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Deciphering the in vivo redox behavior of human peroxiredoxins I and II by expressing in budding yeast.

DIR@IMTECH: CSIR-Institute of Microbial Technology

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Title Deciphering the in vivo redox behavior of human peroxiredoxins I and II by expressing in budding yeast.
 
Creator Kumar, Rakesh
Mohammad, Ashu
Saini, Reena V
Chahal, Anterpreet
Wong, Chi-Ming
Sharma, Deepak
Kaur, Sukhvir
Kumar, Vikas
Winterbourn, Christine C
Saini, Adesh K
 
Subject QR Microbiology
 
Description Peroxiredoxins (Prxs), scavenge cellular peroxides by forming recyclable disulfides but under high oxidative stress, hyperoxidation of their active-site Cys residue results in loss of their peroxidase activity. Saccharomyces cerevisiae deficient in human Prx (hPrx) orthologue TSA1 show growth defects under oxidative stress. They can be complemented with hPRXI but not by hPRXII, but it is not clear how the disulfide and hyperoxidation states of the hPrx vary in yeast under oxidative stress. To understand this, we used oxidative-stress sensitive tsa1tsa2Δ yeast strain to express hPRXI or hPRXII. We found that hPrxI in yeast exists as a mixture of disulfide-linked dimer and reduced monomer but becomes hyperoxidized upon elevated oxidative stress as analyzed under denaturing conditions (SDS-PAGE). In contrast, hPrxII was present predominantly as the disulfide in unstressed cells and readily converted to its hyperoxidized, peroxidase-inactive form even with mild oxidative stress. Interestingly, we found that plant extracts containing polyphenol antioxidants provided further protection against the growth defects of the tsa1tsa2Δ strain expressing hPrx and preserved the peroxidase-active forms of the Prxs. The extracts also helped to protect against hyperoxidation of hPrxs in HeLa cells. Based on these findings we can conclude that resistance to oxidative stress of yeast cells expressing individual hPrxs requires the hPrx to be maintained in a redox state that permits redox cycling and peroxidase activity. Peroxidase activity decreases as the hPrx becomes hyperoxidized and the limited protection by hPrxII compared with hPrxI can be explained by its greater sensitivity to hyperoxidation.
 
Publisher Elsevier
 
Date 2019-12
 
Type Article
PeerReviewed
 
Relation https://linkinghub.elsevier.com/retrieve/pii/S0891-5849(18)31109-2
http://crdd.osdd.net/open/2486/
 
Identifier Kumar, Rakesh and Mohammad, Ashu and Saini, Reena V and Chahal, Anterpreet and Wong, Chi-Ming and Sharma, Deepak and Kaur, Sukhvir and Kumar, Vikas and Winterbourn, Christine C and Saini, Adesh K (2019) Deciphering the in vivo redox behavior of human peroxiredoxins I and II by expressing in budding yeast. Free radical biology & medicine, 145. pp. 321-329. ISSN 1873-4596