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What does SRII stand for?

SRII stands for Sensory Rhodopsin I and II

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The blue-light receptor genes (sopII) of sensory rhodopsin (SR) II were cloned from two species, the halophilic bacteria Haloarcula vallismortis (vSR-II) and Natronobacterium pharaonis (pSR-II). Upstream of both sopII gene loci, sequences corresponding to the halobacterial transducer of rhodopsin (Htr) II were recognized. In N. pharaonis, psopII and phtrII are transcribed as a single transcript. Comparison of the amino acid sequences of vHtr-II and pHtr-II with Htr-I and the chemotactic methyl-accepting proteins from Escherichia coli revealed considerable identities in the signal domain and methyl-accepting sites.
We have no indication that ChR1 or ChR2 are coupled to any signal-acceptor protein, like a G protein, or to a transducer, like the archaeal sensory rhodopsins I and II to their respective transducers. This notion is corroborated by the finding that the electrical properties of ChR1 and ChR2 are independent of the large hydrophilic half of the protein, C-terminal of the 7-TM region.
[20] suggested that the different types of rhodopsins were present in the last common ancestor of the haloarchaea, which would suggest that the patchy distribution of rhodopsins observed among these organisms is the result of multiple losses. More recently however, several studies have revealed the genetic mobility of genes encoding type 1 rhodopsins among microbes. The work described here provides at least three highly probable cases of LGT within haloarchaea. These events are sketched in Figure ​Figure55 and briefly discussed below. Note that the sensory rhodopsins.
[18] Like animal visual pigments, these contain a retinal chromophore (although it is an all-trans, rather than 11-cis form) and have seven transmembrane alpha helices; however, they are not coupled to a G protein. Prokaryotic halorhodopsins are light-activated chloride pumps. [18] Unicellular flagellate algae contain channelrhodopsins that act as light-gated cation channels when expressed in heterologous systems. Many other pro- and eukaryotic organisms (in particular, fungi such as Neurospora) express rhodopsin ion pumps or sensory rhodopsins.