101. An additional cysteine in a typical 2-Cys peroxiredoxin of Pseudomonas promotes functional switching between peroxidase and molecular chaperone.
- Author
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An BC, Lee SS, Jung HS, Kim JY, Lee Y, Lee KW, Lee SY, Tripathi BN, and Chung BY
- Subjects
- Amino Acid Sequence, Conserved Sequence, Disulfides chemistry, Hydrophobic and Hydrophilic Interactions, Molecular Sequence Data, Molecular Weight, Protein Multimerization, Protein Structure, Quaternary, Protein Structure, Secondary, Species Specificity, Cysteine, Molecular Chaperones metabolism, Peroxiredoxins chemistry, Peroxiredoxins metabolism, Pseudomonas aeruginosa enzymology, Pseudomonas putida enzymology
- Abstract
Peroxiredoxins (Prx) have received considerable attention during recent years. This study demonstrates that two typical Pseudomonas-derived 2-Cys Prx proteins, PpPrx and PaPrx can alternatively function as a peroxidase and chaperone. The amino acid sequences of these two Prx proteins exhibit 93% homology, but PpPrx possesses an additional cysteine residue, Cys112, instead of the alanine found in PaPrx. PpPrx predominates with a high molecular weight (HMW) complex and chaperone activity, whereas PaPrx has mainly low molecular weight (LMW) structures and peroxidase activity. Mass spectrometry and structural analyses showed the involvement of Cys112 in the formation of an inter-disulfide bond, the instability of LMW structures, the formation of HMW complexes, and increased hydrophobicity leading to functional switching of Prx proteins between peroxidase and chaperone., (Copyright © 2015 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.)
- Published
- 2015
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