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.
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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