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. 1986 Jul;167(1):205–209. doi: 10.1128/jb.167.1.205-209.1986

Cloning and expression in Escherichia coli of the gene for 10-formyltetrahydrofolate synthetase from Clostridium acidiurici ("Clostridium acidi-urici").

T R Whitehead, J C Rabinowitz
PMCID: PMC212862  PMID: 3013834

Abstract

The gene for 10-formyltetrahydrofolate synthetase (EC 6.3.4.3) from the purinolytic anaerobic bacterium Clostridium acidiurici ("Clostridium acidi-urici") was cloned into Escherichia coli JM83 with plasmid pUC8. A C. acidiurici genomic library was prepared in E. coli from a partial Sau3A digest and screened with antibody against the synthetase. Of 10 antibody-positive clones, 1 expressed a high level of synthetase activity. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblot analysis demonstrated that the protein synthesized in E. coli had the same subunit molecular weight as the C. acidiurici enzyme. The gene was located on an 8.3-kilobase genomic insert and appeared to be transcribed from its own promoter. Analysis of genomic digests with a fragment of the synthetase gene indicated that one copy of the gene was present in the C. acidiurici chromosome.

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Selected References

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