Linked Life Data

1597180

Source:http://linkedlifedata.com/resource/pubmed/id/1597180

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pubmed-article:1597180pubmed:abstractTextThe phototaxis of Halobacterium halobium is initiated by two photoreceptors, the sensory rhodopsins sR-I and sR-II. An sR-II-like pigment has also been described in Natronobacterium pharaonis. In this work it was shown that N. pharaonis cells are repelled by light with a wavelength of 500 nm. A further comparison of membrane preparations from H. halobium (mutant D1) containing only sR-II and from N. pharaonis [strain SP1(28)] with a chromophoric protein (psR-II) resembling sR-II revealed substantial similarities. The biochemical and photochemical properties of the pigments are quite similar, with psR-II being more stable to external conditions such as pH and ionic strength of the buffer. Both pigments are bleached by low concentrations of hydroxylamine and can be reconstituted by the addition of all-trans-retinal. The absorption spectrum of psR-II is quite similar to sR-II including the shoulder on the short-wavelength side. After light excitation sR-II and psR-II undergo photocycles with at least three intermediates. The earliest intermediate has an absorption maximum above 520 nm and decays to a species which has a characteristic absorption (approximately 380 nm) of a deprotonated Schiff base. The final step is the regeneration of the original ground state via a red-shifted intermediate absorbing around 540 nm. From this cumulative evidence it can be concluded that, not only sR-II, but also the pigment from N. pharaonis is a photophobic photoreceptor.lld:pubmed
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pubmed-article:1597180pubmed:dateRevised2008-11-21lld:pubmed
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pubmed-article:1597180pubmed:articleTitleBiochemical and photochemical properties of the photophobic receptors from Halobacterium halobium and Natronobacterium pharaonis.lld:pubmed
pubmed-article:1597180pubmed:affiliationMax-Planck-Institut für Ernährungsphysiologie, Dortmund, Federal Republic of Germany.lld:pubmed
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