The N-terminal domain of the Tup protein has been shown to interact with the Ssn6 transcriptional co-repressor [1].

1: Mutations of the WD repeats that compromise Tup1 repression function maintain structural integrity of the WD domain trypsin-resistant core. Zhang Z, Varanasi U, Carrico P, Trumbly RJ; Arch Biochem Biophys. 2002;406:47-54. PMID:12234489