MTERF3, the most conserved member of the mTERF-family, is a modular factor involved in mitochondrial protein synthesis

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Abstract

The MTERF-family is a wide family of proteins identified in Metazoa and plants which includes the known mitochondrial transcription termination factors. With the aim to shed light on the function of MTERF-family members in Drosophila, we performed the cloning and characterization of D-MTERF3, a component of the most conserved group of this family. D-MTERF3 is a mitochondrial protein of 323 amino acids. Sequence analysis in seven different organisms showed that the protein contains five conserved "mTERF-motifs", three of which include a leucine zipper-like domain. D-MTERF3 knock-down, obtained by RNAi in D.Mel-2 cells, did not affect mitochondrial replication and transcription. On the contrary, it decreased to a variable extent the rate of labelling of about half of the mitochondrial polypeptides, with ND1 being the most affected by D-MTERF3 depletion. These results indicate that D-MTERF3 is involved in mitochondrial translation. This role, likely based on protein-protein interactions, may be exerted either through a direct interaction with the translation machinery or by bridging the mitochondrial transcription and translation apparatus. © 2006 Elsevier B.V. All rights reserved.

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Roberti, M., Bruni, F., Loguercio Polosa, P., Manzari, C., Gadaleta, M. N., & Cantatore, P. (2006). MTERF3, the most conserved member of the mTERF-family, is a modular factor involved in mitochondrial protein synthesis. Biochimica et Biophysica Acta - Bioenergetics, 1757(9–10), 1199–1206. https://doi.org/10.1016/j.bbabio.2006.04.026

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