- Carotenoid desaturases from Rhodobacter capsulatus and Neurospora crassa are structurally and functionally conserved and contain domains homologous to flavoprotein disulfide oxidoreductases. Bartley, G.E., Schmidhauser, T.J., Yanofsky, C., Scolnik, P.A. J. Biol. Chem. (1990)