Mutations in the accessory subunit NDUFB10 result in isolated complex I deficiency and illustrate the critical role of intermembrane space import for complex I holoenzyme assembly.

Abstract:

:An infant presented with fatal infantile lactic acidosis and cardiomyopathy, and was found to have profoundly decreased activity of respiratory chain complex I in muscle, heart and liver. Exome sequencing revealed compound heterozygous mutations in NDUFB10, which encodes an accessory subunit located within the PD part of complex I. One mutation resulted in a premature stop codon and absent protein, while the second mutation replaced the highly conserved cysteine 107 with a serine residue. Protein expression of NDUFB10 was decreased in muscle and heart, and less so in the liver and fibroblasts, resulting in the perturbed assembly of the holoenzyme at the 830 kDa stage. NDUFB10 was identified together with three other complex I subunits as a substrate of the intermembrane space oxidoreductase CHCHD4 (also known as Mia40). We found that during its mitochondrial import and maturation NDUFB10 transiently interacts with CHCHD4 and acquires disulfide bonds. The mutation of cysteine residue 107 in NDUFB10 impaired oxidation and efficient mitochondrial accumulation of the protein and resulted in degradation of non-imported precursors. Our findings indicate that mutations in NDUFB10 are a novel cause of complex I deficiency associated with a late stage assembly defect and emphasize the role of intermembrane space proteins for the efficient assembly of complex I.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Friederich MW,Erdogan AJ,Coughlin CR 2nd,Elos MT,Jiang H,O'Rourke CP,Lovell MA,Wartchow E,Gowan K,Chatfield KC,Chick WS,Spector EB,Van Hove JLK,Riemer J

doi

10.1093/hmg/ddw431

subject

Has Abstract

pub_date

2017-02-15 00:00:00

pages

702-716

issue

4

eissn

0964-6906

issn

1460-2083

pii

ddw431

journal_volume

26

pub_type

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