Sodium dodecyl sulfate hypersensitivity of clpP and clpB mutants of Escherichia coli.
We studied the hypersensitivity of clpP and clpB mutants of Escherichia coli to sodium dodecyl sulfate (SDS). Both wild-type E. coli MC4100 and lon mutants grew in the presence of 10% SDS, whereas isogenic clpP and clpB single mutants could not grow above 0.5% SDS and clpA and clpX single mutants could not grow above 5.0% SDS. For wild-type E. coli, cellular ClpP levels as determined by Western immunoblot analysis increased ca. sixfold as the levels of added SDS increased from 0 to 2%. Capsular colanic acid, measured as uronic acid, increased ca. sixfold as the levels of added SDS increased from 2 to 10%. Based on these findings, 3 of the 19 previously identified SDS shock proteins (M. Adamowicz, P. M. Kelley, and K. W. Nickerson, J. Bacteriol. 173:229-233, 1991) are tentatively identified as ClpP, ClpX, and ClpB.
Rajagopal
Soumitra
S
School of Biological Sciences, University of Nebraska, Lincoln, Nebraska 68588-0666, USA.
Sudarsan
Narasimhan
N
Nickerson
Kenneth W
KW
D000074183:ATPases Associated with Diverse Cellular Activities; D000251:Adenosine Triphosphatases / Q000235:genetics* / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D003470:Culture Media; D024881:Drug Resistance, Bacterial; D049071:Endopeptidase Clp; D004926:Escherichia coli / Q000187:drug effects* / Q000235:genetics / Q000254:growth & development; D029968:Escherichia coli Proteins; D006360:Heat-Shock Proteins / Q000235:genetics* / Q000378:metabolism; D018832:Molecular Chaperones; D009154:Mutation; D012697:Serine Endopeptidases / Q000235:genetics* / Q000378:metabolism; D012967:Sodium Dodecyl Sulfate / Q000494:pharmacology*; D013501:Surface-Active Agents / Q000494:pharmacology*
D001426:Bacterial Proteins; D003470:Culture Media; D029968:Escherichia coli Proteins; D006360:Heat-Shock Proteins; D018832:Molecular Chaperones; D013501:Surface-Active Agents; D012967:Sodium Dodecyl Sulfate; D012697:Serine Endopeptidases; C483568:ClpA protease, E coli; D049071:Endopeptidase Clp; D000251:Adenosine Triphosphatases; C088072:ClpX protein, E coli; D000074183:ATPases Associated with Diverse Cellular Activities