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==Crystal structure of tryptophan synthase alpha-subunit from the psychrophile Shewanella frigidimarina K14-2==
<StructureSection load='3vnd' size='340' side='right'caption='[[3vnd]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3vnd]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Shewanella_frigidimarina Shewanella frigidimarina]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3VND OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3VND 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]] 2.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PE8:3,6,9,12,15,18,21-HEPTAOXATRICOSANE-1,23-DIOL'>PE8</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=3vnd FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3vnd OCA], [https://pdbe.org/3vnd PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3vnd RCSB], [https://www.ebi.ac.uk/pdbsum/3vnd PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3vnd ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/H1AFK5_SHEFR H1AFK5_SHEFR] The alpha subunit is responsible for the aldol cleavage of indoleglycerol phosphate to indole and glyceraldehyde 3-phosphate.[HAMAP-Rule:MF_00131][SAAS:SAAS00108583]
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== Publication Abstract from PubMed ==
To investigate the molecular basis of cold adaptation of enzymes, we determined the crystal structure of the tryptophan synthase alpha subunit (SfTSA) from the psychrophile Shewanella frigidimarina K14-2 by X-ray analysis at 2.6-A resolution and also examined its physicochemical properties. SfTSA was found to have the following characteristics: (i) The stabilities against heat and denaturant of SfTSA were lower than those of an alpha subunit (EcTSA) from Escherichia coli. This lower equilibrium stability originated from both a faster unfolding rate and a slower refolding rate; (ii) the heat denaturation of SfTSA was completely reversible at pH 7.0 and the solubility of denatured SfTSA was higher than that of denatured EcTSA. The two-state transition of denaturation for SfTSA was highly cooperative, whereas the denaturation process of EcTSA was considerably more complex and (iii) the global structure of SfTSA was quite similar to those of alpha subunits from other species. Relative to those other proteins, SfTSA exhibited an increase in cavity volume and a decrease in the number of ion pairs. SfTSA also lacks a hydrogen bond near loop B, related to catalytic function. These characteristics of SfTSA might provide the conformational flexibility required for catalytic activity at low temperatures.

Strategy for cold adaptation of the tryptophan synthase alpha subunit from the psychrophile Shewanella frigidimarina K14-2: crystal structure and physicochemical properties.,Mitsuya D, Tanaka S, Matsumura H, Urano N, Takano K, Ogasahara K, Takehira M, Yutani K, Ishida M J Biochem. 2014 Feb;155(2):73-82. doi: 10.1093/jb/mvt098. Epub 2013 Oct 25. PMID:24163283<ref>PMID:24163283</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Tryptophan synthase 3D structures|Tryptophan synthase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Shewanella frigidimarina]]
[[Category: Ishida M]]
[[Category: Matsumura H]]
[[Category: Mitsuya D]]
[[Category: Takano K]]
[[Category: Tanaka S]]
[[Category: Urano N]]