptidase]]
[[Category: Hydrolase]]
[[Category: Induced fit]]
[[Category: Metalloprotease]]
[[Category: Zinc inhibition]]