SR proteins escort the U4/U6.U5 tri-snRNP to the spliceosome.

@article{Roscigno1995SRPE,
  title={SR proteins escort the U4/U6.U5 tri-snRNP to the spliceosome.},
  author={R F Roscigno and Mariano A. Garcia-Blanco},
  journal={RNA},
  year={1995},
  volume={1 7},
  pages={692-706}
}
Pre-spliceosomes, formed in HeLa nuclear extracts and isolated by sedimentation on glycerol gradients, were chased into spliceosomes, the macromolecular enzyme that catalyzes intron removal. We demonstrate that the pre-spliceosome to spliceosome transition was dependent on ATP hydrolysis and required both a U-rich small nuclear ribonucleoprotein (U snRNP)-containing fraction and a fraction of non-snRNP factors. The active components in the non-snRNP fraction were identified as SR proteins and… CONTINUE READING

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