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Light and dark adaptation of halorhodopsin.

Abstract：

:Dark incubation of envelope vesicles derived from a strain of Halobacterium halobium that lacks bacteriorhodopsin but contains halorhodopsin and a third rhodopsin-like pigment caused a decrease in the flash yield [the amplitude of a transient absorbance change of flash reactive component(s) by flash] of halorhodopsin but not the rhodopsin-like pigment. The flash yield decreased to reach a low steady level after incubation for about 4 days in the dark. The flash yield of halorhodopsin at any stage of dark incubation was increased by actinic illumination of the vesicles. The flash yield at 490 nm (absorbance increase) was found to be approximately proportional to that at 590 nm (absorbance decrease). These results indicate that halorhodopsin in the envelope vesicles has two forms, dark and light adapted, and that the halorhodopsin phototransient absorbing at 490 nm is originated from the light-adapted form. A difference spectrum between these two forms of halorhodopsin shows that the light-adapted halorhodopsin was red-shifted from the dark-adapted form. The light-induced membrane potential was measured by tetraphenylphosphonium uptake. The uptake by the dark-adapted vesicles was slower than that by the light-adapted vesicles, suggesting that only the light-adapted halorhodopsin has ion-transporting activity.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Kamo N,Hazemoto N,Kobatake Y,Mukohata Y

doi

10.1016/0003-9861(85)90144-4

subject

Has Abstract

pub_date

1985-04-01 00:00:00

pages

90-6

issue

1

eissn

0003-9861

issn

1096-0384

pii

0003-9861(85)90144-4

journal_volume

238

pub_type

杂志文章

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