View source for 3vvm


==Crystal structure of G52A-P55G mutant of L-serine-O-acetyltransferase found in D-cycloserine biosynthetic pathway==
<StructureSection load='3vvm' size='340' side='right'caption='[[3vvm]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3vvm]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptomyces_lavendulae_subsp._lavendulae Streptomyces lavendulae subsp. lavendulae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3VVM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3VVM 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]] 1.7&#8491;</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=3vvm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3vvm OCA], [https://pdbe.org/3vvm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3vvm RCSB], [https://www.ebi.ac.uk/pdbsum/3vvm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3vvm ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/DCSE_STRLA DCSE_STRLA] Involved in the biosynthesis of the antibiotic D-cycloserine (DCS), a cyclic structural analog of D-alanine, used as an antitubercular agent. Catalyzes the transfer of the acetyl group from acetyl-CoA to the hydroxyl group of L-serine to yield the activated serine, O-acetyl-L-serine. It prefers L-serine over L-homoserine.<ref>PMID:20086163</ref> <ref>PMID:23396912</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
DcsE, one of the enzymes found in the d-cycloserine biosynthetic pathway, displays a high sequence homology to l-homoserine O-acetyltransferase (HAT), but it prefers l-serine over l-homoserine as the substrate. To clarify the substrate specificity, in the present study we determined the crystal structure of DcsE at a 1.81 A resolution, showing that the overall structure of DcsE is similar to that of HAT, whereas a turn region to form an oxyanion hole is obviously different between DcsE and HAT: in detail, the first and last residues in the turn of DcsE are Gly(52) and Pro(55), respectively, but those of HAT are Ala and Gly. In addition, more water molecules were laid on one side of the turn region of DcsE than on that of HAT, and a robust hydrogen-bonding network was formed only in DcsE. We created a HAT-like mutant of DcsE in which Gly(52) and Pro(55) were replaced by Ala and Gly, respectively, showing that the mutant acetylates l-homoserine but scarcely l-serine. The crystal structure of the mutant DcsE shows that the active site, including the turn and its surrounding waters, is similar to that of HAT. These findings suggest that a methyl group of the first residue in the turn of HAT plays a role in excluding the binding of l-serine to the substrate-binding pocket. In contrast, the side chain of the last residue in the turn of DcsE may need to form an extensive hydrogen-bonding network on the turn, which interferes with the binding of l-homoserine.

Crystallographic study to determine the substrate specificity on an L-serine-acetylating enzyme found in the D-cycloserine biosynthetic pathway.,Oda K, Matoba Y, Kumagai T, Noda M, Sugiyama M J Bacteriol. 2013 Feb 8. PMID:23396912<ref>PMID:23396912</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 3vvm" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Streptomyces lavendulae subsp. lavendulae]]
[[Category: Kumagai T]]
[[Category: Matoba Y]]
[[Category: Noda M]]
[[Category: Oda K]]
[[Category: Sugiyama M]]