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. 1983 Feb;153(2):597–603. doi: 10.1128/jb.153.2.597-603.1983

Molecular cloning and expression of a gene that controls the high-temperature regulon of Escherichia coli.

F C Neidhardt, R A VanBogelen, E T Lau
PMCID: PMC221674  PMID: 6337122

Abstract

The high-temperature production (HTP) regulon of Escherichia coli consists of a set of operons that are induced coordinately by a shift to a high temperature under the control of a single chromosomal gene called htpR or hin. To identify more components of this regulon, the rates of synthesis of many polypeptides resolved on two-dimensional polyacrylamide gels were measured in various strains by pulse-labeling after a temperature shift-up. A total of 13 polypeptides were found to be heat inducible only in cells bearing a normal htpR gene on the chromosome or on a plasmid; on this basis these polypeptides were designated products of the HTP regulon. Several hybrid plasmids that contain segments of the E. coli chromosome in the 75-min region were found to carry the htpR gene. A restriction map of this region was constructed, and selected fragments were subcloned and tested for the ability to complement an htpR mutant. The polypeptides encoded by these fragments were detected by permitting expression in maxicells, minicells, and chloramphenicol-treated cells. Complementation was accompanied by production of a polypeptide having a molecular weight of approximately 33,000. This polypeptide, designated F33.4, was markedly reduced in amount in an htpR mutant expected to contain very little htpR gene product. Polypeptide F33.4 is postulated to be the product of htpR and to be an effector that controls heat induction of the HTP regulon.

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Selected References

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