Abstract
The beta subunit of the heterotrimeric G proteins that transduce signals across the plasma membrane is made up of an amino-terminal alpha-helical segment followed by seven repeating units called WD (Trp-Asp) repeats that occur in about 140 different proteins. The seven WD repeats in Gbeta, the only WD repeat protein whose crystal structure is known, form seven antiparallel beta sheets making up the blades of a toroidal propeller structure (Wall, M. A., Coleman, D. E., Lee, E., Iniguez-Lluhi, J. A., Posner, B. A., Gilman, A. G., and Sprang, S. R. (1995) Cell 83, 1047-1058; Sondek, J., Bohm, A., Lambright, D. G., Hamm, H. E., and Sigler, P. B. (1996) Nature 379, 369-374). It is likely that all proteins with WD repeats form a propeller structure. Alignment of the sequence of 918 unique WD repeats reveals that 85% of the repeats have an aspartic acid (D) residue (not the D of WD) in the turn connecting beta strands b and c of each putative propeller blade. We mutated each of these conserved Asp residues to Gly individually and in pairs in Gbeta and in Sec13, a yeast WD repeat protein involved in vesicular traffic, and then analyzed the ability of the mutant proteins to fold in vitro and in COS-7 cells. In vitro, most single mutant ...Continue Reading
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