N each cluster co-evolved (results not shown). WhiJ paralogues in S. coelicolor vary considerably in their conservation in other organisms. One (SCO3421) was present in nearly all complex actinomycetes, and the adjacent gene encoding a likely antisigma factor nearly always contained a TTA codon in Streptomycineae (but in no other groups). Another present in all Streptomycineae (SCO4441) was also w
Tively long-established clusters. Twelve other S. coelicolor whiJ-like genes were represented in around half of streptomycetes (SCO2381*, 2865, 2869*, 3365*, 4176, 4301, 4678, 4998, 6129, 6537, 6629*, 7579) [asterisks indicate occurrence also in some other complex actinomycete(s)]; while seven others were found in four or fewer streptomycetes (SCO0704, 2246, 2253, 4543, 5125,Fig. 7. Phylogenetic a
T the direct or indirect targets of WhiJ regulation or about the role of the antisigma-like protein (SCO4544). The apparently repressing action of the whiJ locus raises the possibility that some or all of its paralogues may also act as developmental brakes. If so, it may be that during `normal' colony development on laboratory media, these brakes are all off ?in other words, all relevant checkpoin