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Arava 2015 Abstract MiP2015
Additional label MiP2015  +
Event B1  + , Oral  +
Has abstract Most mitochondrial proteins are encoded in
Most mitochondrial proteins are encoded in the nucleus, and need to be imported into this organelle. The predominating, textbooks model for targeting to mitochondria asserts that proteins are translated throughout the cytoplasm and transported after their complete synthesis (i.e. post-translationally). However, recent mRNA localization studies revealed that many mRNAs that encode mitochondrial proteins are localized to the vicinity of mitochondria in a manner that involves translation. These results revived neglected model in which translation of mitochondrial mRNAs is localized to the mitochondria vicinity and import occurs cotranslationally. We are exploring the proteins that coordinate such localized translation. We previously established the involvement of the mitochondrial protein receptor Tom20 and the Hsp70-member Ssa1 in association of translating ribosomes with the mitochondria [1,2]. Herein we further elaborate on a role in localized translation for an additional factor, the conserved ribosome-associated Nascent-chain Associated Complex (NAC). NAC was shown to contribute to ribosomes’ association with mitochondria, yet its mitochondrial receptor was unknown. We performed several genome-wide protein complementation assays and detected an outer membrane protein (OM14) of an unknown function as associated with NAC[3]. Mitochondria deleted of OM14 had significantly lower amounts of associated NAC, and ribosomes deleted of NAC had reduced levels of associated OM14. Importantly, mitochondrial import assays revealed a significant decrease in import efficiency into OM14 deleted mitochondria and OM14-dependent import necessitated NAC. Our results identify OM14 as a mitochondrial receptor for ribosomes-associated NAC and reveal its importance for import. These studies re-establish localized translation as an additional mode for protein targeting to mitochondria.
ode for protein targeting to mitochondria.  +
Has title Localized translation near mitochondria: novel factors revive old model.  +
MiP area mt-Membrane  + , mtDNA;mt-genetics  + , nDNA;cell genetics  +
Was submitted in year 2015  +
Was submitted to event MiP2015 +
Was written by Arava Y + , Lesnik C + , Atir-Lande A + , Cohen Y + , Schuldiner M +
Categories Abstracts
Modification date
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14:18:35, 4 September 2015  +
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