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  • Title: Structure of a novel flavin chromophore from Avena coleoptiles, the possible 'blue light' photoreceptor.
    Author: Ghisla S, Mack R, Blankenhorn G, Hemmerich P, Krienitz E, Kuster T.
    Journal: Eur J Biochem; 1984 Jan 16; 138(2):339-44. PubMed ID: 6697990.
    Abstract:
    A yellow chromophore has been isolated from Avena coleoptiles grown in the dark. It had previously been shown by Zenk [Zenk, M. H. (1967) Z. Pflanzenphysiol. 56, 122 - 140] to be a flavin of still unidentified structure, and had been suggested to be the 'blue light' photoreceptor in this organism. The structure of this flavin (F1-X) has been identified as 5'-malonylriboflavin by a combination of physicochemical techniques, and by its identity with a sample obtained synthetically. The 5'-malonylester linkage is relatively labile towards hydrolysis and photolysis, it isomerizes to an equilibrium mixture containing probably the 4' isomer. The electronic spectra of 5'-malonylriboflavin (absorption and fluorescence) are practically identical to those of normal riboflavin (vitamin B2).
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