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Publication Abstract from PubMed

Mitochondrial complex III (CIII(2)) and complex IV (CIV), which can associate into a higher-order supercomplex (SC III(2)+IV), play key roles in respiration. However, structures of these plant complexes remain unknown. We present atomic models of CIII(2), CIV, and SC III(2)+IV from Vigna radiata determined by single-particle cryoEM. The structures reveal plant-specific differences in the MPP domain of CIII(2) and define the subunit composition of CIV. Conformational heterogeneity analysis of CIII(2) revealed long-range, coordinated movements across the complex, as well as the motion of CIII(2)'s iron-sulfur head domain. The CIV structure suggests that, in plants, proton translocation does not occur via the H channel. The supercomplex interface differs significantly from that in yeast and bacteria in its interacting subunits, angle of approach and limited interactions in the mitochondrial matrix. These structures challenge long-standing assumptions about the plant complexes and generate new mechanistic hypotheses.

Atomic structures of respiratory complex III(2), complex IV, and supercomplex III(2)-IV from vascular plants.,Maldonado M, Guo F, Letts JA Elife. 2021 Jan 19;10:e62047. doi: 10.7554/eLife.62047. PMID:33463523^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.