Figure 6.

Proposed model for the regulation of alginate utilization by AusR in Zobellia galactanivorans Dsij^T. The repression of the AUS promoters by AusR that occurs in the absence of alginate is represented by red arrows. The level of repression estimated from qPCR results (Figure 3) is indicated. The number of AusR operators in each promoter is depicted by red ellipses, together with their distance to the -7 box (no indicated distance means that operators overlap the -7 box). Genes and proteins depicted in grey are those with no or lower direct repression by AusR, allowing basal expression in the absence of alginate.