Stimulatory effect of splicing factors on transcriptional elongation

Yick W. Fong and Qiang Zhou ()
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Yick W. Fong: University of California at Berkeley
Qiang Zhou: University of California at Berkeley

Nature, 2001, vol. 414, issue 6866, 929-933

Abstract: Abstract Transcription and pre-mRNA splicing are tightly coupled gene expression events in eukaryotic cells1,2. An interaction between the carboxy-terminal domain of the largest subunit of RNA polymerase (Pol) II and components of the splicing machinery is postulated to mediate this coupling3,4,5. Here, we show that splicing factors function directly to promote transcriptional elongation, demonstrating that transcription is more intimately coupled to splicing than previously thought. The spliceosomal U small nuclear ribonucleoproteins (snRNPs) interact with human transcription elongation factor TAT-SF1 (refs 6,7,8,9) and strongly stimulate polymerase elongation when directed to an intron-free human immunodeficiency virus-1 (HIV-1) template. This effect is likely to be mediated through the binding of TAT-SF1 to elongation factor P-TEFb10, a proposed component of the transcription elongation complex11,12. Inclusion of splicing signals in the nascent transcript further stimulates transcription, supporting the notion that the recruitment of U snRNPs near the elongating polymerase is important for transcription. Because the TAT-SF1–U snRNP complex also stimulates splicing in vitro, it may serve as a dual-function factor to couple transcription and splicing and to facilitate their reciprocal activation.

Date: 2001
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DOI: 10.1038/414929a

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