Fig. 4From: Disruption of zinc finger DNA binding domain in catabolite repressor Mig1 increases growth rate, hyphal branching, and cellulase expression in hypercellulolytic fungus Penicillium funiculosum NCIM1228CCR is disrupted in PfMig188. Graphical representation of a Mig188 cassette constructed for homologous recombination and cloned in pCambia1302, and b Truncated Mig188 protein. c PCR amplification products using Mig1 flanking primers. Lane 1 represents DNA ladder, Lane 2 shows amplification of 2248-bp fragment indicating native Mig1 gene and flanking sequence of NCIM1228, and Lane 3 shows amplification of 3035-bp fragment using P1 and P2 primers indicating homologous recombination of PfMig188 cassette leading to loss of native Mig1 sequence. d RACE experiments to confirm the replacement of native gene with Mig188 at RNA level. Lane 1 represents DNA ladder, Lane 2 shows amplification of 1248-bp band representing full-length Mig1 RNA in NCIM1228 and no amplification in Lane 3 shows its absence in PfMig188 transformant, Lanes 4 and 5 represent 5′ RACE where 253-bp fragment from 5′ end of Mig1 RNA was amplified in both NCIM1228 and PfMig188, and Lanes 6 and 7 represent 3′ RACE where NCIM1228 shows amplification of 319-bp fragment representing intact 3′-end of Mig1 RNA, whereas failed 3′ RACE in PfMig188 shows truncated Mig188 RNA. 1-kb Plus DNA ladder (Fermentas) was used as DNA marker. Conidiospores of NCIM1228 and PfMig188 were spotted on e SC media having 2% Avicel in the absence and presence of 0.5% 2-DG, where PfMig188 was found resistant to 2-DG, and on f SC media having 2% glucose in the absence and presence of 1 mM AA, where PfMig188 was found sensitive to 1 mM AABack to article page