The Escherichia coli htrP gene product is essential for bacterial growth at high temperatures: mapping, cloning, sequencing, and transcriptional regulation of htrP.
We identified and characterized a new Escherichia coli gene, htrP. The htrP gene was identified because its insertional inactivation by the Tn10 transposon results in the inability of E. coli to form colonies at temperatures above 37 degrees C and a slow growth phenotype at 30 degrees C. The htrP gene was cloned and mapped to 66.3 min on the E. coli genetic map, 4 kbp clockwise from the tolC gene. The htrP gene was sequenced and shown to code for an acidic, 27,471-Da polypeptide and to be transcribed counterclockwise with respect to the genetic map. The predicted HtrP protein has two potential transmembrane segments and shares an identity of 64.4% over a length of 210 amino acids with the LuxH protein. Despite the fact that the htrP gene is essential for E. coli growth exclusively at high temperatures, the levels of htrP-specific transcripts decrease with increasing temperature.
Department of Cellular, Viral and Molecular Biology, University of Utah School of Medicine, Salt Lake City 84132.
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Georgopoulos
D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification; D001483:Base Sequence; D003001:Cloning, Molecular; D004926:Escherichia coli / Q000235:genetics* / Q000254:growth & development; D029968:Escherichia coli Proteins; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D006360:Heat-Shock Proteins / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification; D019751:Intramolecular Transferases; D007525:Isoelectric Focusing; D007763:Lac Operon; D008969:Molecular Sequence Data; D016254:Mutagenesis, Insertional; D011401:Promoter Regions, Genetic; D015183:Restriction Mapping; D012689:Sequence Homology, Nucleic Acid; D013696:Temperature; D014158:Transcription, Genetic
D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D006360:Heat-Shock Proteins; C071147:ribB protein, E coli; D019751:Intramolecular Transferases