1r53

<table><tr><td colspan='2'>[[1r53]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_18824 Atcc 18824]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1R53 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=1R53 FirstGlance]. <br>

</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1r52|1r52]]</div></td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">YGL148w ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4932 ATCC 18824])</td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Chorismate_synthase Chorismate synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.3.5 4.2.3.5] </span></td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=1r53 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1r53 OCA], [http://pdbe.org/1r53 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1r53 RCSB], [http://www.ebi.ac.uk/pdbsum/1r53 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1r53 ProSAT]</span></td></tr>

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== Publication Abstract from PubMed ==

Chorismate synthase (EC 4.2.3.5), the seventh enzyme in the shikimate pathway, catalyzes the transformation of 5-enolpyruvylshikimate 3-phosphate (EPSP) to chorismate, which is the last common precursor in the biosynthesis of numerous aromatic compounds in bacteria, fungi, and plants. The chorismate synthase reaction involves a 1,4-trans-elimination of phosphoric acid from EPSP and has an absolute requirement for reduced FMN as a cofactor. We have determined the three-dimensional x-ray structure of the yeast chorismate synthase from selenomethionine-labeled crystals at 2.2-A resolution. The structure shows a novel betaalphabetaalpha fold consisting of an alternate tight packing of two alpha-helical and two beta-sheet layers, showing no resemblance to any documented protein structure. The molecule is arranged as a tight tetramer with D2 symmetry, in accordance with its quaternary structure in solution. Electron density is missing for 23% of the amino acids, spread over sequence regions that in the three-dimensional structure converge on the surface of the protein. Many totally conserved residues are contained within these regions, and they probably form a structured but mobile domain that closes over a cleft upon substrate binding and catalysis. This hypothesis is supported by previously published spectroscopic measurements implying that the enzyme undergoes considerable structural changes upon binding of both FMN and EPSP.

Crystal structure of the bifunctional chorismate synthase from Saccharomyces cerevisiae.,Quevillon-Cheruel S, Leulliot N, Meyer P, Graille M, Bremang M, Blondeau K, Sorel I, Poupon A, Janin J, van Tilbeurgh H J Biol Chem. 2004 Jan 2;279(1):619-25. Epub 2003 Oct 21. PMID:14573601<ref>PMID:14573601</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 1r53" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Atcc 18824]]

[[Category: Chorismate synthase]]

[[Category: Blondeau, K]]

[[Category: Bremang, M]]

[[Category: Graille, M]]

[[Category: Janin, J]]

[[Category: Leulliot, N]]

[[Category: Meyer, P]]

[[Category: Poupon, A]]

[[Category: Quevillon-Cheruel, S]]

[[Category: Sorel, I]]

[[Category: Tilbeurgh, H van]]

[[Category: Two layers alpha-beta]]