|Structure (2002) 10(11):1475-87|
|Northeast Structural Genomics Consortium|
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The CbiT and CbiE enzymes participate in the biosynthesis of vitamin B12. ...
They are fused together in some organisms to form a protein called CobL, which catalyzes two methylations and one decarboxylation on a precorrin intermediate. Because CbiE has sequence homology to canonical precorrin methyltransferases, CbiT was hypothesized to catalyze the decarboxylation. We herein present the crystal structure of MT0146, the CbiT homolog from Methanobacterium thermoautotrophicum. The protein shows structural similarity to Rossmann-like S-adenosyl-methionine-dependent methyltransferases, and our 1.9 A cocrystal structure shows that it binds S-adenosyl-methionine in standard geometry near a binding pocket that could accommodate a precorrin substrate. Therefore, MT0146/CbiT probably functions as a precorrin methyltransferase and represents the first enzyme identified with this activity that does not have the canonical precorrin methyltransferase fold.
|metabolism chemistry |
|Binding Sites Crystallography, X-Ray Protein Structure, Tertiary Amino Acid Sequence Models, Molecular Molecular Sequence Data Protein Binding Protein Structure, Secondary Models, Chemical Cloning, Molecular Protein Folding Sequence Homology, Amino Acid Methanobacterium Dimerization S-Adenosylmethionine Methyltransferases Promoter Regions, Genetic |
|29 (Last update: 11/10/2018 9:29:47pm)|
|Structure. 2002 Nov;10(11):1475-87.|