Sorting of peroxisomal and mitochondrial carnitine acetyltransferase isozymes in the diploid yeast, Candida tropicalis.

Abstract:

:Peroxisomal and mitochondrial carnitine acetyltransferase (CAT; EC 2.3.1.7) isozymes are synthesized from the first and second ATG codons of the open reading frame of one gene, Candida tropicalis CAT. Primer extension analysis and RNase protection assay revealed that the peroxisomal CAT, initiating at the second AUG codon of the transcripts, was synthesized by a translational readthrough of the first AUG codon of the open reading frame. When C. tropicalis CAT was introduced into the other yeast, Saccharomyces cerevisiae, 5' ends of transcripts were similar to those observed in C. tropicalis. Peroxisomal and mitochondrial CAT isozymes were strongly suggested to occur by the alternative initiation of translation, chiefly dependent on the structure or sequence context of the region from the 5' end to the second AUG codon; their transcripts harbored sufficient information to bring about alternative initiation of translation in both yeasts. Sorting of peroxisomal and mitochondrial CAT isozymes to their own compartment was carried out by their own targeting sequences, but, before transportation to their destination, their biosyntheses were regulated by alternative initiation of translation.

journal_name

Cell Biochem Biophys

authors

Tanaka A,Ueda M

doi

10.1385/cbb:32:1-3:139

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

139-46

eissn

1085-9195

issn

1559-0283

journal_volume

32 Spring

pub_type

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