Phosphorylation and concomitant structural changes in human 2-Cys peroxiredoxin isotype I differentially regulate its peroxidase and molecular chaperone functions.
FEBS Lett
; 580(1): 351-5, 2006 Jan 09.
Article
em En
| MEDLINE
| ID: mdl-16376335
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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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Peroxidases
/
Mutação Puntual
/
Chaperonas Moleculares
/
Substituição de Aminoácidos
Limite:
Humans
Idioma:
En
Ano de publicação:
2006
Tipo de documento:
Article