View source for 4qpe


==Crystal structure of Aminopeptidase N in complex with N-cyclohexyl-1,2-diaminoethylphosphonic acid==
<StructureSection load='4qpe' size='340' side='right'caption='[[4qpe]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4qpe]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Neisseria_meningitidis_MC58 Neisseria meningitidis MC58]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4QPE OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4QPE 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]] 2.004&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=37E:[(1R)-1-AMINO-2-(CYCLOHEXYLAMINO)ETHYL]PHOSPHONIC+ACID'>37E</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</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=4qpe FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4qpe OCA], [https://pdbe.org/4qpe PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4qpe RCSB], [https://www.ebi.ac.uk/pdbsum/4qpe PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4qpe ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q9JYV4_NEIMB Q9JYV4_NEIMB] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Seven crystal structures of alanyl aminopeptidase from Neisseria meningitides (the etiological agent of meningitis, NmAPN) complexed with organophosphorus compounds were resolved to determine the optimal inhibitor-enzyme interactions. The enantiomeric phosphonic acid analogs of Leu and hPhe, which correspond to the P1 amino acid residues of well-processed substrates, were used to assess the impact of the absolute configuration and the stereospecific hydrogen bond network formed between the aminophosphonate polar head and the active site residues on the binding affinity. For the hPhe analog, an imperfect stereochemical complementarity could be overcome by incorporating an appropriate P1 side chain. The constitution of P1'-extended structures was rationally designed and the lead, phosphinic dipeptide hPhePpsi[CH2]Phe, was modified in a single position. Introducing a heteroatom/heteroatom-based fragment to either the P1 or P1' residue required new synthetic pathways. The compounds in the refined structure were low nanomolar and subnanomolar inhibitors of N. meningitides, porcine and human APNs, and the reference leucine aminopeptidase (LAP). The unnatural phosphinic dipeptide analogs exhibited a high affinity for monozinc APNs associated with a reasonable selectivity versus dizinc LAP. Another set of crystal structures containing the NmAPN dipeptide ligand were used to verify and to confirm the predicted binding modes; furthermore, novel contacts, which were promising for inhibitor development, were identified, including a pi-pi stacking interaction between a pyridine ring and Tyr372.

Structure-Guided, Single-Point Modifications in the Phosphinic Dipeptide Structure Yield Highly Potent and Selective Inhibitors of Neutral Aminopeptidases.,Vassiliou S, Weglarz-Tomczak E, Berlicki L, Pawelczak M, Nocek B, Mulligan R, Joachimiak A, Mucha A J Med Chem. 2014 Sep 22. PMID:25192493<ref>PMID:25192493</ref>

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

==See Also==
*[[Aminopeptidase 3D structures|Aminopeptidase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Neisseria meningitidis MC58]]
[[Category: Berlicki L]]
[[Category: Joachimiak A]]
[[Category: Mucha A]]
[[Category: Mulligan R]]
[[Category: Nocek B]]
[[Category: Vassilious S]]