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3.E.1.6.3
Gloeobacter rhodopsin (GT) of 298 aas and 7 TMSs (associates with salinixanthin, the light-harvesting carotenoid antenna of xanthorhodopsin) (Imasheva et al., 2009Hashimoto et al., 2010).  Expression in a chemotrophic E. coli enabled light-driven phototrophic energy generation (Kim et al. 2017). The X-ray crystallographic structure and oligomeric state have been described (Morizumi et al. 2019). The structural characteristics of GR's hydrogen bonding network in the transmembrane domain as well as the displacement of extracellular sides of the TMS resemble those of XR. The pH-dependent pentamer form of GR was documented. Structural motifs (extended helices, 3-omega motif and flipped B-C loop) typical of other characterized rhodopsins, were also identified (Morizumi et al. 2019).

Accession Number:Q7NP59
Protein Name:Gll0198 protein
Length:298
Molecular Weight:32289.00
Species:Gloeobacter violaceus [33072]
Number of TMSs:7
Location1 / Topology2 / Orientation3: Cell inner membrane1 / Multi-pass membrane protein2
Substrate H+

Cross database links:

RefSeq: NP_923144.1   
Entrez Gene ID: 2599983   
Pfam: PF01036   
BioCyc: GVIO251221:GLL0198-MONOMER   
KEGG: gvi:gll0198   

Gene Ontology

GO:0016020 C:membrane
GO:0005216 F:ion channel activity
GO:0006811 P:ion transport

References (1)

[1] “Complete genome structure of Gloeobacter violaceus PCC 7421, a cyanobacterium that lacks thylakoids.”  Nakamura Y.et.al.   14621292
Structure:
6NWD     

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Predict TMSs (Predict number of transmembrane segments)
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FASTA formatted sequence
1:	MLMTVFSSAP ELALLGSTFA QVDPSNLSVS DSLTYGQFNL VYNAFSFAIA AMFASALFFF 
61:	SAQALVGQRY RLALLVSAIV VSIAGYHYFR IFNSWDAAYV LENGVYSLTS EKFNDAYRYV 
121:	DWLLTVPLLL VETVAVLTLP AKEARPLLIK LTVASVLMIA TGYPGEISDD ITTRIIWGTV 
181:	STIPFAYILY VLWVELSRSL VRQPAAVQTL VRNMRWLLLL SWGVYPIAYL LPMLGVSGTS 
241:	AAVGVQVGYT IADVLAKPVF GLLVFAIALV KTKADQESSE PHAAIGAAAN KSGGSLIS