Scramblase Activity of Proteorhodopsin Confers Physiological Advantages to in the Absence of Light

Overview

Journal iScience

Publisher Cell Press

Date 2023 Dec 21

PMID 38125024

Authors

Jiayu Fang

Yanping Zhang

Taicheng Zhu

Yin Li

Affiliations

Soon will be listed here.

Abstract

Microbial rhodopsins are widely distributed in the aqua-ecosystem due to their simple structure and multifaceted functions. Conventionally, microbial rhodopsins are considered to be exclusively light active. Here, we report the discovery of light-independent function of a proteorhodopsin from a psychrophile (ptqPR). ptqPR could improve the growth and viability of cells under stressful conditions in the absence of light, and this was achieved by improving the energy maintenance, membrane potential, membrane fluidity, and membrane integrity. We further show that this non-canonical function of PR is related to its scramblase activity. PR mutants which lost scramblase activities also lost their ability to confer physiological advantages in . . These findings shed light on why microbial rhodopsins are widely distributed in ecological systems where light is inaccessible.

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