1id8

NMR STRUCTURE OF GLUTAMATE MUTASE (B12-BINDING SUBUNIT) COMPLEXED WITH THE VITAMIN B12 NUCLEOTIDE

spinqualitylabelsall models 1id8 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1id8 is a 1 chain structure with sequence from Clostridium tetanomorphum. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR Ligands: DBI, FOP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function GMSS_CLOTT Catalyzes the carbon skeleton rearrangement of L-glutamate to L-threo-3-methylaspartate ((2S,3S)-3-methylaspartate).[HAMAP-Rule:MF_00526] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Glutamate mutase from Clostridium tetanomorphum binds coenzyme B(12) in a base-off/His-on form, in which the nitrogenous ligand of the B(12)-nucleotide function is displaced from cobalt by a conserved histidine. The effect of binding the B(12)-nucleotide moiety to MutS, the B(12)-binding subunit of glutamate mutase, was investigated using NMR spectroscopic methods. Binding of the B(12)-nucleotide to MutS was determined to occur with K(d)=5.6(+/-0.7) mM and to be accompanied by a specific conformational change in the protein. The nucleotide binding cleft of the apo-protein, which is formed by a dynamic segment with propensity for partial alpha-helical conformation (the "nascent" alpha-helix), becomes completely structured upon binding of the B(12)-nucleotide, with formation of helix alpha1. In contrast, the segment containing the conserved residues of the B(12)-binding Asp-x-His-x-x-Gly motif remains highly dynamic in the protein/B(12)-nucleotide complex. From relaxation studies, the time constant tau, which characterizes the time scale for the formation of helix alpha1, was estimated to be about 30 micros (15)N and was the same in both, apo-protein and nucleotide-bound protein. Thus, the binding of the B(12)-nucleotide moiety does not significantly alter the kinetics of helix formation, but only shifts the equilibrium towards the structured fold. These results indicate MutS to be structured in such a way, as to be able to trap the nucleotide segment of the base-off form of coenzyme B(12) and provide, accordingly, the first structural clues as to how the process of B(12)-binding occurs. The B(12)-binding subunit of glutamate mutase from Clostridium tetanomorphum traps the nucleotide moiety of coenzyme B(12).,Tollinger M, Eichmuller C, Konrat R, Huhta MS, Marsh EN, Krautler B J Mol Biol. 2001 Jun 8;309(3):777-91. PMID:11397096 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

Proteopedia Page Contributors and Editors (what is this?)

OCA