NDLI: Molecular analysis and heterologous expression of the gene encoding methylmalonyl—coenzyme a mutase from rifamycin SV-producing strain Amycolatopsis mediterranei U32

Content Provider	Springer Nature Link
Author	Zhang, Weiwen Yang, Ling Jiang, Weihong Zhao, Guoping Yang, Yinliu Chiao, Juishen
Copyright Year	1999
Abstract	The conversion of succinyl-coenzyme A (CoA) into methylmalonyl-CoA, catalyzed by adenosylcobalamin-dependent methylmalonyl-CoA mutase (MCM), represents an important source of building blocks for rifamycin SV biosynthesis. The structural gene for MCM from rifamycin SV—producing strain Amycolatopsis mediterranei U32 was isolated by using a heterologous gene probe encoding the MCM of Streptomyces cinnamonensis. A 7.8-kbp fragment was sequenced and four complete open reading frames (ORFs) and two incomplete ORFs were found. Two central ORFs, ORF3 and ORF4, overlap by four nucleotides and were found to encode MCM small (602 residues) and large (721 residues) subunits, respectively. Comparison showed that the MCM gene of A. mediterranei U32 was quite similar to those from other sources. The functionally unknown ORF5, immediately downstream of the mut AB gene, was quite similar to the ORFs downstream of mut AB from S. cinnamonensis and Mycobacterium tuberculosis. Such a striking cross-species conservation of gene order suggested that ORF5 could also be involved in the metabolism of methylmalonyl-CoA. MCM gene was overexpressed in Escherichia coli under T7 promoter, and MCM activity could be detected in the recombinant E. coli clone harboring MCM gene after the addition of coenzyme B$_{12}$. A purification procedure based on the B$_{12}$ affinity column was established to purify the MCM from E. coli. The molecular weight of purified MCM from E. coli was determined by sodium dodecyl sulfate polyacrylamide gel electrophoresis, which corresponds to that calculated from the MCM protein sequence and is also the same size as that of the enzyme purified directly from A. mediterranei U32. MCM gene was overexpressed in polyketide monensin producing S. cinnamonensis, and the total monensin production was increased by 32%.
Starting Page	209
Ending Page	225
Page Count	17
File Format	PDF
ISSN	02732289
Journal	Applied Biochemistry and Biotechnology
Volume Number	82
Issue Number	3
e-ISSN	15590291
Language	English
Publisher	Humana Press
Publisher Date	1999-01-01
Publisher Place	Totowa
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biotechnology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Molecular Biology Environmental Engineering Biochemistry Bioengineering Applied Microbiology and Biotechnology Biotechnology

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