Proteometabolomic Response of Deinococcus Radiodurans Exposed to UVC and Vacuum Conditions: Initial Studies Prior to the Tanpopo Space Mission

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2017 Dec 16

PMID 29244852

Citations 15

Authors

Emanuel Ott

Yuko Kawaguchi

Denise Kolbl

Palak Chaturvedi

Kazumichi Nakagawa

Akihiko Yamagishi

Wolfram Weckwerth

Tetyana Milojevic

Affiliations

Soon will be listed here.

Abstract

The multiple extremes resistant bacterium Deinococcus radiodurans is able to withstand harsh conditions of simulated outer space environment. The Tanpopo orbital mission performs a long-term space exposure of D. radiodurans aiming to investigate the possibility of interplanetary transfer of life. The revealing of molecular machinery responsible for survivability of D. radiodurans in the outer space environment can improve our understanding of underlying stress response mechanisms. In this paper, we have evaluated the molecular response of D. radiodurans after the exposure to space-related conditions of UVC irradiation and vacuum. Notably, scanning electron microscopy investigations showed that neither morphology nor cellular integrity of irradiated cells was affected, while integrated proteomic and metabolomic analysis revealed numerous molecular alterations in metabolic and stress response pathways. Several molecular key mechanisms of D. radiodurans, including the tricarboxylic acid cycle, the DNA damage response systems, ROS scavenging systems and transcriptional regulators responded in order to cope with the stressful situation caused by UVC irradiation under vacuum conditions. These results reveal the effectiveness of the integrative proteometabolomic approach as a tool in molecular analysis of microbial stress response caused by space-related factors.

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