View source for 5lqd


==Trehalose-6-phosphate synthase, GDP-glucose-dependent OtsA==
<StructureSection load='5lqd' size='340' side='right'caption='[[5lqd]], [[Resolution|resolution]] 1.95&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5lqd]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Streptomyces_venezuelae_ATCC_10712 Streptomyces venezuelae ATCC 10712]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5LQD OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5LQD 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]] 1.95&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=MES:2-(N-MORPHOLINO)-ETHANESULFONIC+ACID'>MES</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=5lqd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5lqd OCA], [https://pdbe.org/5lqd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5lqd RCSB], [https://www.ebi.ac.uk/pdbsum/5lqd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5lqd ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/F2RH01_STRVP F2RH01_STRVP] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Trehalose-6-phosphate synthase OtsA from streptomycetes is unusual in that it uses GDP-glucose as the donor substrate rather than the more commonly used UDP-glucose. We now confirm that OtsA from Streptomyces venezuelae has such a preference for GDP-glucose and can utilise ADP-glucose to some extent too. A crystal structure of the enzyme shows that it shares twin Rossmann-like domains with the UDP-glucose-specific OtsA from Escherichia coli However, it is structurally more similar to Streptomyces hygroscopicus VldE, a GDP-valienol-dependent pseudo-glycosyltransferase enzyme. Comparison of the donor binding sites reveals that the amino acids associated with the binding of diphosphoribose are almost all identical in these three enzymes. By contrast, the amino acids associated with binding guanine in VldE (Asn, Thr and Val) are similar in S. venezuelae OtsA (Asp, Ser and Phe, respectively) but not conserved in E. coli OtsA (His, Leu and Asp, respectively), providing a rationale for the purine base-specificity of S. venezuelae OtsA. To establish which donor is used in vivo, we generated an otsA null mutant in S. venezuelae The mutant had a cell-density-dependent growth phenotype and accumulated galactose-1-phosphate, glucose-1-phosphate and GDP-glucose when grown on galactose. To determine how the GDP-glucose is generated, we characterised three candidate GDP-glucose pyrophosphorylases. SVEN_3027 is a UDP-glucose pyrophosphorylase, SVEN_3972 is an unusual ITP-mannose pyrophosphorylase, and SVEN_2781 is a pyrophosphorylase that is capable of generating GDP-glucose as well as GDP-mannose. We have therefore established how S. venezuelae can make and utilise GDP-glucose in the biosynthesis of trehalose-6-phosphate.

The production and utilization of GDP-glucose in the biosynthesis of trehalose-6-phosphate by Streptomyces venezuelae.,Asencion Diez MD, Miah F, Stevenson CE, Lawson DM, Iglesias AA, Bornemann S J Biol Chem. 2016 Nov 30. pii: jbc.M116.758664. PMID:27903647<ref>PMID:27903647</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5lqd" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Streptomyces venezuelae ATCC 10712]]
[[Category: Asencion Diez MD]]
[[Category: Bornemann S]]
[[Category: Iglesias AA]]
[[Category: Lawson DM]]
[[Category: Miah F]]
[[Category: Stevenson CEM]]