Summary
For almost four decades, bacteriorhodopsin has served as a classic example of the simplest standalone proton gradient generator. Bacteriorhodopsin-based bioenergetics was viewed as the most basic type of photosynthesis, becoming useful under limiting oxygen conditions only in a small group of extremophilic haloarchaea. With the advent of genomic and metagenomic high-throughput sequencing, the taxonomic and ecological diversity of bacteriorhodopsin-related proteins (microbial rhodopsins) appeared to be large. In this chapter, we survey structural and taxonomic diversity of proton-pumping microbial rhodopsins, describing haloarchaeal, fungal, algal, and eubacterial representatives, including those in photosynthetic organisms. Comparison of both primary and 3-D structures is made, and common structural trends are pointed out. Finally, we outline the main structural blocks involved in light-driven proton-transport mechanism, and discuss its conserved and variable parts.
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Abbreviations
- ACR-2:
-
– Acetabularia rhodopsin-2;
- AR:
-
– Archaerhodopsin;
- BR:
-
– Bacteriorhodopsin;
- GPR:
-
– Green-absorbing proteorhodopsin;
- GR:
-
– Gloeobacter rhodopsin;
- PR:
-
– Proteorhodopsin;
- RD:
-
– Rhodopsin;
- TM:
-
– Transmembrane;
- XR:
-
– Xanthorhodopsin
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This work is supported by Natural Sciences and Engineering Research Council of Canada and the University of Guelph.
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Brown, L.S. (2014). Proton-Pumping Microbial Rhodopsins – Ubiquitous Structurally Simple Helpers of Respiration and Photosynthesis. In: Hohmann-Marriott, M. (eds) The Structural Basis of Biological Energy Generation. Advances in Photosynthesis and Respiration, vol 39. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-8742-0_1
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