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. 1978 Jan;133(1):256–264. doi: 10.1128/jb.133.1.256-264.1978

Low-temperature conditional cell division mutants of Escherichia coli.

J A Sturgeon, L O Ingram
PMCID: PMC222002  PMID: 338580

Abstract

Fifteen low-temperature conditional division mutants of Escherichia coli K-12 was isolated. They grew normally at 39 degrees C but formed filaments at 30 degrees C. All exhibited a coordinated burst of cell division when the filaments were shifted to the permissive temperature (39 degrees C). None of the various agents that stimulate cell division in other mutant systems (salt, sucrose, ethanol, and chloramphenicol) was very effective in restoring colony-forming ability at 25 degrees C or in stimulating cell division in broth. One of these mutants, strain JS10, was found to have an altered cell envelope as evidenced by increased sensitivity to deoxycholate and antibiotics, as well as leakage of ribonulcease I, a periplasmic enzyme. This mutant had normal rates of DNA synthesis, RNA synthesis, and phospholipid synthesis at both the nonpermissive and permissive temperatures. However, strain JS10 required new protein synthesis in the apparent absence of new RNA synthesis for division of filaments at the permissive temperature. The division of lesion in strain JS10 is cotransducible with malA, aroB, and glpD and maps within min 72 to 75 on the E. coli chromosome.

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Selected References

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