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Distinctive pattern and translational control of mitochondrial protein synthesis in rat brain synaptic endings

Loguercio Polosa, Paola and Attardi, Giuseppe (1991) Distinctive pattern and translational control of mitochondrial protein synthesis in rat brain synaptic endings. Journal of Biological Chemistry, 266 (15). pp. 10011-10017. ISSN 0021-9258.

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Mitochondrial gene expression has been investigated in synaptic endings from rat cerebral cortex isolated at various stages during the postnatal development and maturation of the animal. The pattern of the mitochondrial translation products labeled in vitro in rat brain synaptosomes revealed some distinctive features when compared with the pattern observed in a rat fibroblast cell line, the most remarkable being the apparent absence of labeling of the ND5 product. This absence contrasted with the presence in synaptosomes of an amount of ND5 mRNA comparable with that found in the rat fibroblast cell line. The rate of mitochondrial protein synthesis per unit amount of mtDNA inbrain synaptosomes showed a characteristic reproducible burst at 10-13 days after birth, thereafter declining sharply in the 3rd week to reach a level that remained constant over a 2-year period. The postnatal burst of mitochondrial protein synthesis coincided with a sharp increase in cytochrome c oxidase activity, pointing to a phase of rapid assembly of respiratory complexes. A comparison of the levels of mitochondrial mRNAs with the corresponding rates of protein synthesis during the animal development and maturation showed a lack of correlation. These observations, together with the apparent lack of translation of the ND5 mRNA, indicate that translational control plays a major role in the regulation of gene expression in rat brain synaptic mitochondria.

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Additional Information:Copyright © 1991 by the American Society for Biochemistry and Molecular Biology. (Received for publication, December 17, 1990) We thank Valeta Gregg for her help in the initial phase of the work and Anne Chomyn, Joel Lunardi, and Ram Sharma Puranam for helpful discussions. The technical assistance of Benneta Keeley, Arger Drew, and Lisa Tefo is gratefully acknowledged.
Issue or Number:15
Record Number:CaltechAUTHORS:POLjbc91
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7253
Deposited By: Lindsay Cleary
Deposited On:23 Jan 2007
Last Modified:02 Oct 2019 23:40

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