Figure 4From: cmdABCDEF, a cluster of genes encoding membrane proteins for differentiation and antibiotic production in Streptomyces coelicolorA3(2)Localization of CmdB protein, characterization of its functional domain, and detection of cmdB transcription. (A) Localization of CmdB protein. Cell lysates of strain M145 and that were treated with 0.5 M KCl or 5 mM EDTA-Na, were centrifuged to obtain supernatants (S) and pellets (P) for Western blotting with CmdB polyclonal antibody. Total cell lysates was a positive control. (B) Mutations of conserved residues in domains of the CmdB protein blocked its function. Plasmid pFX101 derivatives containing the site-mutated cmdB genes were introduced by conjugation into the cmdB null mutant. Strains were grown on MS at 30°C for 3 days. (C) RT-PCR to detect transcription of cmdB. Total RNA was isolated from MS medium grown for 16, 26, 40, 50, 62 and 74 h, and reverse-transcribed into cDNAs for PCR amplification. Transcription of 16S rRNA gene was used as an internal control.Back to article page