(A) Southern blot analysis of DNA
digestion with BglII and hybridization with the
SOU1 probe of the following strains: CAF4–2, the normal
SOU1/SOU1 strain; CA18, the singly
disrupted
SOU1/sou1-Δ∷hisG-URA3-hisG
strain; CA19, the singly disrupted
SOU1/sou1-Δ∷hisG
strain; CA20, the doubly disrupted
sou1-Δ∷hisG/sou1-Δ∷hisG-URA3-hisG
strain; and CA21, the doubly disrupted
sou1-Δ∷hisG/sou1-Δ∷hisG
strain. (B) Comparative growth of CAF4–2 and CA19 and CA21
on glucose medium (SD plus uridine) for 6 days at 37°C and
(C) on l-sorbose medium (plus uridine) for 14
days at 37°C. Each strain was spotted as serial 1/10 dilutions,
from left to right, starting from an initial concentration of
106 cells per ml.