SmD1 Is Required for Spliced Leader RNA Biogenesis

Abstract
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; U 28 pseudouridylation was unaffected.