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. 1995 Aug 11;23(15):2966–2972.

Overexpression of DEAD box protein pMSS116 promotes ATP-dependent splicing of a yeast group II intron in vitro.

I Niemer 1, C Schmelzer 1, G V Börner 1
PMCID: PMC307137  PMID: 7659519

Abstract

The group II intron bI1, the first intron of the mitochondrial cytochrome b gene in yeast is self-splicing in vitro. Genetic evidence suggests that trans-acting factors are required for in vivo splicing of this intron. In accordance with these findings, we present in vitro data showing that splicing of bI1 under physiological conditions depends upon the presence of proteins of a mitochondrial lysate. ATP is an essential component is this reaction. Overexpression of the nuclear-encoded DEAD box protein pMSS-116 results in a marked increase in the ATP-dependent splicing activity of the extract, suggesting that pMSS116 may play an important role in splicing of bI1.

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