We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Phosphorylation and concomitant structural changes in human 2-Cys peroxiredoxin isotype I differentially regulate its peroxidase and molecular chaperone functions
- 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
- Abstract
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.
- Subjects
PEROXIDASE; MOLECULAR chaperones; PHOSPHORYLATION; CHEMICAL reactions
- Publication
FEBS Letters, 2006, Vol 580, Issue 1, p351
- ISSN
0014-5793
- Publication type
Article
- DOI
10.1016/j.febslet.2005.12.030