The selenoprotein methionine sulfoxide reductase B1 (MSRB1)

Lionel Tarrago, Alaattin Kaya, Hwa Young Kim, Bruno Manta, Byung Cheon Lee, Vadim N. Gladyshev

    Research output: Contribution to journalReview articlepeer-review

    26 Citations (Scopus)

    Abstract

    Methionine (Met) can be oxidized to methionine sulfoxide (MetO), which exist as R- and S-diastereomers. Present in all three domains of life, methionine sulfoxide reductases (MSR) are the enzymes that reduce MetO back to Met. Most characterized among them are MSRA and MSRB, which are strictly stereospecific for the S- and R-diastereomers of MetO, respectively. While the majority of MSRs use a catalytic Cys to reduce their substrates, some employ selenocysteine. This is the case of mammalian MSRB1, which was initially discovered as selenoprotein SELR or SELX and later was found to exhibit an MSRB activity. Genomic analyses demonstrated its occurrence in most animal lineages, and biochemical and structural analyses uncovered its catalytic mechanism. The use of transgenic mice and mammalian cell culture revealed its physiological importance in the protection against oxidative stress, maintenance of neuronal cells, cognition, cancer cell proliferation, and the immune response. Coincident with the discovery of Met oxidizing MICAL enzymes, recent findings of MSRB1 regulating the innate immunity response through reversible stereospecific Met-R-oxidation of cytoskeletal actin opened up new avenues for biological importance of MSRB1 and its role in disease. In this review, we discuss the current state of research on MSRB1, compare it with other animal Msrs, and offer a perspective on further understanding of biological functions of this selenoprotein.

    Original languageEnglish
    Pages (from-to)228-240
    Number of pages13
    JournalFree Radical Biology and Medicine
    Volume191
    DOIs
    Publication statusPublished - 2022 Oct

    Bibliographical note

    Publisher Copyright:
    © 2022

    Keywords

    • Methionine sulfoxide
    • Methionine sulfoxide reductase
    • Oxidative stress
    • Protein oxidation
    • Redox signaling
    • Selenium
    • Selenoprotein

    ASJC Scopus subject areas

    • Biochemistry
    • Physiology (medical)

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