1q15

<table><tr><td colspan='2'>[[1q15]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_carotovorus"_jones_1901 "bacillus carotovorus" jones 1901]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1Q15 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1Q15 FirstGlance]. <br>

</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1q19|1q19]]</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=1q15 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1q15 OCA], [http://pdbe.org/1q15 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1q15 RCSB], [http://www.ebi.ac.uk/pdbsum/1q15 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1q15 ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/CARA_PECCA CARA_PECCA]] Involved in the biosynthesis of carbapenam-3-carboxylate, a beta-lactam antibiotic of the carbapenem class. Catalyzes the ATP-dependent formation of (3S,5S)-carbapenam-3-carboxylate from (2S,5S)-5-carboxymethylproline.<ref>PMID:12820893</ref> <ref>PMID:17658887</ref> <ref>PMID:19371088</ref>

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== Publication Abstract from PubMed ==

Carbapenam synthetase (CarA) is an ATP/Mg2+-dependent enzyme that catalyzes formation of the beta-lactam ring in (5R)-carbapenem-3-carboxylic acid biosynthesis. CarA is homologous to beta-lactam synthetase (beta-LS), which is involved in clavulanic acid biosynthesis. The catalytic cycles of CarA and beta-LS mediate substrate adenylation followed by beta-lactamization via a tetrahedral intermediate or transition state. Another member of this family of ATP/Mg2+-dependent enzymes, asparagine synthetase (AS-B), catalyzes intermolecular, rather than intramolecular, amide bond formation in asparagine biosynthesis. The crystal structures of apo-CarA and CarA complexed with the substrate (2S,5S)-5-carboxymethylproline (CMPr), ATP analog alpha,beta-methyleneadenosine 5'-triphosphate (AMP-CPP), and a single Mg2+ ion have been determined. CarA forms a tetramer. Each monomer resembles beta-LS and AS-B in overall fold, but key differences are observed. The N-terminal domain lacks the glutaminase active site found in AS-B, and an extended loop region not observed in beta-LS or AS-B is present. Comparison of the C-terminal synthetase active site to that in beta-LS reveals that the ATP binding site is highly conserved. By contrast, variations in the substrate binding pocket reflect the different substrates of the two enzymes. The Mg2+ coordination is also different. Several key residues in the active site are conserved between CarA and beta-LS, supporting proposed roles in beta-lactam formation. These data provide further insight into the structures of this class of enzymes and suggest that CarA might be a versatile target for protein engineering experiments aimed at developing improved production methods and new carbapenem antibiotics.

Crystal structure of carbapenam synthetase (CarA).,Miller MT, Gerratana B, Stapon A, Townsend CA, Rosenzweig AC J Biol Chem. 2003 Oct 17;278(42):40996-1002. Epub 2003 Jul 30. PMID:12890666<ref>PMID:12890666</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 1q15" style="background-color:#fffaf0;"></div>

[[Category: Bacillus carotovorus jones 1901]]

[[Category: Gerratana, B]]

[[Category: Miller, M T]]

[[Category: Rosenzweig, A C]]

[[Category: Stapon, A]]

[[Category: Townsend, C A]]

[[Category: Amp-cpp]]

[[Category: Some]]