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. 1980 Feb;141(2):779–785. doi: 10.1128/jb.141.2.779-785.1980

Protein expression in Escherichia coli minicells containing recombinant plasmids specifying trimethoprim-resistant dihydrofolate reductases.

M E Fling, L P Elwell
PMCID: PMC293688  PMID: 6988391

Abstract

Deoxyribonucleic acid fragments containing the structural genes for several trimethoprim-resistant dihydrofolate reductases from naturally occurring plasmids were inserted into small cloning vehicles. The genetic expression of these hybrid plasmids was studied in purified Escherichia coli minicells. The type I dihydrofolate reductase, encoded by plasmid R483 and residing within transposon 7 (Tn7), had a subunit molecular weight of 18,000. The type II dihydrofolate reductase, specified by plasmid R67, had a subunit molecular weight of 9,000. These two enzymes were antigenically distinct in that anti-type II dihydrofolate reductase (R67) antibody did not cross-react with the type I (R483) protein. The trimethoprim-resistant reductase specified by plasmid R388 had a subunit molecular weight of about 10,500 and was immunologically related to the type II (R67) enzyme. A 9,000 subunit of the dihydrofolate encoded by the transposition element Tn402 was also antigenically related to the R67 reductase.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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