View source for 1arm


==CARBOXYPEPTIDASE A WITH ZN REPLACED BY HG==
<StructureSection load='1arm' size='340' side='right'caption='[[1arm]], [[Resolution|resolution]] 1.76&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1arm]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ARM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1ARM 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]] 1.76&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CU:COPPER+(II)+ION'>CU</scene>, <scene name='pdbligand=HG:MERCURY+(II)+ION'>HG</scene>, <scene name='pdbligand=TRS:2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL'>TRS</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=1arm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1arm OCA], [https://pdbe.org/1arm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1arm RCSB], [https://www.ebi.ac.uk/pdbsum/1arm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1arm ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CBPA1_BOVIN CBPA1_BOVIN] Carboxypeptidase that catalyzes the release of a C-terminal amino acid, but has little or no action with -Asp, -Glu, -Arg, -Lys or -Pro (By similarity).
== 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/ar/1arm_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=1arm ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The crystal structure of the zinc-containing exopeptidase bovine carboxypeptidase A (CPA) has been refined to high resolution, based on a data set collected from a single crystal, incorporating new sequence information based on cloning of the bovine gene. In addition, new refined structures are available for the zinc-removed form of the enzyme, apo-CPA, as well as the mercury-replaced form, Hg-CPA. The native structure reveals that the zinc-bound water molecule does not appear to more loosely bound than the rest of the zinc ligands, at least when B-factor values are considered. Nor is there any evidence for a secondary location of this water molecule. The apo-enzyme structure does not show any density in the place of the removed zinc ion. The only significant change appears to be a chi2 rotation of one zinc histidine ligand to form an ion-pair interaction with a glutamic acid side chain. The structure of Hg-CPA reveals a solvent Tris molecule bound to the mercury cation, as well as an unidentified cation bound to Glu270. The location of this citation agrees with previous proposals for the binding side of inhibitory zinc. These observations may explain some of the differences in kinetics observed in metal- replaced CPA.

Carboxypeptidase A: native, zinc-removed and mercury-replaced forms.,Greenblatt HM, Feinberg H, Tucker PA, Shoham G Acta Crystallogr D Biol Crystallogr. 1998 May 1;54(Pt 3):289-305. PMID:9867434<ref>PMID:9867434</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1arm" style="background-color:#fffaf0;"></div>

==See Also==
*[[Carboxypeptidase 3D structures|Carboxypeptidase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bos taurus]]
[[Category: Large Structures]]
[[Category: Feinberg H]]
[[Category: Greenblatt HM]]
[[Category: Shoham G]]
[[Category: Tucker PA]]