The glucosyltransferases from oral streptococci cleave sucrose and polymerize the glucose moieties. In Streptococcus salivarius ATCC 25975, two glucosyltransferase-encoding genes, gtfJ and gtfK, are closely linked and transcribed in the same direction. A procedure for the isolation of intact RNA from this organism was devised. The procedure incorporated a high-temperature mutanolysin treatment and selective precipitation by LiCl. The RNA was subject to Northern hybridization and RNase protection assays and it was concluded that the two genes are transcribed separately. A potential factor-independent transcription terminator was located in the intergenic region.
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Simpson et al. (1993) studied this question.
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