The single translation product of the FUM1 gene (fumarase) is processed in mitochondria before being distributed between the cytosol and mitochondria in Saccharomyces cerevisiae

Ilan Stein, Yoav Peleg, Sharona Even-Ram, Ophry Pines*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

94 Scopus citations

Abstract

The yeast mitochondrial and cytosolic isoenzymes of fumarase, which are encoded by a single nuclear gene (FUM1), follow a unique mechanism of protein subcellular localization and distribution. Translation of all FUM1 messages initiates only from the 5'-proximal AUG codon and results in a single translation product that contains the targeting sequence located within the first 32 amino acids of the precursor. All fumarase molecules synthesized in the cell are processed by the mitochondrial matrix signal peptidase; nevertheless, most of the enzyme (80 to 90%) ends up in the cytosol. The translocation and processing of fumarase are cotranslational. We suggest that in Saccharomyces cerevisiae, the single type of initial translation product of the FUM1 gene is first partially translocated, and then a subset of these molecules continues to be fully translocated into the organelle, whereas the rest are folded into an import-incompetent state and are released by the retrograde movement of fumarase into the cytosol.

Original languageAmerican English
Pages (from-to)4770-4778
Number of pages9
JournalMolecular and Cellular Biology
Volume14
Issue number7
DOIs
StatePublished - Jul 1994

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