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Dear Editor,Most mitochondrial proteins are encoded by the nuclear genome and posttranslationally imported to mitochondria.The correct targeting is often ensure
【机 构】
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Department of Biotechnology, University of Wroclaw, ul.Przybyszewskiego 63/77, 51-148 Wroclaw, Polan
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Dear Editor,Most mitochondrial proteins are encoded by the nuclear genome and posttranslationally imported to mitochondria.The correct targeting is often ensured by an N-terminal extension designated presequence.Upon import,the presequence is cleaved off in a reaction termed processing.Most of our knowledge regarding mitochondrial processing comes from analyses performed in Saccharomyces cerevisiae.In yeast,the mitochondrial processing peptidase (MPP) is responsible for processing of the majority of mitochondrial precursors,with a fraction of them undergoing a second step of processing,carried out by either metalloproteases (Oct1/MIP,Icp55) or serine proteases (Imp,Pcp1) (reviewed in Teixeira and Glaser,2012).Unusual two-step processing in which both processing steps are carried out by MPP has been reported for yeast and human frataxin (Branda et al.,1999) and for Neurospora crassa mitochondrial ATP synthase subunit 9 (Schmidt et al.,1984).
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