Characterization of retinal chromophore and protonated Schiff base in Thermoplasmatales archaeon heliorhodopsin using solid-state NMR spectroscopy
Heliorhodopsin (HeR) is a seven-helical transmembrane protein with a retinal chromophore that corresponds to a new rhodopsin family. HeR from the archaebacterium Thermoplasmatales archaeon (TaHeR) exhibits unique features, such as the inverted protein orientation in the membrane compared to other rhodopsins and a long photocycle. Here, we used solid-state nuclear magnetic resonance (NMR) spectroscopy to investigate the ^(13)C and ^(15)N NMR signals of the retinal chromophore and protonated...
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