1P270 Effects of transducer binding on pharaonis halorhodopsin
نویسندگان
چکیده
منابع مشابه
The influence of the halide ions on the photochemical reaction cycle of pharaonis halorhodopsin.
Sodium salt of chloride, bromide and iodide were used to elucidate the effect of the size of the anion on the binding to pharaonis halorhodopsin and its transport during the photocycle of this retinal protein. Spectroscopic titration revealed an apparent strong binding constant of 2 mM for chloride, 0.23 mM for bromide and 5 mM for iodide. In the case of iodide a second, week binding constant o...
متن کاملProperties and photochemistry of a halorhodopsin from the haloalkalophile, Natronobacterium pharaonis.
Pharaonis halorhodopsin is a light-driven transport system for chloride, similarly to the previously described halorhodopsin, but we find that it transports nitrate as effectively as chloride. We studied the photoreactions of the purified, detergent-solubilized pharaonis pigment with a gated multichannel analyzer. At a physiological salt concentration (4 M NaCl), the absorption spectra and rate...
متن کاملRole of Thr218 in the light-driven anion pump halorhodopsin from Natronomonas pharaonis.
Halorhodopsin (HR) is an inward-directed light-driven halogen ion pump, and NpHR is a HR from Natronomonas pharaonis. Unphotolyzed NpHR binds halogen ion in the vicinity of the Schiff base, which links retinal to Lys256. This halogen ion is transported during the photocycle. We made various mutants of Thr218, which is located one half-turn up from the Schiff base to the cytoplasm (CP) channel, ...
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ژورنال
عنوان ژورنال: Seibutsu Butsuri
سال: 2005
ISSN: 0582-4052,1347-4219
DOI: 10.2142/biophys.45.s99_2