alexa Assembly and intracellular transport of snRNP particles.
Environmental Sciences

Environmental Sciences

Journal of Biodiversity, Bioprospecting and Development

Author(s): Andersen J, Zieve GW, Andersen J, Zieve GW

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Abstract The assembly of the major small nuclear ribonucleoprotein (snRNP) particles begins in the cytoplasm where large pools of common core proteins are preassembled in several RNA-free intermediate particles. Newly synthesized snRNAs transiently enter the cytoplasm and complex with core particles to form pre-snRNP particles. Subsequently, the cap structure at the 5' end of the snRNA is hypermethylated. The resulting trimethylguanosine (TMG) cap is an integral part of the nuclear localization signal for snRNP particles and the pre-snRNP particles are rapidly transported into the nucleus. SnRNP particles mature when snRNA-specific proteins complex with the particles, in some cases, just before or during nuclear transport, but in most instances after the particles are in the nucleus. In addition, U6 snRNA hybridizes with U4 snRNA to form a U4/U6 snRNP in the nucleus. The transport signals are retained on the snRNP particles and proteins since existing particles and proteins enter the reformed nucleus after mitosis. This article was published in Bioessays and referenced in Journal of Biodiversity, Bioprospecting and Development

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