Replacement of riboflavin by an analogue in the blue-light photoreceptor of Phycomyces
AUTOR(ES)
Otto, M. K.
RESUMO
Under suitable conditions, roseoflavin [7-methyl-8-dimethylamino-10-(1′-D-ribityl)isoalloxazine] replaces riboflavin to about 80% in the photoreceptor of Phycomyces. The substitute-bearing photoreceptor functions with an efficiency of about 0.1% of that of the normal receptor. The substitution is proven by (i) a decrease of the effective light flux by a factor of 4.7, expressed as a corresponding increase in threshold, and (ii) an increase of the effectiveness of 529-nm light relative to 380-nm light. It has also been shown that roseoflavin is taken up by the mycelium, translocated to the sporangiophore, and effectively phosphorylated by the riboflavin kinase of Phycomyces.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=319033Documentos Relacionados
- Transduction of Blue-Light Signals.
- Blue-light reception in Phycomyces phototropism: evidence for two photosystems operating in low- and high-intensity ranges.
- Kinetic properties of the blue-light response of stomata
- Measurement of retinal blood flow in diabetes by the blue-light entoptic phenomenon.
- Enhancement of blue-light sensitivity of Arabidopsis seedlings by a blue light receptor cryptochrome 2