Abstract
Clones of the Escherichia coli bisC locus have been isolated by complementing a bisC mutant for growth with d-biotin d-sulfoxide as a biotin source. The complementation properties of deletions and Tn5 insertions located the bisC gene to a 3.7-kilobase-pair (kbp) segment, 3.3 kbp of which has been sequenced. A single open reading frame of 2,178 bp, capable of encoding a polypeptide of molecular weight 80,905, was found. In vitro transcription of plasmids carrying the wild-type sequence and deletion and insertion mutants showed that BisC complementation correlated perfectly with production of a polypeptide whose measured molecular weight (79,000) does not differ significantly from 80,905.
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