View source for 2y59


==Unexpected tricovalent binding mode of boronic acids within the active site of a penicillin binding protein==
<StructureSection load='2y59' size='340' side='right'caption='[[2y59]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2y59]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Actinomadura_sp._R39 Actinomadura sp. R39]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2Y59 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2Y59 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]] 2.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=ZA3:TRIHYDROXY-[[(2-NITROPHENYL)CARBONYLAMINO]METHYL]BORON'>ZA3</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=2y59 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2y59 OCA], [https://pdbe.org/2y59 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2y59 RCSB], [https://www.ebi.ac.uk/pdbsum/2y59 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2y59 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/DAC_ACTSP DAC_ACTSP] Removes C-terminal D-alanyl residues from sugar-peptide cell wall precursors.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Boronic acids bearing appropriate side chains are good inhibitors of serine amidohydrolases. The boron usually adopts a tetrahedral conformation, bound to the nucleophilic serine of the active site and mimicking the transition state of the enzymatic reaction. We have solved the structures of complexes of a penicillin-binding protein, the DD-peptidase from Actinomadura sp. R39, with four amidomethylboronic acids (2,6-dimethoxybenzamidomethylboronic acid, phenylacetamidomethylboronic acid, 2-chlorobenzamidomethylboronic acid, and 2-nitrobenzamidomethylboronic acid) and the pinacol ester derived from phenylacetamidomethylboronic acid. We found that, in each case, the boron forms a tricovalent adduct with Ogamma of Ser49, Ser298, and the terminal amine group of Lys410, three key residues involved in the catalytic mechanism of penicillin-binding proteins. This represents the first tricovalent enzyme-inhibitor adducts observed by crystallography. In two of the five R39-boronate structures, the boronic acid is found as a tricovalent adduct in two monomers of the asymmetric unit and as a monocovalent adduct with the active serine in the two remaining monomers of the asymmetric unit. Formation of the tricovalent complex from a classical monocovalent complex may involve rotation around the Ser49 Calpha-Cbeta bond to place the boron in a position to interact with Ser298 and Lys410, and a twisting of the side-chain amide such that its carbonyl oxygen is able to hydrogen bond to the oxyanion hole NH of Thr413. Biphasic kinetics were observed in three of the five cases, and details of the reaction between R39 and 2,6-dimethoxybenzamidomethylboronic acid were studied. Observation of biphasic kinetics was not, however, thought to be correlated to formation of tricovalent complexes, assuming that the latter do form in solution. On the basis of the crystallographic and kinetic results, a reaction scheme for this unexpected inhibition by boronic acids is proposed.

Unexpected Tricovalent Binding Mode of Boronic Acids within the Active Site of a Penicillin-Binding Protein.,Zervosen A, Herman R, Kerff F, Herman A, Bouillez A, Prati F, Pratt RF, Frere JM, Joris B, Luxen A, Charlier P, Sauvage E J Am Chem Soc. 2011 Jul 20;133(28):10839-10848. Epub 2011 Jun 24. PMID:21574608<ref>PMID:21574608</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2y59" style="background-color:#fffaf0;"></div>

==See Also==
*[[Carboxypeptidase 3D structures|Carboxypeptidase 3D structures]]
*[[Penicillin-binding protein 3D structures|Penicillin-binding protein 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Actinomadura sp. R39]]
[[Category: Large Structures]]
[[Category: Charlier P]]
[[Category: Herman R]]
[[Category: Kerff F]]
[[Category: Rocaboy M]]
[[Category: Sauvage E]]
[[Category: Zervosen A]]