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The DNA coding for RNase H from a mutant strain ofEscherichia coli (FB2) was cloned into plasmid pBR322. DNA sequence analysis and the exchange of a portion of the mutant and wild-type genes revealed that a single-base alteration (C→T) in the coding region of the structural gene for RNase H is responsible for the difference in RNase H activity of the wild-type and mutant cells.

Low Levels of RNase H Activity in Escherichia coli FB2 rnh Result from a Single-Base Change in the Structural Gene of RNase H