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Coenzyme B12 (AdoCbl; 5′‐deoxy‐5′‐adenosylcobalamin), the quintessential biological organometallic radical catalyst, has a formerly unanticipated, yet extensive, role in photoregulation in bacteria. The light‐responsive cobalt‐corrin AdoCbl performs this nonenzymatic role by facilitating the assembly of CarH photoreceptors into DNA‐binding tetramers in the dark, suppressing gene expression. Conversely,...
Coenzyme B12 (AdoCbl; 5′‐deoxy‐5′‐adenosylcobalamin), the quintessential biological organometallic radical catalyst, has a formerly unanticipated, yet extensive, role in photoregulation in bacteria. The light‐responsive cobalt‐corrin AdoCbl performs this nonenzymatic role by facilitating the assembly of CarH photoreceptors into DNA‐binding tetramers in the dark, suppressing gene expression. Conversely,...