The Sm-binding site of the kinetoplastid spliced leader RNA has been implicated in accurate spliced leader RNA maturation and trans-splicing competence. In Trypanosoma brucei, RNA interference-mediated knockdown of SmD1 caused defects in spliced leader RNA maturation, displaying aberrant 3'-end formation, partial formation of cap 4, and overaccumulation in the cytoplasm; U28 pseudouridylation was unaffected.
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Zeiner et al. (2004) studied this question.
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