Cobalamin (vitamin B12) biosynthesis: identification and characterization of a Bacillus megaterium cobI operon

Raux-Deery, Evelyne and Lanois, A and Warren, Martin J. and Rambach, Alain and Thermes, C. (1998) Cobalamin (vitamin B12) biosynthesis: identification and characterization of a Bacillus megaterium cobI operon. Biochemical Journal , 335 (1). pp. 159-66. ISSN 0264-6021. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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A 16 kb DNA fragment has been isolated from a Bacillus megaterium genomic library and fully sequenced. The fragment contains 15 open reading frames, 14 of which are thought to constitute a B. megaterium cobalamin biosynthetic (cob) operon. Within the operon, 11 genes display similarity to previously identified Salmonella typhimurium cobalamin biosynthetic genes (cbiH60, -J, -C, -D, -ET, -L, -F, -G, -A, cysGA and btuR), whereas three do not (cbiW, -X and -Y). The genes of the B. megaterium cob operon were compared with the cobalamin biosynthetic genes of Pseudomonas denitrificans, Methanococcus jannaschii and Synechocystis sp. Taking into account the presence of cbiD and cbiG, the absence of a cobF, cobG and cobN, -S and -T, it was concluded that B. megaterium, M. jannaschii and Synechocystis sp., like S. typhimurium, synthesize cobalamin by an anaerobic pathway, in which cobalt is added at an early stage and molecular oxygen is not required.

Item Type: Article
Uncontrolled keywords: Bacillus megaterium/*genetics Codon, Initiator DNA, Bacterial/chemistry/isolation & purification Molecular Sequence Data Open Reading Frames Operon Sequence Analysis, DNA Vitamin B 12/*biosynthesis/*genetics
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Biosciences
Depositing User: Martin Warren
Date Deposited: 16 Oct 2009 07:58
Last Modified: 23 Jun 2014 15:51
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