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- W2157316107 abstract "The view that the inner membrane possesses a structurally independent protein import system has been substantiated by the recent identification of three mitochondrial inner membrane proteins, which are essential components of the transport machinery. This chapter focuses on the properties of these translocase of the mitochondrial inner membrane (Tim)-proteins. The identification of the Tim-proteins now opens a broad area for characterization of the import apparatus. This will include the topology of the Tims, their mode of interaction with preproteins, and the specificity of the transport machinery. Of particular importance will be the analysis of the interaction of the Tims with each other and with mt-Hsp70 and partner proteins, as well as the identification of putative further components required for inner membrane transport. The process of mitochondrial protein uptake appears to be unidirectional and irreversible, that is, an imported protein is unable to move back into the cytosol. The conformational changes accompanying the import, folding, and assembly of proteins are by themselves usually not sufficient to drive an unidirectional transport. This is particularly obvious in the case ofprotein translocation across the mitochondrial inner membrane. The supply of two external energy sources, ATP and the membrane potential AY across the inner membrane, is needed to drive protein import. The chapter discusses that with some preproteins short segments may move back across the inner membrane when the function of the matrix Hsp70 is strongly impaired—for example, by ATP-depletion of the matrix, supporting the view of an energy-driven unidirectional transport." @default.
- W2157316107 created "2016-06-24" @default.
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- W2157316107 date "1996-01-01" @default.
- W2157316107 modified "2023-09-25" @default.
- W2157316107 title "Translocation of Preproteins Across the Mitochondrial Inner Membrane: Tims and HSP70" @default.
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- W2157316107 doi "https://doi.org/10.1016/s1569-2558(09)60012-6" @default.
- W2157316107 hasPublicationYear "1996" @default.
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