View source for 4bd9


==Structure of the complex between SmCI and human carboxypeptidase A4==
<StructureSection load='4bd9' size='340' side='right'caption='[[4bd9]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4bd9]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Sabellastarte_magnifica Sabellastarte magnifica]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4BD9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4BD9 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]] 2.2&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><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=4bd9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4bd9 OCA], [https://pdbe.org/4bd9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4bd9 RCSB], [https://www.ebi.ac.uk/pdbsum/4bd9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4bd9 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CBPA4_HUMAN CBPA4_HUMAN] Metalloprotease that could be involved in the histone hyperacetylation pathway.<ref>PMID:10383164</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The crystal structure of SmCI (Sabellastarte magnifica carboxypeptidase inhibitor) has been determined in complex with human carboxypeptidase A4 (hCPA4). SmCI is composed by three BPTI/Kunitz domains, each one displaying high structural homology and functionality with serine protease inhibitors. Moreover, SmCI possesses a distinctive capability to inhibit metallo-carboxypeptidases, constituting a bifunctional metallocarboxy- and serine protease inhibitor. The structure of the 1:1 complex of SmCI with hCPA4 reveals a noncanonical mechanism of carboxypeptidase inhibition, which surprisingly occurs mainly via the N-terminal segment, which penetrates into the active site groove of the enzyme. Mutagenesis and biochemical analysis confirm the major role of the N-terminal segment in the inhibition of carboxypeptidases. SmCI represents a tri-Kunitz serine protease inhibitor adapted to inhibit metallo-carboxypeptidases and discloses an unusual mechanism of inhibition by the N-terminal segment, emulating the "classical" C-terminal substrate-like inhibition.

A Noncanonical Mechanism of Carboxypeptidase Inhibition Revealed by the Crystal Structure of the Tri-Kunitz SmCI in Complex with Human CPA4.,Alonso Del Rivero M, Reytor ML, Trejo SA, Chavez MA, Aviles FX, Reverter D Structure. 2013 Jul 2;21(7):1118-26. doi: 10.1016/j.str.2013.04.021. Epub 2013, Jun 6. PMID:23746805<ref>PMID:23746805</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4bd9" style="background-color:#fffaf0;"></div>

==See Also==
*[[Carboxypeptidase 3D structures|Carboxypeptidase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Sabellastarte magnifica]]
[[Category: Alonso-del-Ribero M]]
[[Category: Aviles FX]]
[[Category: Chavez MA]]
[[Category: Reverter D]]
[[Category: Reytor ML]]
[[Category: Trejo SA]]