Phosphorylation and concomitant structural changes in human 2-Cys peroxiredoxin isotype I differentially regulate its peroxidase and molecular chaperone functions |
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Authors: | Jang Ho Hee Kim Sun Young Park Soo Kwon Jeon Hye Sook Lee Young Mee Jung Ji Hyun Lee Sun Yong Chae Ho Byoung Jung Young Jun Lee Kyun Oh Lim Chae Oh Chung Woo Sik Bahk Jeong Dong Yun Dae-Jin Cho Moo Je Lee Sang Yeol |
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Affiliation: | Environmental Biotechnology National Core Research Center, Gyeongsang National University, Jinju 660-701, Republic of Korea. |
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Abstract: | The H2O2-catabolizing peroxidase activity of human peroxiredoxin I (hPrxI) was previously shown to be regulated by phosphorylation of Thr90. Here, we show that hPrxI forms multiple oligomers with distinct secondary structures. HPrxI is a dual function protein, since it can behave either as a peroxidase or as a molecular chaperone. The effects of phosphorylation of hPrxI on its protein structure and dual functions were determined using site-directed mutagenesis, in which the phosphorylation site was substituted with aspartate to mimic the phosphorylated status of the protein (T90D-hPrxI). Phosphorylation of the protein induces significant changes in its protein structure from low molecular weight (MW) protein species to high MW protein complexes as well as its dual functions. In contrast to the wild type (WT)- and T90A-hPrxI, the T90D-hPrxI exhibited a markedly reduced peroxidase activity, but showed about sixfold higher chaperone activity than WT-hPrxI. |
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Keywords: | 2-Cys Prx, 2-cysteine peroxiredoxin ROS, reactive oxygen species HMW, high molecular weight LMW, low molecular weight |
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