Figure 4.

Sequences from a PH domain of pleckstrin and from different versions of Boi1. Asterisks indicate those positions in a segment of pleckstrin's N-terminal PH domain that are implicated in binding to PIP₂[17]. Of these positions, those that have the same amino acid at the corresponding position in Boi1 are indicated with dark shading, and those that contain a similar amino acid are indicated with light shading. The sequences of the KK, TK, and KKTK mutant versions of Boi1 are represented by indicating only those amino acids in the mutants that are different from those in the corresponding positions of the wild-type protein.