Archaeal/bacterial/fungal rhodopsins (IPR001425)

Short name: Arc/bac/fun_rhodopsins

Overlapping homologous superfamilies


Family relationships

  • Archaeal/bacterial/fungal rhodopsins (IPR001425)


Bacterial rhodopsins are a family of bacterial opsins. They are retinal-binding proteins that provide light-dependent ion transport and sensory functions to a family of halophilic bacteria [PMID: 2468194, PMID: 2591367]. They are integral membrane proteins believed to contain seven transmembrane (TM) domains, the last of which contains the attachment point for retinal binding (a conserved lysine).

The archaeal/bacterial/fungal rhodopsin family includes bacteriorhodopsin and archaerhodopsin, which are light-driven proton pumps; halorhodopsin, a light-driven chloride pump; and sensory rhodopsin, which mediates both photoattractant (in the red) and photophobic (in the UV) responses. This family also includes distantly related proteins that do not contain the retinal binding lysine and so cannot function as opsins.

GO terms

Biological Process

GO:0006811 ion transport

Molecular Function

GO:0005216 ion channel activity

Cellular Component

GO:0016020 membrane

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.