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Abstract:	NADH:ubiquinone oxidoreductase (complex I) of the electron transport chain is a multimeric mitochondrial enzyme of approximately 1000 kDa consisting of 46 different proteins encoded by both the mitochondrial and nuclear genomes. Little is known about the cellular mechanisms and protein chaperones that guide its assembly. In this issue of the JCI, Ogilvie et al. use genomic sequence data to compare the proteins produced by yeasts with and without complex I in order to generate a list of proteins whose human orthologs might serve as complex I assembly proteins. The gene encoding one of these candidate proteins, B17.2L, was found to harbor a nonsense mutation in one of 28 patients with a deficiency of complex I. B17.2L associated with subcomplexes that are seen when complex I assembly is incomplete. The research described here combines clever model organism genomics and bioinformatics with sophisticated human molecular and biochemical genetics to identify the first mammalian protein required for the normal assembly of complex I.
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MiPareas:	Gender Respiration Instruments;methods mt-Biogenesis;mt-density mt-Structure;fission;fusion mt-Membrane mtDNA;mt-genetics nDNA;cell genetics Genetic knockout;overexpression Comparative MiP;environmental MiP Developmental biology Exercise physiology;nutrition;life style mt-Medicine Patients Pharmacology;toxicology mt-Awareness
Pathological states:	COPD Aging;senescence Alzheimer's Autism Cancer Cardiovascular Diabetes Inherited Infectious Myopathy Neurodegenerative Obesity Parkinson's Sepsis Other
Stress conditions:	Hypoxia Cell death Cryopreservation Ischemia-reperfusion Permeability transition Oxidative stress;RONS Temperature Mitochondrial disease
Organism:	Pig Human Mouse Rat Guinea pig Bovines Horse Dog Rabbit Cat Other mammals Chicken Zebrafish Drosophila Artemia Caenorhabditis elegans Saccharomyces cerevisiae Birds Reptiles Amphibians Fishes Chelicerates Crustaceans Hexapods Myriapods Annelids Molluscs Nematodes Other invertebrates Fungi Plants Protists Eubacteria Archea Algae
Tissues;cells:	Fat Heart Skeletal muscle Nervous system Liver Kidney Lung;gill Islet cell;pancreas;thymus Endothelial;epithelial;mesothelial cell Blood cells Genital Other cell lines CHO HEK HeLa Neuroblastoma Fibroblast HUVEC Macrophage-derived Lymphocyte Platelet Stem cells
Preparations:	SMP Intact organism Intact organ Permeabilized cells Permeabilized tissue Homogenate Isolated mitochondria Chloroplasts Enzyme Oxidase;biochemical oxidation Intact cells
Enzyme:	Complex I Adenine nucleotide translocase Complex II;succinate dehydrogenase Complex III Complex IV;cytochrome c oxidase Complex V;ATP synthase Inner mt-membrane transporter Marker enzyme Supercomplex TCA cycle and matrix dehydrogenases Uncoupling protein
Regulation; kinetics:	pH Aerobic glycolysis ADP ATP ATP production AMP Calcium Coupling efficiency;uncoupling Cyt c Flux control Inhibitor Ion;substrate transport mt-Membrane potential Oxygen kinetics PCr;Cr Phosphate Redox state Substrate Temperature Threshold;excess capacity Uncoupler Fatty acid Amino acid Q-junction effect
Coupling:	ET LEAK ROUTINE OXPHOS
Pathways:	F N S Gp DQ CIV NS Other combinations ROX
High-resolution respirometry:	pH Oxygraph-2k TIP2k O2k-Fluorometer NO TPP Ca O2k-Spectrophotometer O2k-Manual O2k-Protocol Theory NextGen-O2k
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