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Arch Biochem Biophys. 2002 Oct 1;406(1):47-54.

Mutations of the WD repeats that compromise Tup1 repression function maintain structural integrity of the WD domain trypsin-resistant core.

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Department of Biochemistry and Molecular Biology, 3035 Arlington Avenue, Medical College of Ohio, Toledo, OH 43614, USA.


The yeast global transcriptional repressor Tup1 contains 7 WD repeats in its C-terminus that form a beta-propeller-like structure, in which the first and last WD repeats interact to make a closed circle. The WD domains of all proteins tested, including Tup1, form a compact structure resistant to trypsin digestion (Garcia-Higuera et al., Biochemistry 35 (1996) 13985-13994). We found that the in vitro formation of the trypsin-resistant core of Tup1 requires just five WD repeats (WD2-6). Deletion of the ST region between WD1 and WD2 destabilizes the trypsin-resistant core, but maintains Tup1 repression function in vivo. Linker insertion and point mutations in the WD repeats that compromise Tup1 repression function in vivo still maintain the trypsin-resistant core in vitro These results indicate that structural perturbation of the WD domain structure cannot explain the effects of these mutations on Tup1 repression function.

[Indexed for MEDLINE]

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