A J-protein is an essential subunit of the presequence translocase–associated protein import motor of mitochondria

Transport of preproteins into the mitochondrial matrix is mediated by the presequence translocase–associated motor (PAM). Three essential subunits of the motor are known: mitochondrial Hsp70 (mtHsp70); the peripheral membrane protein Tim44; and the nucleotide exchange factor Mge1. We have identified...

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Detalles Bibliográficos
Autores principales: Truscott, Kaye N., Voos, Wolfgang, Frazier, Ann E., Lind, Maria, Li, Yanfeng, Geissler, Andreas, Dudek, Jan, Müller, Hanne, Sickmann, Albert, Meyer, Helmut E., Meisinger, Chris, Guiard, Bernard, Rehling, Peter, Pfanner, Nikolaus
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 2003
Materias:
Report
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2173675/
https://www.ncbi.nlm.nih.gov/pubmed/14638855
http://dx.doi.org/10.1083/jcb.200308004
Descripción
Sumario:Transport of preproteins into the mitochondrial matrix is mediated by the presequence translocase–associated motor (PAM). Three essential subunits of the motor are known: mitochondrial Hsp70 (mtHsp70); the peripheral membrane protein Tim44; and the nucleotide exchange factor Mge1. We have identified the fourth essential subunit of the PAM, an essential inner membrane protein of 18 kD with a J-domain that stimulates the ATPase activity of mtHsp70. The novel J-protein (encoded by PAM18/YLR008c/TIM14) is required for the interaction of mtHsp70 with Tim44 and protein translocation into the matrix. We conclude that the reaction cycle of the PAM of mitochondria involves an essential J-protein.

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