Funding Organization(s): Knut and Alice Wallenberg Foundation, Swedish Research Council, Canadian Institutes of Health Research (CIHR), Canada Research Chairs
Corynebacterium glutamicum is a preferentially aerobic gram-positive bacterium belonging to the phylum Actinobacteria, which also includes the pathogen Mycobacterium tuberculosis. In these bacteria, respiratory complexes III and IV form a CIII 2 CIV 2 supercomplex that catalyzes oxidation of menaquinol and reduction of dioxygen to water. We isolated the C. glutamicum supercomplex and used cryo-EM to determine its structure at 2.9 Å resolution. The structure shows a central CIII 2 dimer flanked by a CIV on two sides. A menaquinone is bound in each of the Q N and Q P sites in each CIII and an additional menaquinone is positioned ∼14 Å from heme b L . A di-heme cyt. cc subunit electronically connects each CIII with an adjacent CIV, with the Rieske iron-sulfur protein positioned with the iron near heme b L . Multiple subunits interact to form a convoluted sub-structure at the cytoplasmic side of the supercomplex, which defines a path for proton transfer into CIV.
Organizational Affiliation:
Department of Biochemistry and Biophysics, The Arrhenius Laboratories for Natural Sciences, Stockholm University, 106 91 Stockholm, Sweden.
Molecular Medicine Program, The Hospital for Sick Children, 686 Bay Street, Toronto, ON M5G 0A4, Canada; Department of Medical Biophysics, The University of Toronto, 101 College Street, Toronto, ON M5G 1L7, Canada.
Institute of Bio- and Geosciences, IBG-1: Biotechnology, Forschungszentrum Jülich, 52425 Jülich, Germany.
Molecular Medicine Program, The Hospital for Sick Children, 686 Bay Street, Toronto, ON M5G 0A4, Canada; Department of Medical Biophysics, The University of Toronto, 101 College Street, Toronto, ON M5G 1L7, Canada; Department of Biochemistry, The University of Toronto, 1 Kings College Circle, Toronto, ON M5S 1A8, Canada. Electronic address: john.rubinstein@utoronto.ca.
Department of Biochemistry and Biophysics, The Arrhenius Laboratories for Natural Sciences, Stockholm University, 106 91 Stockholm, Sweden. Electronic address: martin.hogbom@dbb.su.se.
Department of Biochemistry and Biophysics, The Arrhenius Laboratories for Natural Sciences, Stockholm University, 106 91 Stockholm, Sweden. Electronic address: peter.brzezinski@dbb.su.se.
AC [auth f] CA [auth E] CB [auth A] CC [auth f] DB [auth A]
AC [auth f], CA [auth E], CB [auth A], CC [auth f], DB [auth A], DC [auth f], EC [auth f], FB [auth A], FC [auth f], GA [auth F], HD [auth b], IA [auth F], JA [auth F], KA [auth F], LA [auth F], NB [auth B], VB [auth e], ZC [auth a]
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