Tom34 unlike Tom20 does not interact with the leader sequences of mitochondrial precursor proteins

Archives of Biochemistry and Biophysics
A MukhopadhyayH Weiner

Abstract

Tom20 and Tom34 are mammalian liver proteins previously identified by others to be components of the mitochondrial import translocation apparatus. It has been shown that Tom20 interacts with the leader sequence of nuclear coded matrix space precursor proteins. Here we show with recombinantly expressed Tom proteins that Tom34 binds the mature portion of the precursor and not the leader. Both these Tom proteins inhibited the import of newly translated precursor of aldehyde dehydrogenase in an in vitro assay. Only Tom20 inhibited the import of a fusion protein of the leader of aldehyde dehydrogenase attached to dihydrofolate reductase. Antibodies against Tom20 coprecipitated both the precursor of aldehyde dehydrogenase (pALDH) and of dihydrofolate reductase (pA-DHFR). Antibodies against Tom34 interacted only when the mature portion of aldehyde dehydrogenase was present. Similar import inhibition patterns were found when other precursor and chimeric constructs we investigated. When Tom34-green fluorescence protein was transfected to HeLa cells it was observed that Tom34 was found through out the cell. It is concluded from our observation that Tom34 is a cytosolic protein, whose role appeared to be to interact with mature portion of...Continue Reading

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Citations

Mar 28, 2008·Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire·José R BlesaJosé Hernández-Yago
Jan 14, 2009·Biochemical and Biophysical Research Communications·J ColinI Guénal
Dec 20, 2011·Biochimica Et Biophysica Acta·Pierre Faou, Nicholas J Hoogenraad
Nov 2, 2018·Pathology Oncology Research : POR·Mohamed A H AhmedAbd AlRahman Mohammad Foda
Jan 26, 2021·Acta Neuropathologica·David C HondiusAugust B Smit

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