View source for 1geq


==Entropic stabilization of the tryptophan synthase A-subunit from a hyperthermophile, pyrococcus furiosus: X-ray analysis and calorimetry==
<StructureSection load='1geq' size='340' side='right'caption='[[1geq]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1geq]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_43587 Atcc 43587]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1GEQ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1GEQ FirstGlance]. <br>
</td></tr><tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Tryptophan_synthase Tryptophan synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.1.20 4.2.1.20] </span></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=1geq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1geq OCA], [http://pdbe.org/1geq PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1geq RCSB], [http://www.ebi.ac.uk/pdbsum/1geq PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1geq ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/TRPA_PYRFU TRPA_PYRFU]] The alpha subunit is responsible for the aldol cleavage of indoleglycerol phosphate to indole and glyceraldehyde 3-phosphate. 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ge/1geq_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1geq ConSurf].
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== Publication Abstract from PubMed ==
The structure of the tryptophan synthase alpha-subunit from Pyrococcus furiosus was determined by x-ray analysis at 2.0-A resolution, and its stability was examined by differential scanning calorimetry. Although the structure of the tryptophan synthase alpha(2)beta(2) complex from Salmonella typhimurium has been already determined, this is the first report of the structure of the alpha-subunit alone. The alpha-subunit from P. furiosus (Pf-alpha-subunit) lacked 12 and 6 residues at the N and C termini, respectively, and one residue each in two loop regions as compared with that from S. typhimurium (St-alpha-subunit), resulting in the absence of an N-terminal helix and the shortening of a C-terminal helix. The structure of the Pf-alpha-subunit was essentially similar to that of the St-alpha-subunit in the alpha(2)beta(2) complex. The differences between both structures were discussed in connection with the higher stability of the Pf-alpha-subunit and the complex formation of the alpha- and beta-subunits. Calorimetric results indicated that the Pf-alpha-subunit has extremely high thermostability and that its higher stability is caused by an entropic effect. On the basis of structural information of both proteins, we analyzed the contributions of each stabilization factor and could conclude that hydrophobic interactions in the protein interior do not contribute to the higher stability of the Pf-alpha-subunit. Rather, the increase in ion pairs, decrease in cavity volume, and entropic effects due to shortening of the polypeptide chain play important roles in extremely high stability in Pf-alpha-subunit.

Entropic stabilization of the tryptophan synthase alpha-subunit from a hyperthermophile, Pyrococcus furiosus. X-ray analysis and calorimetry.,Yamagata Y, Ogasahara K, Hioki Y, Lee SJ, Nakagawa A, Nakamura H, Ishida M, Kuramitsu S, Yutani K J Biol Chem. 2001 Apr 6;276(14):11062-71. Epub 2000 Dec 15. PMID:11118452<ref>PMID:11118452</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 1geq" style="background-color:#fffaf0;"></div>

==See Also==
*[[Tryptophan synthase|Tryptophan synthase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Atcc 43587]]
[[Category: Large Structures]]
[[Category: Tryptophan synthase]]
[[Category: Yamagata, Y]]
[[Category: Yutani, K]]
[[Category: Calorimetry]]
[[Category: Hyperthermophile]]
[[Category: Lyase]]
[[Category: Pyrococcus furiosus]]
[[Category: Stability]]
[[Category: Tryptophan synthase alpha-subunit]]
[[Category: X-ray analysis]]