5xti

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Cryo-EM architecture of human respiratory chain megacomplex-I2III2IV2

5xti, resolution 17.40Å

Structural highlights

5xti is a 22 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Electron Microscopy, Resolution 17.4Å
Ligands:
Experimental data:	Check to display Experimental Data
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Disease

NDUV1_HUMAN Isolated NADH-CoQ reductase deficiency;Leigh syndrome with leukodystrophy. The disease is caused by mutations affecting the gene represented in this entry. The disease is caused by mutations affecting the gene represented in this entry.

Function

NDUV1_HUMAN Core subunit of the mitochondrial membrane respiratory chain NADH dehydrogenase (Complex I) that is believed to belong to the minimal assembly required for catalysis. Complex I functions in the transfer of electrons from NADH to the respiratory chain. The immediate electron acceptor for the enzyme is believed to be ubiquinone (By similarity).

Publication Abstract from PubMed

The respiratory megacomplex represents the highest-order assembly of respiratory chain complexes, and it allows mitochondria to respond to energy-requiring conditions. To understand its architecture, we examined the human respiratory chain megacomplex-I2III2IV2 (MCI2III2IV2) with 140 subunits and a subset of associated cofactors using cryo-electron microscopy. The MCI2III2IV2 forms a circular structure with the dimeric CIII located in the center, where it is surrounded by two copies each of CI and CIV. Two cytochrome c (Cyt.c) molecules are positioned to accept electrons on the surface of the c1 state CIII dimer. Analyses indicate that CII could insert into the gaps between CI and CIV to form a closed ring, which we termed the electron transport chain supercomplex. The structure not only reveals the precise assignment of individual subunits of human CI and CIII, but also enables future in-depth analysis of the electron transport chain as a whole.

Architecture of Human Mitochondrial Respiratory Megacomplex I2III2IV2.,Guo R, Zong S, Wu M, Gu J, Yang M Cell. 2017 Sep 7;170(6):1247-1257.e12. doi: 10.1016/j.cell.2017.07.050. Epub 2017, Aug 24. PMID:28844695^[1]

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

References

↑ Guo R, Zong S, Wu M, Gu J, Yang M. Architecture of Human Mitochondrial Respiratory Megacomplex I2III2IV2. Cell. 2017 Sep 7;170(6):1247-1257.e12. doi: 10.1016/j.cell.2017.07.050. Epub 2017, Aug 24. PMID:28844695 doi:http://dx.doi.org/10.1016/j.cell.2017.07.050