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  • 1.
    Nitharwal, Ram Gopal
    et al.
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Schäfer, Jacob
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Wiseman, Benjamin
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Sjöstrand, Dan
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Kuang, Qie
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Ädelroth, Pia
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Brzezinski, Peter
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Högbom, Martin
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Biochemical and structural characterization of a superoxide dismutase-containing respiratory supercomplex from Mycobacterium smegmatisManuscript (preprint) (Other academic)
  • 2.
    Wiseman, Benjamin
    et al.
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Nitharwal, Ram Gopal
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Fedotovskaya, Olga
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Schäfer, Jacob
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Guo, Hui
    Kuang, Qie
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Benlekbir, Samir
    Sjöstrand, Dan
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Ädelroth, Pia
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Rubinstein, John L.
    Brzezinski, Peter
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Högbom, Martin
    Stockholm University, Faculty of Science, Department of Biochemistry and Biophysics.
    Structure of a functional obligate complex III2IV2 respiratory supercomplex from Mycobacterium smegmatis2018In: Nature Structural & Molecular Biology, ISSN 1545-9993, E-ISSN 1545-9985, Vol. 25, no 12, p. 1128-1136Article in journal (Refereed)
    Abstract [en]

    In the mycobacterial electron-transport chain, respiratory complex III passes electrons from menaquinol to complex IV, which in turn reduces oxygen, the terminal acceptor. Electron transfer is coupled to transmembrane proton translocation, thus establishing the electrochemical proton gradient that drives ATP synthesis. We isolated, biochemically characterized, and determined the structure of the obligate III2IV2 supercomplex from Mycobacterium smegmatis, a model for Mycobacterium tuberculosis. The supercomplex has quinol:O-2 oxidoreductase activity without exogenous cytochrome c and includes a superoxide dismutase subunit that may detoxify reactive oxygen species produced during respiration. We found menaquinone bound in both the Q(o) and Q(i) sites of complex III. The complex III-intrinsic diheme cytochrome cc subunit, which functionally replaces both cytochrome c(1) and soluble cytochrome c in canonical electron-transport chains, displays two conformations: one in which it provides a direct electronic link to complex IV and another in which it serves as an electrical switch interrupting the connection.

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