title: Plasticity of TOM complex assembly in skeletal muscle mitochondria in response to chronic contractile activity.
abstract: We investigated the assembly of the TOM complex within skeletal muscle under conditions of chronic contractile activity-induced mitochondrial biogenesis. Tom40 import into mitochondria was increased by chronic contractile activity, as was its time-dependent assembly into the TOM complex. These changes coincided with contractile activity-induced augmentations in the expression of key protein import machinery components Tim17, Tim23, and Tom22, as well as the cytosolic chaperone Hsp90. These data indicate the adaptability of the TOM protein import complex and suggest a regulatory role for the assembly of this complex in exercise-induced mitochondrial biogenesis.
authors.affiliation: Department of Biology, York University, Toronto, Ontario, Canada M3J 1P3.
authors.forename: Anna-Maria
authors.initials: AM
authors.lastname: Joseph
authors.forename: David A
authors.initials: DA
authors.lastname: Hood
mesh_terms: D000818:Animals; D002352:Carrier Proteins / Q000378:metabolism*; D008297:Male; D008928:Mitochondria / Q000502:physiology*; D000090622:Mitochondrial Precursor Protein Import Complex Proteins; D009119:Muscle Contraction; D018482:Muscle, Skeletal / Q000502:physiology*; D055503:Protein Multimerization; D021381:Protein Transport; D051381:Rats; D017207:Rats, Sprague-Dawley
chemical_list: D002352:Carrier Proteins; D000090622:Mitochondrial Precursor Protein Import Complex Proteins