1nu5

<StructureSection load='1nu5' size='340' side='right' caption='[[1nu5]], [[Resolution|resolution]] 1.95&Aring;' scene=''>

<table><tr><td colspan='2'>[[1nu5]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Psesq Psesq]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NU5 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1NU5 FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MN:MANGANESE+(II)+ION'>MN</scene></td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Chloromuconate_cycloisomerase Chloromuconate cycloisomerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.5.1.7 5.5.1.7] </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=1nu5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1nu5 OCA], [http://pdbe.org/1nu5 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1nu5 RCSB], [http://www.ebi.ac.uk/pdbsum/1nu5 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1nu5 ProSAT]</span></td></tr>

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== Publication Abstract from PubMed ==

Bacterial muconate lactonizing enzymes (MLEs) catalyze the conversion of cis,cis-muconate as a part of the beta-ketoadipate pathway, and some MLEs are also able to dehalogenate chlorinated muconates (Cl-MLEs). The basis for the Cl-MLEs dehalogenating activity is still unclear. To further elucidate the differences between MLEs and Cl-MLEs, we have solved the structure of Pseudomonas P51 Cl-MLE at 1.95 A resolution. Comparison of Pseudomonas MLE and Cl-MLE structures reveals the presence of a large cavity in the Cl-MLEs. The cavity may be related to conformational changes on substrate binding in Cl-MLEs, at Gly52. Site-directed mutagenesis on Pseudomonas MLE core positions to the equivalent Cl-MLE residues showed that the variant Thr52Gly was rather inactive, whereas the Thr52Gly-Phe103Ser variant had regained part of the activity. These residues form a hydrogen bond in the Cl-MLEs. The Cl-MLE structure, as a result of the Thr-to-Gly change, is more flexible than MLE: As a mobile loop closes over the active site, a conformational change at Gly52 is observed in Cl-MLEs. The loose packing and structural motions in Cl-MLE may be required for the rotation of the lactone ring in the active site necessary for the dehalogenating activity of Cl-MLEs. Furthermore, we also suggest that differences in the active site mobile loop sequence between MLEs and Cl-MLEs result in lower active site polarity in Cl-MLEs, possibly affecting catalysis. These changes could result in slower product release from Cl-MLEs and make it a better enzyme for dehalogenation of substrate.

The structure of Pseudomonas P51 Cl-muconate lactonizing enzyme: co-evolution of structure and dynamics with the dehalogenation function.,Kajander T, Lehtio L, Schlomann M, Goldman A Protein Sci. 2003 Sep;12(9):1855-64. PMID:12930985<ref>PMID:12930985</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 1nu5" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Chloromuconate cycloisomerase]]

[[Category: Psesq]]

[[Category: Goldman, A]]

[[Category: Kajander, T]]

[[Category: Lehtio, L]]

[[Category: Muconate]]