View source for 2pja


==CRYSTAL STRUCTURE OF ACTIVATED PORCINE PANCREATIC CARBOXYPEPTIDASE B 3-{[(R)-1-((S)-2-Benzyloxycarbonylamino-3-phenyl-propionylamino)-2-methyl-propyl]-hydroxy-phosphinoyl}-2-(3-guanidino-phenyl)-propionic acid COMPLEX==
<StructureSection load='2pja' size='340' side='right'caption='[[2pja]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2pja]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Sus_scrofa Sus scrofa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2PJA OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2PJA 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]] 1.7&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=33Z:(2S)-2-(3-{[AMINO(IMINO)METHYL]AMINO}PHENYL)-3-[(R)-[(1R)-1-({N-[(BENZYLOXY)CARBONYL]-L-PHENYLALANYL}AMINO)-2-METHYLPROPYL](HYDROXY)PHOSPHORYL]PROPANOIC+ACID'>33Z</scene>, <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=2pja FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2pja OCA], [https://pdbe.org/2pja PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2pja RCSB], [https://www.ebi.ac.uk/pdbsum/2pja PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2pja ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CBPB1_PIG CBPB1_PIG] 
== 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/pj/2pja_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=2pja ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
This article reports the crystal structures of inhibitors of the functional form of thrombin-activatable fibrinolysis inhibitor (TAFIa). In vivo experiments indicate that selective inhibitors of TAFIa would be useful in the treatment of heart attacks. Since TAFIa rapidly degrades in solution, the homologous protein porcine pancreatic carboxypeptidase B (pp-CpB) was used in these crystallography studies. Both TAFIa and pp-CpB are zinc-based exopeptidases that are specific for basic residues. The final development candidate, BX 528, is a potent inhibitor of TAFIa (2 nM) and has almost no measurable effect on the major selectivity target, carboxypeptidase N. BX 528 was designed to mimic the tripeptide Phe-Val-Lys. A sulfonamide replaces the Phe-Val amide bond and a phosphinate connects the Val and Lys groups. The phosphinate also chelates the active-site zinc. The electrostatic interactions with the protein mimic those of the natural substrate. The primary amine in BX 528 forms a salt bridge to Asp255 at the base of the S1' pocket. The carboxylic acid interacts with Arg145 and the sulfonamide is hydrogen bonded to Arg71. Isopropyl and phenyl groups replace the side chains of Val and Phe, respectively. A series of structures are presented here that illustrate the evolution of BX 528 from thiol-based inhibitors that mimic a free C-terminal arginine. The first step in development was the replacement of the thiol with a phosphinate. This caused a precipitous drop in binding affinity. Potency was reclaimed by extending the inhibitors into the downstream binding sites for the natural substrate.

Structures of potent selective peptide mimetics bound to carboxypeptidase B.,Adler M, Buckman B, Bryant J, Chang Z, Chu K, Emayan K, Hrvatin P, Islam I, Morser J, Sukovich D, West C, Yuan S, Whitlow M Acta Crystallogr D Biol Crystallogr. 2008 Feb;64(Pt 2):149-57. Epub 2008, Jan 16. PMID:18219114<ref>PMID:18219114</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2pja" style="background-color:#fffaf0;"></div>

==See Also==
*[[Carboxypeptidase 3D structures|Carboxypeptidase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Sus scrofa]]
[[Category: Adler M]]
[[Category: Whitlow M]]