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Molecular and Cellular Biology, April 2006, p. 3135-3148, Vol. 26, No. 8
0270-7306/06/$08.00+0 doi:10.1128/MCB.26.8.3135-3148.2006
The Spt4p Subunit of Yeast DSIF Stimulates Association of the Paf1 Complex with Elongating RNA Polymerase II
Hongfang Qiu,
Cuihua Hu,
Chi-Ming Wong, and
Alan G. Hinnebusch*
Laboratory of Gene Regulation and Development, National Institute of Child Health and Human Development, Bethesda, Maryland 20892
Received 8 December 2005/
Accepted 12 January 2006
The Paf1 complex (Paf1C) interacts with RNA polymerase II (Pol II) and promotes histone methylation of transcribed coding sequences, but the mechanism of Paf1C recruitment is unknown. We show that Paf1C is not recruited directly by the activator Gcn4p but is dependent on preinitiation complex assembly and Ser5 carboxy-terminal domain phosphorylation for optimal association with ARG1 coding sequences. Importantly, Spt4p is required for Paf1C occupancy at ARG1 (and other genes) and for Paf1C association with Ser5-phosphorylated Pol II in cell extracts, whereas Spt4p-Pol II association is independent of Paf1C. Since spt4
does not reduce levels of Pol II at ARG1, Ser5 phosphorylation, or Paf1C expression, it appears that Spt4p (or its partner in DSIF, Spt5p) provides a platform on Pol II for recruiting Paf1C following Ser5 phosphorylation and promoter clearance. spt4
reduces trimethylation of Lys4 on histone H3, demonstrating a new role for yeast DSIF in promoting a Paf1C-dependent function in elongation.
* Corresponding author. Mailing address: NIH, Building 6A, Room B1A-13, Bethesda, MD 20892. Phone: (301) 496-4480. Fax: (301) 496-6828. E-mail:
ahinnebusch{at}nih.gov.
Molecular and Cellular Biology, April 2006, p. 3135-3148, Vol. 26, No. 8
0270-7306/06/$08.00+0 doi:10.1128/MCB.26.8.3135-3148.2006
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