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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Authors: | Tetsuya Taura Chiharu Ueguchi Kiyotaka Shiba Koreaki Ito |
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Affiliation: | (1) Institute for Virus Research, Kyoto University, 606-01 Kyoto, Japan;(2) Cancer Institute, 170 Ikebukuro, Tokyo, Japan;(3) Present address: Laboratory of Microbiology, School of Agriculture, Nagoya University, 464 Nagoya, Japan |
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Abstract: | Summary 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 I I 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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Keywords: | Protein secretion Suppressor of secY Riboflavin biosynthesis nusB gene ssyB mutation |
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