Open AccessThe pss and psd genes are required for motility and chemotaxis in Escherichia coli
Author(s) -
Wenyuan Shi,
Mikhail Bogdanov,
William Dowhan,
David R. Zusman
Publication year - 1993
Publication title -
journal of bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.652
H-Index - 246
eISSN - 1067-8832
pISSN - 0021-9193
DOI - 10.1128/jb.175.23.7711-7714.1993
Subject(s) - operon , biology , chemotaxis , phosphatidylserine , flagellum , phosphatidylethanolamine , mutant , motility , escherichia coli , regulon , flagellin , sigma factor , microbiology and biotechnology , gene , biochemistry , phospholipid , membrane , phosphatidylcholine , rna polymerase , receptor
Mutants of Escherichia coli defective in phosphatidylserine synthase (encoded by pss) and phosphatidylserine decarboxylase (encoded by psd) make cell membranes deficient in phosphatidylethanolamine. In this report we show that wild-type pss and psd genes are required for motility and chemotaxis. Null mutants or strains with temperature-sensitive pss or psd mutations grown at high temperature (35 degrees C) were nonmotile. They lacked flagella and showed reduced rates of transcription of the flhD master operon (encoding FlhD and FlhC), the fliA operon (encoding sigma F), and the fliC operon (encoding flagellin). At low temperature (25 degrees C), the temperature-sensitive mutant cells showed motility and chemotaxis but at reduced levels. The extent of the motility and chemotaxis defects in the mutants was correlated with the amount of phosphatidylethanolamine in the membranes, suggesting a link between membrane phospholipid composition and expression of the flagellum chemotaxis regulon.