Expression of 9 Salmonella typhimurium enzymes for cobinamide synthesis Identification of the 11‐methyl and 20‐methyl transferases of corrin biosynthesis

FEBS Letters

Atshaves, Barbara P.¹  Warren, Martin J.¹  Iida, Katsumi¹  Ozaki, Shin-ichi¹  Scott, A.Ian¹  Roessner, Charles A.¹  Santander, Patricio J.¹  Stolowich, Neal J.¹ 

[1] Center for Biological NMR, Department of Chemistry, Texas A&M University, College Station, TX 77843-3255, USA

关键词: Precorrin methyltransferase;    13C-NMR;    Corrin biosynthesis;    Salmonella typhimurium;    ALA;    5-aminolevulinic acid;    PBG;    porphobilinogen;    SDS-PAGE;    sodium dodecylsulfate polyacrylamide gel electrophoresis;    SAM;    S-adenosylmethionine;    NMR;    nuclear magnetic resonance;   

DOI  :  10.1016/0014-5793(92)80213-Z

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Nine of the cbi genes from the 17.5 kb cob operon of Salmonella typhimurium previously shown by genetic studies to be involved in the biosynthesis of cobinamide from precorrin-2, have been subcloned and expressed in Escherichia coli. Seven of the gene products were found in the soluble fraction of cell lysates and have been purified. The gene products corresponding to cbi E, F, H and L were shown by SAM binding and by homology with other SAM-binding proteins to be candidates for the methyltransferases of vitamin B₁₂ biosynthesis. The enzymatic functions of the gene products of cbiL and cbiF are associated with C-methylation at C-20 of precorrin-2 and C-11 of precorrin-3.

【 授权许可】

Unknown