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. 2001 Aug 3;276(31):29007-11.
doi: 10.1074/jbc.M100810200. Epub 2001 Jun 1.

The yeast a-factor transporter Ste6p, a member of the ABC superfamily, couples ATP hydrolysis to pheromone export

C J Ketchum  1 , W K Schmidt, G V Rajendrakumar, S Michaelis, P C Maloney
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Free article

The yeast a-factor transporter Ste6p, a member of the ABC superfamily, couples ATP hydrolysis to pheromone export

C J Ketchum et al. J Biol Chem. .
Free article

Abstract

ATP-binding cassette (ABC) proteins transport a diverse collection of substrates. It is presumed that these proteins couple ATP hydrolysis to substrate transport, yet ATPase activity has been demonstrated for only a few. To provide direct evidence for such activity in Ste6p, the yeast ABC protein required for the export of a-factor mating pheromone, we established conditions for purification of Ste6p in biochemical quantities from both yeast and Sf9 insect cells. The basal ATPase activity of purified and reconstituted Ste6p (V(max) = 18 nmol/mg/min; K(m) for MgATP = 0.2 mm) compares favorably with several other ABC proteins and was inhibited by orthovanadate in a profile diagnostic of ABC transporters (apparent K(I) = 12 microm). Modest stimulation (approximately 40%) was observed upon the addition of a-factor either synthetic or in native form. We also used an 8-azido-[alpha-(32)P]ATP binding and vanadate-trapping assay to examine the behavior of wild-type Ste6p and two different double mutants (G392V/G1087V and G509D/G1193D) shown previously to be mating-deficient in vivo. Both mutants displayed a diminished ability to hydrolyze ATP, with the latter uncoupled from pheromone transport. We conclude that Ste6p catalyzes ATP hydrolysis coupled to a-factor transport, which in turn promotes mating.

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