TY - JOUR
T1 - Role of Bordetella pertussis RseA in the cell envelope stress response and adenylate cyclase toxin release
AU - Hanawa, Tomoko
AU - Yonezawa, Hideo
AU - Kawakami, Hayato
AU - Kamiya, Shigeru
AU - Armstrong, Sandra K.
PY - 2013/10
Y1 - 2013/10
N2 - Bordetella pertussis is the bacterial agent of the human disease such as whooping cough. In many bacteria, the extracellular function sigma factor σE is central to the response to envelope stress, and its activity is negatively controlled by the RseA anti-sigma factor. In this study, the role of RseA in B. pertussis envelope stress responses was investigated. Compared with the wild-type strain, an rseA mutant showed elevated resistance to envelope stress and enhanced growth at 25 °C. rpoH and other predicted σE target genes demonstrated increased transcription in the rseA mutant compared with the wild-type parent. Transcription of those genes was also increased in wild-type B. pertussis and Escherichia coli under envelope stress, whereas no stress-induced increase in transcription was observed in the rseA mutant. rseA inactivation was also associated with altered levels of certain proteins in culture supernatant fluids, which showed increased adenylate cyclase toxin (CyaA) levels. The increased CyaA in the mutant was correlated with an apparent increased stability of the extracellular toxin and increased production of CyaA-containing outer membrane vesicles. Consistent with this, compared with the wild-type strain, rseA mutant cells produced increased numbers of large surface-associated vesicles.
AB - Bordetella pertussis is the bacterial agent of the human disease such as whooping cough. In many bacteria, the extracellular function sigma factor σE is central to the response to envelope stress, and its activity is negatively controlled by the RseA anti-sigma factor. In this study, the role of RseA in B. pertussis envelope stress responses was investigated. Compared with the wild-type strain, an rseA mutant showed elevated resistance to envelope stress and enhanced growth at 25 °C. rpoH and other predicted σE target genes demonstrated increased transcription in the rseA mutant compared with the wild-type parent. Transcription of those genes was also increased in wild-type B. pertussis and Escherichia coli under envelope stress, whereas no stress-induced increase in transcription was observed in the rseA mutant. rseA inactivation was also associated with altered levels of certain proteins in culture supernatant fluids, which showed increased adenylate cyclase toxin (CyaA) levels. The increased CyaA in the mutant was correlated with an apparent increased stability of the extracellular toxin and increased production of CyaA-containing outer membrane vesicles. Consistent with this, compared with the wild-type strain, rseA mutant cells produced increased numbers of large surface-associated vesicles.
KW - Adenylate cyclase
KW - Bordetella pertussis
KW - Envelope stress
KW - RpoE
KW - RseA
UR - http://www.scopus.com/inward/record.url?scp=84900312614&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84900312614&partnerID=8YFLogxK
U2 - 10.1111/2049-632X.12061
DO - 10.1111/2049-632X.12061
M3 - Article
C2 - 23821542
AN - SCOPUS:84900312614
SN - 2049-632X
VL - 69
SP - 7
EP - 20
JO - Pathogens and Disease
JF - Pathogens and Disease
IS - 1
ER -