Oct 25, 1989

The function of micF RNA. micF RNA is a major factor in the thermal regulation of OmpF protein in Escherichia coli

The Journal of Biological Chemistry
J AndersenN Delihas


The role of chromosomally derived micF RNA as a repressor of outer membrane protein OmpF of Escherichia coli was examined for various growth conditions. Levels of micF RNA as determined by Northern analyses are found to increase in response to cell growth at high temperature, in high osmolarity or in the presence of ethanol. After a switch to higher growth temperature, the levels of ompF mRNA and of newly synthesized OmpF decrease with time in E. coli strain, MC4100 but these decreases are not observed in isogenic micF deletion strain, SM3001. In addition, while levels of ompF mRNA are substantially reduced in both strains in response to high osmolarity or ethanol at 24 degrees C, the reduced levels in the parental strain are still 4-5-fold lower compared with the micF deletion strain. These findings indicate that chromosomally derived micF RNA plays a major role in the thermal regulation of OmpF and represses OmpF synthesis in response to several environmental signals by decreasing the levels of ompF mRNA. Analyses of the effect of a multicopy micF plasmid on the levels of OmpF and ompF mRNA after an increase in temperature indicated that multicopies of micF RNA markedly inhibited OmpF synthesis but did not accentuate ompF mRN...Continue Reading

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Mentioned in this Paper

Transcription Repressor/Corepressor
Alkalescens-Dispar Group
Ethanol Measurement
Cold Temperature
Osmolarity Measurement
Transcription, Genetic
Antisense RNA
Gene Deletion Abnormality
Outer Membrane Lipoproteins, Bacterial

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