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The yeast mitochondrial intron aI5 alpha: associated endonuclease activity and in vivo mobility.

Gene. 1992 Apr 01;113(1):1-8
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摘要


By analyzing crosses between yeast strains carrying different combinations of mitochondrial (mt) introns, we have shown that the aI5 alpha intron is mobile in vivo. Furthermore, we have observed that the mobility of intron aI5 alpha is affected by both the nuclear and mt genotypes. We have also detected a restriction endonuclease (ENase) activity that cleaves intronless mt genomes close to the aI5 alpha intron insertion site and thus might be involved in intron mobility. This is further supported by the fact that this ENase activity is only detected in a strain containing the aI5 alpha intron. Furthermore, similar to other ENases encoded by mobile mt introns of yeast, the ENase generates a cut with a four-base 3'-OH overhang. Thus, intron aI5 alpha represents a characteristic member of the family of mobile group-I introns.

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