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Circadian rhythm of hyperoxidized peroxiredoxin II is determined by hemoglobin autoxidation and the 20S proteasome in red blood cells.

Abstract：

:The catalytic cysteine of the typical 2-Cys Prx subfamily of peroxiredoxins is occasionally hyperoxidized to cysteine sulfinic acid during the peroxidase catalytic cycle. Sulfinic Prx (Prx-SO2H) is reduced back to the active form of the enzyme by sulfiredoxin. The abundance of Prx-SO2H was recently shown to oscillate with a period of ∼24 h in human red blood cells (RBCs). We have now investigated the molecular mechanism and physiological relevance of such oscillation in mouse RBCs. Poisoning of RBCs with CO abolished Prx-SO2H formation, implicating H2O2 produced from hemoglobin autoxidation in Prx hyperoxidation. RBCs express the closely related PrxI and PrxII isoforms, and analysis of RBCs deficient in either isoform identified PrxII as the hyperoxidized Prx in these cells. Unexpectedly, RBCs from sulfiredoxin-deficient mice also exhibited circadian oscillation of Prx-SO2H. Analysis of the effects of protease inhibitors together with the observation that the purified 20S proteasome degraded PrxII-SO2H selectively over nonhyperoxidized PrxII suggested that the 20S proteasome is responsible for the decay phase of PrxII-SO2H oscillation. About 1% of total PrxII undergoes daily oscillation, resulting in a gradual loss of PrxII during the life span of RBCs. PrxII-SO2H was detected in cytosolic and ghost membrane fractions of RBCs, and the amount of membrane-bound PrxII-SO2H oscillated in a phase opposite to that of total PrxII-SO2H. Our results suggest that membrane association of PrxII-SO2H is a tightly controlled process and might play a role in the tuning of RBC function to environmental changes.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Cho CS,Yoon HJ,Kim JY,Woo HA,Rhee SG

doi

10.1073/pnas.1401100111

subject

Has Abstract

pub_date

2014-08-19 00:00:00

pages

12043-8

issue

33

eissn

0027-8424

issn

1091-6490

pii

1401100111

journal_volume

111

pub_type

杂志文章

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