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Atomic structures of respiratory complex III2, complex IV, and supercomplex III2-IV from vascular plants

Open access
Maldonado, Maria, Guo, Fei, Letts, James A·2021·eLife

Abstract

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.

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Metadata

Authors
Maldonado, M., Guo, F., & Letts, J. A.
Venue
eLife
Published
2021-01-19
Volume
10
ISSN
2050-084X (ISSN-L)
OpenAlex
W3125247928
Cited by
834
References
3
FWCI
41.06
Type
journal article
Language
en
Open access
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CoChat. (2026). Citation check: Atomic structures of respiratory complex III2, complex IV, and supercomplex III2-IV from vascular plants. https://app.cochat.ai/papers/10.7554/elife.62047
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Maldonado, M., Guo, F., & Letts, J. A. (2021). Atomic structures of respiratory complex III2, complex IV, and supercomplex III2-IV from vascular plants. eLife. https://doi.org/10.7554/elife.62047

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