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Mol Gen Genet. 1992 Sep;234(3):429-32.

Insertional disruption of the nusB (ssyB) gene leads to cold-sensitive growth of Escherichia coli and suppression of the secY24 mutation.

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Institute for Virus Research, Kyoto University, Japan.


The Escherichia coli gene ssyB was cloned and sequenced. The ssyB63 (Cs) mutation is an insertion mutation in nusB, while the nusB5 (Cs) mutation suppresses secY24, indicating that inactivation of nusB causes cold-sensitive cell growth as well as phenotypic suppression of secY24. The correct map position of nusB is 9.5 min rather than 11 min as previously assigned. It is located at the distal end of an operon that contains a gene showing significant homology with a Bacillus subtilis gene involved in riboflavin biosynthesis.

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