TY - JOUR
T1 - Lethal double-stranded RNA processing activity of ribonuclease III in the absence of SuhB protein of Escherichia coli
AU - Inada, T.
AU - Nakamura, Y.
PY - 1995
Y1 - 1995
N2 - The suhB gene of Escherichia coli has been defined by its mutant allele that suppresses other mutants in secY, rpoH, dnaB, and era. The suhB mutant by itself is cold sensitive, and is shown to have defects in protein synthesis. Starting with the suhB cold-sensitive mutant, cold-resistant suppressors were isolated. These suppressors mapped to the gene rnc encoding RNase III (a double-strand RNA-processing enzyme), and restored normal protein synthesis to the suhB mutants. Two known rnc mutations, rnc70 or rnc105, both defective in RNA cleavage activity, similarly restored growth of suhB. These rnc mutations did not alter the level of suhB expression. These results suggest that wild-type RNase III exerts a lethal effect on E coli upon depletion of SuhB at low temperatures. One explanation is to assume that the double-strand RNA-processing activity of RNase III itself is potentially lethal to E coli and the normal function of SuhB modulates the lethal action of RNase III.
AB - The suhB gene of Escherichia coli has been defined by its mutant allele that suppresses other mutants in secY, rpoH, dnaB, and era. The suhB mutant by itself is cold sensitive, and is shown to have defects in protein synthesis. Starting with the suhB cold-sensitive mutant, cold-resistant suppressors were isolated. These suppressors mapped to the gene rnc encoding RNase III (a double-strand RNA-processing enzyme), and restored normal protein synthesis to the suhB mutants. Two known rnc mutations, rnc70 or rnc105, both defective in RNA cleavage activity, similarly restored growth of suhB. These rnc mutations did not alter the level of suhB expression. These results suggest that wild-type RNase III exerts a lethal effect on E coli upon depletion of SuhB at low temperatures. One explanation is to assume that the double-strand RNA-processing activity of RNase III itself is potentially lethal to E coli and the normal function of SuhB modulates the lethal action of RNase III.
KW - RNase III
KW - SuhB
KW - double-strand RNA processing
KW - suppressor mutations
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U2 - 10.1016/0300-9084(96)88139-9
DO - 10.1016/0300-9084(96)88139-9
M3 - Article
C2 - 8589060
AN - SCOPUS:0029008560
VL - 77
SP - 294
EP - 302
JO - Biochimie
JF - Biochimie
SN - 0300-9084
IS - 4
ER -