1cb7

<StructureSection load='1cb7' size='340' side='right' caption='[[1cb7]], [[Resolution|resolution]] 2.00&Aring;' scene=''>

<table><tr><td colspan='2'>[[1cb7]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Clostridium_cochlearium Clostridium cochlearium]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CB7 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1CB7 FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=COB:CO-METHYLCOBALAMIN'>COB</scene>, <scene name='pdbligand=TAR:D(-)-TARTARIC+ACID'>TAR</scene></td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">GLMS ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1494 Clostridium cochlearium]), GLME ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1494 Clostridium cochlearium])</td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Methylaspartate_mutase Methylaspartate mutase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.4.99.1 5.4.99.1] </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=1cb7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cb7 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1cb7 RCSB], [http://www.ebi.ac.uk/pdbsum/1cb7 PDBsum]</span></td></tr>

<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/cb/1cb7_consurf.spt"</scriptWhenChecked>

</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/chain_selection.php?pdb_ID=2ata ConSurf].

<div style="background-color:#fffaf0;">

== Publication Abstract from PubMed ==

BACKGROUND: Glutamate mutase (Glm) equilibrates (S)-glutamate with (2S,3S)-3-methylaspartate. Catalysis proceeds with the homolytic cleavage of the organometallic bond of the cofactor to yield a 5'-desoxyadenosyl radical. This radical then abstracts a hydrogen atom from the protein-bound substrate to initiate the rearrangement reaction. Glm from Clostridium cochlearium is a heterotetrameric molecule consisting of two sigma and two epsilon polypeptide chains. RESULTS: We have determined the crystal structures of inactive recombinant Glm reconstituted with either cyanocobalamin or methylcobalamin. The molecule shows close similarity to the structure of methylmalonyl CoA mutase (MCM), despite poor sequence similarity between its catalytic epsilon subunit and the corresponding TIM-barrel domain of MCM. Each of the two independent B12 cofactor molecules is associated with a substrate-binding site, which was found to be occupied by a (2S,3S)-tartrate ion. A 1:1 mixture of cofactors with cobalt in oxidation states II and III was observed in both crystal structures of inactive Glm. CONCLUSIONS: The long axial cobalt-nitrogen bond first observed in the structure of MCM appears to result from a contribution of the species without upper ligand. The tight binding of the tartrate ion conforms to the requirements of tight control of the reactive intermediates and suggests how the enzyme might use the substrate-binding energy to initiate cleavage of the cobalt-carbon bond. The cofactor does not appear to have a participating role during the radical rearrangement reaction.

Glutamate mutase from Clostridium cochlearium: the structure of a coenzyme B12-dependent enzyme provides new mechanistic insights.,Reitzer R, Gruber K, Jogl G, Wagner UG, Bothe H, Buckel W, Kratky C Structure. 1999 Aug 15;7(8):891-902. PMID:10467146<ref>PMID:10467146</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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[[Category: Methylaspartate mutase]]

[[Category: Gruber, K]]

[[Category: Kratky, C]]

[[Category: Reitzer, R]]

[[Category: Tim-barrel]]