Table 1.

Strains or plasmids used in this work

Name	Description
Strains
NOY396	MATα ade2–1 ura3–1 trp1–1 leu2–3, 112 his3–11,15 can1–100
NOY1051	MATα ade2–1 ura3–1 trp1–1 leu2–3, 112 his3–11,15 can1–100 fob1Δ::HIS3 rpa135Δ::LEU2; pNOY117 rDNA copy number ≈143 (34)
NOY1064	MATa ade2–1 ura3–1 trp1–1 leu2–3, 112 his3–11,15 can1–100 fob1Δ::HIS3; rDNA copy number ≈190 (42)
NOY1071	Same as NOY1064, but rDNA copy number ≈25 (42)
NOY886	Same as NOY1051, but rDNA copy number ≈42 (34)
DAS317	Same as NOY396, but PAF1–his7-(HA)3-::HIS3
DAS477	Same as NOY396, but MATa RPA135–his7-(HA)3::TRP1
DAS507	Same as NOY396, but CDC73–his7-(HA)3::HIS3
DAS509	Same as NOY396, but CTR9–his7-(HA)3::HIS3
DAS511	Same as NOY396, but cdc73Δ::HIS3
DAS513	Same as NOY396, but ctr9Δ::HIS3
DAS516	Same as NOY396, but paf1Δ::HIS3
Plasmids
PNOY117	pRS314 (pBluescript, CEN6, ARSH4, TRP1) derivative carrying RPA135
pRS316	pBluescript, CEN6, ARSH4, URA3; see ref. 43