Table I. Yeast strains.

Strain	Genotype	Source
JM231	MATa leu2Δ1 ura3-52 [pRS416]
JM269	MATa leu2-3,112, ura3-52, his4-34 [pMR3392]
JY429	MATα fus1Δ1 fus2Δ3 ura3-52 trp1Δ1	G.R. Fink (Whitehead     Institute, Cambridge MA)
MY8093	MATα his3Δ1 leu2Δ0 ura3Δ0 lys2Δ0	Invitrogen
MY9182	MATa fus2Δ∷HIS3 his3Δ1 leu2Δ0 ura3Δ0 met15Δ0 [pRS416]
MY9183	MATa fus2Δ∷HIS3 his3Δ1 leu2Δ0 ura3Δ0 met15Δ0 [pMR5480]
MY9184	MATa fus2Δ∷HIS3 his3Δ1 leu2Δ0 ura3Δ0 met15Δ0 [pMR5482]
MY9201	MATa fus2Δ∷HIS3 his3Δ1 leu2Δ0 ura3Δ0 met15Δ0 [pMR5469]
MY9208	MATa bni1Δ∷kanMX fus2Δ∷HIS3 his3Δ1 leu2Δ0 ura3Δ0 met15Δ0 rho− [pMR5482]
MY9211	MATa fus3Δ∷kanMX fus2Δ∷HIS3 his3Δ1 leu2Δ0 ura3Δ0 met15Δ0 rho− [pMR5482]
MY9213	MATa pea2Δ∷kanMX fus2Δ∷HIS3 his3Δ1 leu2Δ0 ura3Δ0 met15Δ0 rho− [pMR5482]
MY9214	MATa rvs161Δ∷kanMX fus2Δ∷HIS3 his3Δ1 leu2Δ0 ura3Δ0 met15Δ0 rho− [pMR5482]
MY9216	MATa spa2Δ∷kanMX fus2Δ∷HIS3 his3Δ1 leu2Δ0 ura3Δ0 met15Δ0 rho− [pMR5482]
MY9217	MATa fus1Δ∷kanMX fus2Δ∷HIS3 his3Δ1 leu2Δ0 ura3Δ0 met15Δ0 rho− [pMR5482]
MY9231	MATa rvs161Δ∷LEU2 fus2Δ∷HIS3 his3Δ200 leu2Δ1 ura3-52 trp1Δ63 [pMR5482]
MY9233	MATa rvs161-P203Q fus2Δ∷HIS3 his3Δ200 leu2Δ1 ura3-52 trp1Δ63 [pMR5482]
MY9239	MATa rvs161-A175P fus2Δ∷HIS3 his3Δ200 leu2Δ1 ura3-52 trp1Δ63 [pMR5482]
BY1034	MATa fus2∷HIS3 RVS167-3xHA∷kanMX ura3-52 lys2-801 ade2-107     his3Δ200 trp1Δ63 leu2-Δ1	Friesen et al., 2006
MY10025	MATa fus2∷HIS3 RVS167-3xHA∷kanMX ura3-52 lys2-801 ade2-107     his3Δ200 trp1Δ63 leu2-Δ1 [pMR2414]	From BY1034
MY10026	MATa fus2∷HIS3 RVS167-3xHA∷kanMX ura3-52 lys2-801 ade2-107     his3Δ200 trp1Δ63 leu2-Δ1 [pMR5480]	From BY1034
BY263	MATa fus2∷HIS3 ura3-52 lys2-801 ade2-107 his3Δ200 trp1Δ63 leu2-Δ1	Friesen et al., 2006
MY10027	MATa fus2∷HIS3 ura3-52 lys2-801 ade2-107 his3Δ200 trp1Δ63 leu2-Δ1 [pMR2414]	From BY263
MY10028	MATa fus2∷HIS3 ura3-52 lys2-801 ade2-107 his3Δ200 trp1Δ63 leu2-Δ1 [pMR5480]	From BY263

All strains were constructed for this study unless otherwise noted.