View source for 5cnx


==Crystal structure of Xaa-Pro aminopeptidase from Escherichia coli K12==
<StructureSection load='5cnx' size='340' side='right'caption='[[5cnx]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5cnx]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5CNX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5CNX 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]] 2.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CAC:CACODYLATE+ION'>CAC</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</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=5cnx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5cnx OCA], [https://pdbe.org/5cnx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5cnx RCSB], [https://www.ebi.ac.uk/pdbsum/5cnx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5cnx ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/YPDF_ECOLI YPDF_ECOLI] Hydrolyzes the N-terminal methionine when the next amino acid is alanine, proline or serine. The substrate preference for methionyl aminopeptidase activity is Pro > Ala > Ser. Also able to hydrolyze the Xaa-Pro peptide bond when the first amino acid is alanine, asparagine or methionine.<ref>PMID:15901689</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
M24B peptidases cleaving Xaa-Pro bond in dipeptides are prolidases whereas those cleaving this bond in longer peptides are aminopeptidases-P. Bacteria have small aminopeptidases-P (36-39 kDa), which are diverged from canonical aminopeptidase-P of Escherichia coli (50 kDa). Structure-function studies of small aminopeptidases-P are lacking. We report crystal structures of small aminopeptidases-P from E. coli and Deinococcus radiodurans, and report substrate-specificities of these proteins and their ortholog from Mycobacterium tuberculosis. These are aminopeptidases-P, structurally close to small prolidases except for absence of dipeptide-selectivity loop. We noticed absence of this loop and conserved arginine in canonical archaeal prolidase (Maher et al., Biochemistry. 43, 2004, 2771-2783) and questioned its classification. Our enzymatic assays show that this enzyme is an aminopeptidase-P. Further, our mutagenesis studies illuminate importance of DXRY sequence motif in bacterial small aminopeptidases-P and suggest common evolutionary origin with human XPNPEP1/XPNPEP2. Our analyses reveal sequence/structural features distinguishing small aminopeptidases-P from other M24B peptidases.

Structures and activities of widely conserved small prokaryotic aminopeptidases-P clarify classification of M24B peptidases.,Are VN, Kumar A, Goyal VD, Gotad SS, Ghosh B, Gadre R, Jamdar SN, Makde RD Proteins. 2018 Dec 11. doi: 10.1002/prot.25641. PMID:30536999<ref>PMID:30536999</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 5cnx" style="background-color:#fffaf0;"></div>

==See Also==
*[[Aminopeptidase 3D structures|Aminopeptidase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli K-12]]
[[Category: Large Structures]]
[[Category: Are V]]
[[Category: Ghosh B]]
[[Category: Jamdar S]]
[[Category: Kumar A]]
[[Category: Makde RD]]