GTP-Binding Proteins are Potential Messengers for Photosygnal Transduction in High Plants

摘要

The effect of special analog of GTP -Gpp(NH)p (Guanylyl(βγ-imido)diphosphate) on the activities of adenylylcyclase (AC) and guanylylcyclase (GC) isolated from etiolated sorghum seedlings was studied. The investigation revealed that Gpp(NH)p activates only that adenylylcyclase which isolated from irradiated by red light seedlings, but adenylylcyclase isolated from etiolated seedlings hasn't reacted on the action of Gpp(NH)p. In contrast to adenylylcyclase the guanylylcyclase isolated from irradiated by red light sorghum seedlings negatively reacted to the action of Gpp(NH)p. Obtained results supports the idea that G-proteins are potential transducers for transduction of photosygnals downstream of plant photoreceptors phytochromes.