Natronomonas pharaonis

Bordignon E, Klare JP, Holterhues J, Martell S, Krasnaberski A, Engelhard M, Steinhoff HJ (2007) Analysis of light-induced conformational changes of Natronomonas pharaonis sensory rhodopsin II by time resolved electron paramagnetic resonance spectroscopy. Photochem Photobiol 83(2) 263-272... 

SRIP). Many laboratories extensively characterized this family of proteins with a battery of diverse techniques, because they provide excellent model systems for the two fundamental functions of membranes active transport and sensory signaling. Twenty-nine variants of BR, HR, SRI, and SRII were documented in related extremely halophlHc archaea, such as Natronomonas pharaonis and Haloarcula vallismortis. Members of the archaeal rhodopsin family were generally assumed to be only in the haloarchaea and appeared to be restricted to the extreme halophilic environments of solar evaporation ponds and other regions of near-saturated salt concentration. 

Natronomonas pharaonis SRII Z35086 Xmax 497 nm, phototaxis (repellent)... 

FIGURE 124.2 Primary sequence comparison of the microbial rhodopsins. (Hs Halobacterium salinarum, Np Natronomonas pharaonis, BR bacteriorhodopsin, SR sensory rhodopsin, PR proteorhodopsin, NR Neurospora rhodopsin, CSRA and CSRB Chlamydomonas sensory rhodopsins A and B) Conserved residues are marked with black boxes, and residues in the retinal-binding pocket are marked with an asterisk. 

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