7BMH

Crystal structure of a light-driven proton pump LR (Mac) from Leptosphaeria maculans

Summary for 7BMH

• Entry DOI: 10.2210/pdb7bmh/pdb
• Descriptor: Opsin, EICOSANE, OLEIC ACID, ... (4 entities in total)
• Functional Keywords: rhodopsin, bacteriorhodopsin, retinal, optogenetics, proton pump, photocycle, eukaryotic rhodopsin, ion transport, membrane protein
• Biological source: Leptosphaeria maculans (Blackleg fungus)
• Total number of polymer chains: 2
• Total formula weight: 85785.54

Authors

Kovalev, K.,Zabelskii, D.,Dmitrieva, N.,Volkov, O.,Shevchenko, V.,Astashkin, R.,Zinovev, E.,Gordeliy, V. (deposition date: 2021-01-20, release date: 2021-07-07, Last modification date: 2024-01-31)

Primary citation

Zabelskii, D.,Dmitrieva, N.,Volkov, O.,Shevchenko, V.,Kovalev, K.,Balandin, T.,Soloviov, D.,Astashkin, R.,Zinovev, E.,Alekseev, A.,Round, E.,Polovinkin, V.,Chizhov, I.,Rogachev, A.,Okhrimenko, I.,Borshchevskiy, V.,Chupin, V.,Buldt, G.,Yutin, N.,Bamberg, E.,Koonin, E.,Gordeliy, V.
Structure-based insights into evolution of rhodopsins.
Commun Biol, 4:821-821, 2021

PubMed Abstract: Rhodopsins, most of which are proton pumps generating transmembrane electrochemical proton gradients, span all three domains of life, are abundant in the biosphere, and could play a crucial role in the early evolution of life on earth. Whereas archaeal and bacterial proton pumps are among the best structurally characterized proteins, rhodopsins from unicellular eukaryotes have not been well characterized. To fill this gap in the current understanding of the proton pumps and to gain insight into the evolution of rhodopsins using a structure-based approach, we performed a structural and functional analysis of the light-driven proton pump LR (Mac) from the pathogenic fungus Leptosphaeria maculans. The first high-resolution structure of fungi rhodopsin and its functional properties reveal the striking similarity of its membrane part to archaeal but not to bacterial rhodopsins. We show that an unusually long N-terminal region stabilizes the protein through direct interaction with its extracellular loop (ECL2). We compare to our knowledge all available structures and sequences of outward light-driven proton pumps and show that eukaryotic and archaeal proton pumps, most likely, share a common ancestor.

PubMed: 34193947
DOI: 10.1038/s42003-021-02326-4

Experimental method

X-RAY DIFFRACTION (2.2 Å)