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Reference: Haldi M and Guarente L (1989) N-terminal deletions of a mitochondrial signal sequence in yeast. Targeting information of delta-aminolevulinate synthase is encoded in non-overlapping regions. J Biol Chem 264(29):17107-12

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Abstract

A series of N-terminal deletions of the mitochondrial targeting sequence of the HEM1 product, delta-aminolevulinate synthase, was constructed. Targeting ability of mutant signals was assayed in vivo by fusion to beta-galactosidase or to the mature delta-aminolevulinate synthase. In the former case, the subcellular location of the fusion proteins provided a measure of import efficiency. In the later case, constructs were tested for complementation of delta hem 1 strains. We found this complementation assay to be particularly sensitive if the delta hem 1 strain is rho-. The results of these experiments, together with experiments deleting the signal from the carboxyl end, indicate that the targeting information is encoded in non-overlapping regions of the HEM1 signal.

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Haldi M, Guarente L
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