Reference: Moro F, et al. (1999) The TIM17.23 preprotein translocase of mitochondria: composition and function in protein transport into the matrix. EMBO J 18(13):3667-75

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Abstract


We have analysed the structural organization of the TIM17.23 complex, the preprotein translocase of the mitochondrial inner membrane specific for protein targeting to the matrix. The components Tim17, Tim23 and Tim44 are present in this complex in equimolar amounts. A sub-complex containing Tim23 and Tim44 but no Tim17, or a sub-complex containing Tim23 and Tim17 but no Tim44 was not detected. Tim44 is peripherally associated at the matrix side. Tim44 forms dimers which recruit two molecules of mt-Hsp70 to the sites of protein import. A sequential, hand-over-hand mode of interaction of these two mt-Hsp70.Tim44 complexes with a translocating polypeptide chain is proposed.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Moro F, Sirrenberg C, Schneider HC, Neupert W, Brunner M
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