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. 1987 May;6(5):1361–1366. doi: 10.1002/j.1460-2075.1987.tb02376.x

cDNA-derived amino acid sequence of rat mitochondrial 3-oxoacyl-CoA thiolase with no transient presequence: structural relationship with peroxisomal isozyme.

H Arakawa, M Takiguchi, Y Amaya, S Nagata, H Hayashi, M Mori
PMCID: PMC553941  PMID: 3038520

Abstract

The sorting of homologous proteins between two separate intracellular organelles is a major unsolved problem. 3-Oxoacyl-CoA thiolase is localized in mitochondria and peroxisomes, and provides a good system for the study on the problem. Unlike most mitochondrial matrix proteins, mitochondrial 3-oxoacyl-CoA thiolase in rats is synthesized with no transient presequence and possess information for mitochondrial targeting and import in the mature protein. Two overlapping cDNA clones contained an open reading frame encoding a polypeptide of 397 amino acid residues (predicted Mr = 41,868), a 5' untranslated sequence of 164 bp, a 3' untranslated sequence of 264 bp and a poly(A) tract. The amino acid sequence of the mitochondrial thiolase is 37% identical with that of the mature portion of rat peroxisomal 3-oxoacyl-CoA thiolase precursor. These results suggest that the two thiolases have a common origin and obtained information for targeting to respective organelles during evolution. Two portions in the mitochondrial thiolase that may serve as a mitochondrial targeting signal are presented.

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Selected References

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