View source for 2zxg


==Aminopeptidase N complexed with the aminophosphinic inhibitor of PL250, a transition state analogue==
<StructureSection load='2zxg' size='340' side='right'caption='[[2zxg]], [[Resolution|resolution]] 1.55&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2zxg]] is a 1 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=2ZXG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2ZXG 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]] 1.55&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=S23:N-{(2S)-3-[(1R)-1-AMINOETHYL](HYDROXY)PHOSPHORYL-2-BENZYLPROPANOYL}-L-PHENYLALANINE'>S23</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=2zxg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2zxg OCA], [https://pdbe.org/2zxg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2zxg RCSB], [https://www.ebi.ac.uk/pdbsum/2zxg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2zxg ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/AMPN_ECOLI AMPN_ECOLI] Aminopeptidase N is involved in the degradation of intracellular peptides generated by protein breakdown during normal growth as well as in response to nutrient starvation.
== 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/zx/2zxg_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/main_output.php?pdb_ID=2zxg ConSurf].
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== Publication Abstract from PubMed ==
Aminopeptidase N (APN; EC 3.4.11.2) purified from Escherichia coli has been crystallized with the optically pure aminophosphinic inhibitor PL250, H(3)N(+)-CH(CH(3))-P(O)(OH)-CH(2)-CH(CH(2)Ph)-CONH-CH(CH(2)Ph)CO(2)(-), which mimics the transition state of the hydrolysis reaction. PL250 inhibits APN with a K(i) of 1.5-2.2 nM and its three-dimensional structure in complex with E. coli APN showed its interaction with the S(1), S'(1) and S'(2) subsites of the catalytic site. In this structure, the Zn ion was shown to be pentacoordinated by His297, His301 and Glu320 of APN and the two O atoms of the phosphinic moiety of PL250. One of these O atoms is also involved in a hydrogen bond to Tyr381, supporting the proposed role of this amino acid in the stabilization of the transition state of the enzymatic process. The strength of the phosphinic zinc binding and the occupancy of the S'(2) subsite account for the 100-fold increase in affinity of PL250 compared with the dipeptide-derived inhibitor bestatin (K(i) = 4.1 x 10(-6) M). Accordingly, the removal of the C-terminal phenylalanine of PL250 resulted in a large decrease in affinity (K(i) = 2.17 x 10(-7) M). Furthermore, it was observed that the C-terminal carboxyl group of the inhibitor makes no direct interactions with the amino acids of the APN active site. Interestingly, PL250 exhibits the same inhibitory potency for E. coli APN and for mammalian enzymes, suggesting that the structure of the complex could be used as a template for the rational design of various human APN inhibitors needed to study the role of this aminopeptidase in various pathologies.

Structure of aminopeptidase N from Escherichia coli complexed with the transition-state analogue aminophosphinic inhibitor PL250.,Fournie-Zaluski MC, Poras H, Roques BP, Nakajima Y, Ito K, Yoshimoto T Acta Crystallogr D Biol Crystallogr. 2009 Aug;65(Pt 8):814-22. Epub 2009, Jul 17. PMID:19622865<ref>PMID:19622865</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 2zxg" 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: Ito K]]
[[Category: Nakajima Y]]
[[Category: Yoshimoto T]]