期刊
NUCLEUS
卷 1, 期 2, 页码 139-143出版社
TAYLOR & FRANCIS INC
DOI: 10.4161/nucl.1.2.10919
关键词
cap binding protein; capped mRNA; capped U snRNA; importin-alpha; importin-beta; CBC regulation
类别
资金
- NIGMS NIH HHS [R01 GM040654] Funding Source: Medline
The nuclear cap-binding complex (CBC), a heterodimer comprised of a 20 kDa subunit (CBP20) and an 80 kDa regulatory subunit (CBP80), binds to nascent RNA polymerase II transcripts and is important throughout different aspects of RNA metabolism. In a recent publication, using a combination of X-ray crystallographic information, mutagenesis studies, small-angle scattering experiments, analytical ultracentrifugation and in vivo assays, we presented evidence that importin-a and importin-beta, two nucleocytoplasmic transport proteins, play key roles in regulating the binding of capped RNA by the CBC in cells. A model for how complexes between CBC and the importins cycle in and out of the nucleus and direct the proper positional binding and release of capped RNA is presented here and is discussed in light of recent publications.
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