Summary of Giant interactions. (A) Diagram of a
cellularizing embryo showing the normal giant expression
pattern (Gt) in anterior and posterior regions. The posterior pattern
represses the eve stripe 5 enhancer (St5) to establish
the posterior stripe border. It is possible that Giant interacts with
an unknown bZIP subunit, X, that is distributed throughout the region
where stripe 5 is expressed. (B) Giant might recruit an
unknown corepressor, “?”, via the VLDLS motif. It is possible
that Giant also weekly interacts with dCtBP. The putative X subunit
might strongly interact with dCtBP, so that mutations in the Giant
repression domain do not impair the activity of Giant-X heterodimeric
complexes.