NDLI: Analysis of Methionine/Selenomethionine Oxidation and Methionine Sulfoxide Reductase Function Using Methionine-Rich Proteins and Antibodies against Their Oxidized Forms†

Content Provider	PubMed Central
Author	Le, Dung Tien Liang, Xinwen Fomenko, Dmitri E. Raza, Ashraf S. Chong, Chom-kyu Carlson, Bradley A. Hatfield, Dolph L. Gladyshev, Vadim N.
Abstract	Methionine (Met) residues are present in most proteins. However, this sulfur-containing amino acid is highly susceptible to oxidation. In cells, the resulting Met sulfoxides are reduced back to Met by stereospecific reductases MsrA and MsrB. Reversible Met oxidation occurs even in the absence of stress, is elevated during aging and disease, but is notoriously difficult to monitor. In this work, we computationally identified natural Met-rich proteins (MRPs) and characterized three such proteins containing 21–33% Met residues. Oxidation of multiple Met residues in MRPs with H2O2 and reduction of Met sulfoxides with MsrA/MsrB dramatically influenced the mobility of these proteins on polyacrylamide gels and could be monitored by simple SDS–PAGE. We further prepared antibodies enriched for reduced and Met sulfoxide forms of these proteins and used them to monitor Met oxidation and reduction by immunoblot assays. We describe applications of these reagents for the analysis of MsrA and MsrB functions, as well as the development of the assay for high-throughput analysis of their activities. We also show that all Met sulfoxide residues in an MRP can be reduced by MsrA and MsrB. Furthermore, we prepared a selenomethionine form of an MRP and found that selenomethionine selenoxide residues can be efficiently reduced nonenzymatically by glutathione and other thiol compounds. Selenomethionine selenoxide residues were not recognized by antibodies specific for the Met sulfoxide form of an MRP. These findings, reagents, assays, and approaches should facilitate research and applications in the area of Met sulfoxide reduction, oxidative stress, and aging.
Related Links	http://dx.doi.org/10.1021/bi800422s
Ending Page	6694
Page Count	10
Starting Page	6685
File Format	PDF
ISSN	00062960
e-ISSN	15204995
Journal	Biochemistry
Issue Number	25
Volume Number	47
Language	English
Publisher Date	2008-06-01
Access Restriction	Open
Subject Keyword	Biochemistry Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Biochemistry

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