title: SigB, an alternative sigma factor of the myxobacterium Stigmatella aurantiaca, is synthesized during development and heat shock.
abstract: Alternative sigma factors have been detected in the myxobacterium Stigmatella aurantiaca during indole-induced sporulation, fruiting body formation and heat shock using an antiserum raised against sigma factor SigB. The time course of sigB gene expression was analysed by RT-PCR and by determining beta-galactosidase activity during development in a merodiploid strain that harboured a sigB-lacZ fusion gene. Inactivation of the sigB gene by insertion of the neo gene resulted in the loss of one sigma factor as shown by Western analysis. Neither fruiting body formation nor sporulation, nor the production of possible SigB targets, such as DnaK, GroEL or HspA, were affected.
authors.affiliation: ZMBH, Zentrum für Molekulare Biologie der Universität Heidelberg, Im Neuenheimer Feld 282, D-69120 Heidelberg, Germany1.
authors.forename: Barbara
authors.initials: B
authors.lastname: Silakowski
authors.affiliation: ZMBH, Zentrum für Molekulare Biologie der Universität Heidelberg, Im Neuenheimer Feld 282, D-69120 Heidelberg, Germany1.
authors.forename: Susanne
authors.initials: S
authors.lastname: Müller
authors.affiliation: ZMBH, Zentrum für Molekulare Biologie der Universität Heidelberg, Im Neuenheimer Feld 282, D-69120 Heidelberg, Germany1.
authors.forename: Heyko
authors.initials: H
authors.lastname: Skladny
authors.affiliation: ZMBH, Zentrum für Molekulare Biologie der Universität Heidelberg, Im Neuenheimer Feld 282, D-69120 Heidelberg, Germany1.
authors.forename: Heidi
authors.initials: H
authors.lastname: Ehret
authors.affiliation: ZMBH, Zentrum für Molekulare Biologie der Universität Heidelberg, Im Neuenheimer Feld 282, D-69120 Heidelberg, Germany1.
authors.forename: Hans U
authors.initials: HU
authors.lastname: Schairer
mesh_terms: D001426:Bacterial Proteins / Q000096:biosynthesis* / Q000235:genetics; D001483:Base Sequence; D015964:Gene Expression Regulation, Bacterial; D006360:Heat-Shock Proteins / Q000378:metabolism; D006358:Hot Temperature; D008969:Molecular Sequence Data; D009154:Mutation; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012808:Sigma Factor / Q000096:biosynthesis* / Q000235:genetics; D013171:Spores, Bacterial / Q000235:genetics / Q000378:metabolism*; D020606:Stigmatella aurantiaca / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D014158:Transcription, Genetic
chemical_list: D001426:Bacterial Proteins; D006360:Heat-Shock Proteins; C079011:SigB protein, Bacteria; D012808:Sigma Factor