2drw

<table><tr><td colspan='2'>[[2drw]] is a 6 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_49188 Atcc 49188]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=2d83 2d83]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2DRW OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2DRW FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BA:BARIUM+ION'>BA</scene></td></tr>

<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2dns|2dns]], [[3pte|3pte]], [[1ei5|1ei5]], [[1gce|1gce]]</td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2drw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2drw OCA], [http://pdbe.org/2drw PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2drw RCSB], [http://www.ebi.ac.uk/pdbsum/2drw PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2drw ProSAT]</span></td></tr>

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== Publication Abstract from PubMed ==

D-amino acid amidase (DAA) from Ochrobactrum anthropi SV3, which catalyzes the stereospecific hydrolysis of D-amino acid amides to yield the D-amino acid and ammonia, has attracted increasing attention as a catalyst for the stereospecific production of D-amino acids. In order to clarify the structure-function relationships of DAA, the crystal structures of native DAA, and of the D-phenylalanine/DAA complex, were determined at 2.1 and at 2.4 A resolution, respectively. Both crystals contain six subunits (A-F) in the asymmetric unit. The fold of DAA is similar to that of the penicillin-recognizing proteins, especially D-alanyl-D-alanine-carboxypeptidase from Streptomyces R61, and class C beta-lactamase from Enterobacter cloacae strain GC1. The catalytic residues of DAA and the nucleophilic water molecule for deacylation were assigned based on these structures. DAA has a flexible Omega-loop, similar to class C beta-lactamase. DAA forms a pseudo acyl-enzyme intermediate between Ser60 O(gamma) and the carbonyl moiety of d-phenylalanine in subunits A, B, C, D, and E, but not in subunit F. The difference between subunit F and the other subunits (A, B, C, D and E) might be attributed to the order/disorder structure of the Omega-loop: the structure of this loop cannot assigned in subunit F. Deacylation of subunit F may be facilitated by the relative movement of deprotonated His307 toward Tyr149. His307 N(epsilon2) extracts the proton from Tyr149 O(eta), then Tyr149 O(eta) attacks a nucleophilic water molecule as a general base. Gln214 on the Omega-loop is essential for forming a network of water molecules that contains the nucleophilic water needed for deacylation. Although peptidase activity is found in almost all penicillin-recognizing proteins, DAA lacks peptidase activity. The lack of transpeptidase and carboxypeptidase activities may be attributed to steric hindrance of the substrate-binding pocket by a loop comprised of residues 278-290 and the Omega-loop.

Crystal structure and functional characterization of a D-stereospecific amino acid amidase from Ochrobactrum anthropi SV3, a new member of the penicillin-recognizing proteins.,Okazaki S, Suzuki A, Komeda H, Yamaguchi S, Asano Y, Yamane T J Mol Biol. 2007 Apr 20;368(1):79-91. Epub 2006 Oct 26. PMID:17331533<ref>PMID:17331533</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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== References ==

<references/>

[[Category: Atcc 49188]]

[[Category: Asano, Y]]

[[Category: Komeda, H]]

[[Category: Okazaki, S]]

[[Category: Suzuki, A]]

[[Category: Yamane, T]]

[[Category: Penicillin recognizing protein]]