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 Biophysjournal_title
Cell biochemistry and biophysicsauthors
Tanaka A,Ueda Mdoi
10.1385/cbb:32:1-3:139subject
Has Abstractpub_date
2000-01-01 00:00:00pages
139-46eissn
1085-9195issn
1559-0283journal_volume
32 Springpub_type
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