Direct Electron Transfer between the frhAGB-Encoding Hydrogenase and Thioredoxin Reductase in a Non-Methanogenic Archaeon Thermococcus onnurnieus NA1

Title
Direct Electron Transfer between the frhAGB-Encoding Hydrogenase and Thioredoxin Reductase in a Non-Methanogenic Archaeon Thermococcus onnurnieus NA1
Author(s)
정해창; 임재규; 양태준; 강성균; 이현숙
KIOST Author(s)
Jung, Hae Chang(정해창)Kang, Sung Gyun(강성균)Lee, Hyun Sook(이현숙)
Publication Year
2019-04-19
Abstract
The thioredoxin reductase (TrxR) of the hyperthermophilic archaeon T. onnurineus NA1 is known to be an NADP-dependent enzyme that uses NAD(P)H as an electron donor. In this study, we demonstrate that electrons generated via hydrogenase-mediated H2 oxidation can be utilized by TrxR directly without the use of other electron carriers. The frhAGB-encoding hydrogenase, a homolog of the F420-reducing hydrogenase of methanogens, that lacks F420-reducing activity, was shown to interact with TrxR in coimmunoprecipitation experiments and in vitro pull-down assays. Furthermore, the transfer of electrons from H2 between the frhAGB-encoding hydrogenase and TrxR was demonstrated by reduction of a redox partner of TrxR, Pdo, identified in the redox cascades of T. onnurineus NA1. Interaction and electron transfer were observed between TrxR and the heterodimeric (FrhAG) hydrogenase complex as well as the heterotrimeric complex (FrhAGB). This study revealed the functionality of the frhAGB-encoding hydrogenase in a non-methanogen and provided insight into the mechanism underlying electron transfer by the hydrogenase to a target in the absence of the F420 cofactor.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/22769
Bibliographic Citation
MSK2019/International Meeting of ther Microbiological Society of Korea, pp.176, 2019
Publisher
한국미생물학회/ The Microbiological Society of Korea
Type
Conference
Language
English
Publisher
한국미생물학회/ The Microbiological Society of Korea
Related Researcher
Research Interests

Microbial biotechnology,Marine enzymes,미생물 활용,효소 개발

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