title: Detection of oxidized methionine in selected proteins, cellular extracts and  blood serums by novel anti-methionine sulfoxide antibodies.
abstract: Methionine sulfoxide (MetO) is a common posttranslational modification to proteins occurring in vivo.These modifications are prevalent when reactive oxygen species levels are increased. To enable the detection of MetO in pure and extracted proteins from various sources, we have developed novel antibodies that can recognize MetO-proteins. These antibodies are polyclonal antibodies raised against an oxidized methionine-rich zein protein (MetO-DZS18) that are shown to recognize methionine oxidation in pure proteins and mouse and yeast extracts. Furthermore, mouse serum albumin and immunoglobulin (IgG)were shown to accumulate MetO as function of age especially in serums of methionine sulfoxide reductase A knockout mice. Interestingly, high levels of methionine-oxidized IgG in serums of subjects diagnosed with Alzheimer's disease were detected by western blot analysis using these antibodies. It is suggested that anti-MetO-DZS18 antibodies can be applied in the identification of proteins that undergo methionine oxidation under oxidative stress, aging, or disease state conditions.
authors.affiliation: Department of Pharmacology and Toxicology, School of Pharmacy, University of Kansas, Lawrence, KS 66045, USA.
authors.forename: Derek B
authors.initials: DB
authors.lastname: Oien
authors.forename: Tamar
authors.initials: T
authors.lastname: Canello
authors.forename: Ruth
authors.initials: R
authors.lastname: Gabizon
authors.forename: Maria
authors.initials: M
authors.lastname: Gasset
authors.forename: Brandi L
authors.initials: BL
authors.lastname: Lundquist
authors.forename: Jeff M
authors.initials: JM
authors.lastname: Burns
authors.forename: Jackob
authors.initials: J
authors.lastname: Moskovitz
mesh_terms: D000375:Aging; D000818:Animals; D000906:Antibodies / Q000276:immunology*; D000918:Antibody Specificity; D001798:Blood Proteins / Q000737:chemistry; D002457:Cell Extracts / Q000737:chemistry*; D006801:Humans; D008715:Methionine / Q000031:analogs & derivatives* / Q000032:analysis / Q000097:blood / Q000276:immunology / Q000378:metabolism; D010084:Oxidation-Reduction; D018384:Oxidative Stress; D011328:Prions / Q000737:chemistry; D011506:Proteins / Q000737:chemistry* / Q000276:immunology; D044967:Serum / Q000737:chemistry*
chemical_list: D000906:Antibodies; D001798:Blood Proteins; D002457:Cell Extracts; D011328:Prions; D011506:Proteins; D008715:Methionine; C013111:methionine sulfoxide