Review Article

MNRR1, a Biorganellar Regulator of Mitochondria

Table 1

Comparison of various identified functions, effects, and properties of MNRR1 and CHCHD10.

MNRR1CHCHD10

Protein length151142
CHCH domain114–144102–132
Interactions identified using mass
spectrometry (BioGRID database)
97 total unique interactors (common
interactors for both: C1QBP, NDUFS3,
NDUFA8, COX5A, COX6A1, COX6C,
ATP5H, ECH1, USMG5)
42 total unique interactors (common
interactors for both: C1QBP, NDUFS3,
NDUFA8, COX5A, COX6A1, COX6C,
ATP5H, ECH1, USMG5)
Expression (Human Protein Atlas)Expressed in all tissues at medium to
high levels
Muscle, heart, liver (high), brain (medium),
and low levels for other tissues
Mitochondrial functionRegulation of COX activity, ROS
production [3], apoptosis [27]
Regulation of COX activity and ATP
production [67], cristae morphology
[68, 69]
Nuclear functionTranscriptional activator for COX4I2
and itself [3]
Not known to be localized to nucleus
Hypoxia sensitivityUpregulated at 4% oxygen [25]Unknown
Posttranslational regulationPhosphorylated at Y99 by Abl2 kinase
which activates mitochondrial function [20]
Unknown
Disease association
(altered protein/transcript levels)
Huntington’s disease [57], hepatocellular
carcinoma [66], nonsmall cell lung
carcinoma [28], lissencephaly [60]
Gastric cancer [91]
Mutation in protein associated
with disease
Parkinson’s disease [47]Mitochondrial myopathy, amyotrophic
lateral sclerosis, Alzheimer’s disease, frontotemporal
dementia, cerebellar ataxia, spinal muscular atrophy,
Charcot-Marie-Tooth disease type 2A, motor neuron
disease (specific references and mutations
summarized in Table 2)
Functionally characterized mutationsQ112H [20], 300+5G>A [47]S59L and P34S [68, 69], R15L/G58R [71]