Glutaredoxin Interacts with GR and AhpC to Enhance Low-Temperature Tolerance of Antarctic Psychrophile Psychrobacter sp. ANT206

Glutaredoxin (Grx) is an important oxidoreductase to maintain the redox homoeostasis of cells. In our previous study, cold-adapted Grx from Psychrobacter sp. ANT206 (PsGrx) has been characterized. Here, we constructed an in-frame deletion mutant of psgrx (Δ psgrx ). Mutant Δ psgrx was more sensitive...

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Bibliographic Details
Published in:International Journal of Molecular Sciences
Main Authors: Yatong Wang, Quanfu Wang, Yanhua Hou, Jianan Liu
Format: Article in Journal/Newspaper
Language:English
Published: MDPI AG 2022
Subjects:
antarctic
glutaredoxin
deletion mutant
oxidative stress
yeast two-hybrid
BiFC
Biology (General)
QH301-705.5
Chemistry
QD1-999
Antarctic
Antarc*
Online Access:https://doi.org/10.3390/ijms23031313
https://doaj.org/article/416c1f9c5b004c42ac803dce44114d61
Description
Summary:Glutaredoxin (Grx) is an important oxidoreductase to maintain the redox homoeostasis of cells. In our previous study, cold-adapted Grx from Psychrobacter sp. ANT206 (PsGrx) has been characterized. Here, we constructed an in-frame deletion mutant of psgrx (Δ psgrx ). Mutant Δ psgrx was more sensitive to low temperature, demonstrating that psgrx was conducive to the growth of ANT206. Mutant Δ psgrx also had more malondialdehyde (MDA) and protein carbonylation content, suggesting that PsGrx could play a part in the regulation of tolerance against low temperature. A yeast two-hybrid system was adopted to screen interacting proteins of 26 components. Furthermore, two target proteins, glutathione reductase (GR) and alkyl hydroperoxide reductase subunit C (AhpC), were regulated by PsGrx under low temperature, and the interactions were confirmed via bimolecular fluorescence complementation (BiFC) and co-immunoprecipitation (Co-IP). Moreover, PsGrx could enhance GR activity. trxR expression in Δ psgrx , Δ ahpc, and ANT206 were illustrated 3.7, 2.4, and 10-fold more than mutant Δ psgrx Δ ahpc , indicating that PsGrx might increase the expression of trxR by interacting with AhpC. In conclusion, PsGrx may participate in glutathione metabolism and ROS-scavenging by regulating GR and AhpC to protect the growth of ANT206. These findings preliminarily suggest the role of PsGrx in the regulation of oxidative stress, which could improve the low-temperature tolerance of ANT206.

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