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. Author manuscript; available in PMC: 2017 Dec 29.
Published in final edited form as: Annu Rev Biochem. 2017 Mar 9;86:845–872. doi: 10.1146/annurev-biochem-101910-144233

Figure 2.

Figure 2

Functional types of microbial rhodopsins. For molecules shown as ribbons high-resolution crystal structures have been obtained. Abbreviations: BRs, bacteriorhodopsins; PRs, proteorhodopsins; HRs, halorhodopsins; NaRs, Na+-pumping rhodopsins; SRs, sensory rhodopsins; ASR, Anabaena sensory rhodopsin; ER, enzymerhodopsins; CCRs, cation channelrhodopsins; ACRs, anion channelrhodopsins; eukar., eukaryotic; eubact., eubacterial; HK, histidine kinase; GC, gunanylyl cyclase; CD, cytoplasmic domain.