Light regulation of resistance to oxidative damage and magnetic crystal biogenesis in Magnetospirillum magneticum mediated by a Cys-less LOV-like protein - Archive ouverte HAL Access content directly
Journal Articles Applied Microbiology and Biotechnology Year : 2020

Light regulation of resistance to oxidative damage and magnetic crystal biogenesis in Magnetospirillum magneticum mediated by a Cys-less LOV-like protein

(1, 2) , (2) , (2) , (2) , (3) , (4) , (2)
1
2
3
4

Abstract

Light–oxygen–voltage (LOV) proteins are ubiquitous photoreceptors that can interact with other regulatory proteins and then mediate their activities, which results in cellular adaptation and subsequent physiological changes. Upon blue-light irradiation, a conserved cysteine (Cys) residue in LOV covalently binds to flavin to form a flavin–Cys adduct, which triggers a subsequent cascade of signal transduction and reactions. We found a group of natural Cys-less LOV-like proteins in magnetotactic bacteria (MTB) and investigated its physiological functions by conducting research on one of these unusual LOV-like proteins, Amb2291, in Magnetospirillum magneticum. In-frame deletion of amb2291 or site-directive substitution of alanine-399 for Cys mutants impaired the protective responses against hydrogen peroxide, thereby causing stress and growth impairment. Consequently, gene expression and magnetosome formation were affected, which led to high sensitivity to oxidative damage and defective phototactic behaviour. The purified wild-type and A399C-mutated LOV-like proteins had similar LOV blue-light response spectra, but Amb2291A399C exhibited a faster reaction to blue light. We especially showed that LOV-like protein Amb2291 plays a role in magnetosome synthesis and resistance to oxidative stress of AMB-1 when this bacterium was exposed to red light and hydrogen peroxide. This finding expands our knowledge of the physiological function of this widely distributed group of photoreceptors and deepens our understanding of the photoresponse of MTB.
Fichier principal
Vignette du fichier
20201220manuscript LOV.pdf (2.28 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

hal-02993019 , version 1 (23-06-2021)

Identifiers

Cite

Haitao Chen, Kefeng Li, Yao Cai, Pingping Wang, Weimin Gong, et al.. Light regulation of resistance to oxidative damage and magnetic crystal biogenesis in Magnetospirillum magneticum mediated by a Cys-less LOV-like protein. Applied Microbiology and Biotechnology, 2020, 104 (18), pp.7927-7941. ⟨10.1007/s00253-020-10807-5⟩. ⟨hal-02993019⟩

Collections

CNRS UNIV-AMU
58 View
175 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More