FIG. 6.

Amino acid sequence of the amino-terminal cytoplasmic tail of Us9 mutants. The dileucine motif at amino acids 30 and 31 is underlined twice, and the acidic domain from amino acids 46 to 55 is underlined once. Deletions are indicated by dashes, and amino acid substitutions are boxed. The relative locations of the tyrosine (Y) and casein kinase I and II sites (S) in the Us9 cytoplasmic tail are indicated in the diagram.