Abstract
Göbel etal. present in this issue an exemplary study of identification of chromophores from Arabidopsis thaliana cryptochrome-3. Usually taken for granted, proteins and cofactors, respective chromophores, from heterologous expression are considered identical to material isolated from their genuine host. Cryptochromes carry two chromophores, an antenna cofactor and a functional flavin chromophore, both noncovalently embedded into the protein. In particular the antenna chromophore is loosely bound and often lost during protein purification. The authors identify from plant-extracted Cry3 unambiguously N5 ,N10 -methenyltetrahydrofolate as antenna chromophore and flavin adenine dinucleotide as the functional chromophore.
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