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. 1986 Oct;6(10):3502–3512. doi: 10.1128/mcb.6.10.3502

Amino-terminal fragments of delta 1-pyrroline-5-carboxylate dehydrogenase direct beta-galactosidase to the mitochondrial matrix in Saccharomyces cerevisiae.

M C Brandriss, K A Krzywicki
PMCID: PMC367099  PMID: 3025596

Abstract

delta 1-Pyrroline-5-carboxylate (P5C) dehydrogenase, the second enzyme in the proline utilization (Put) pathway of Saccharomyces cerevisiae and the product of the PUT2 gene, was localized to the matrix compartment by a mitochondrial fractionation procedure. This result was confirmed by demonstrating that the enzyme had limited activity toward an externally added substrate that could not penetrate the inner mitochondrial membrane (latency). To learn more about the nature of the import of this enzyme, three gene fusions were constructed that carried 5'-regulatory sequences through codons 14, 124, or 366 of the PUT2 gene ligated to the lacZ gene of Escherichia coli. When these fusions were introduced into S. cerevisiae either on multicopy plasmids or stably integrated into the genome, proline-inducible beta-galactosidase was made. The shortest gene fusion, PUT2-lacZ14, caused the production of a high level of beta-galactosidase that was found exclusively in the cytoplasm. The PUT2-lacZ124 and PUT2-lacZ366 fusions made lower levels of beta-galactosidases that were mitochondrially localized. Mitochondrial fractionation and protease-protection experiments showed that the PUT2-lacZ124 hybrid protein was located exclusively in the matrix, while the PUT2-lacZ366 hybrid was found in the matrix as well as the inner membrane. Thus, the amino-terminal 124 amino acids of P5C dehydrogenase carries sufficient information to target and deliver beta-galactosidase to the matrix compartment. The expression of the longer hybrids had deleterious effects on cell growth; PUT2-lacZ366-containing strains failed to grow on proline as the sole source of nitrogen. In the presence of the longest hybrid beta-galactosidase, the wild-type P5C dehydrogenase was still properly localized in the matrix compartment, but its activity was reduced. The nature of the effects of these hybrid proteins on cell growth is discussed.

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Selected References

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