Purification of syringolide binding protein. (A) Gel filtration purified 28-, 31-, and 34-kDa proteins were electrophoresed on a 12% SDS acrylamide gel. Lane 1, fraction 15 from the affinity column run in Fig. 1; lane 2, 28-kDa protein; lane 3, 31-kDa protein; lane 4, 34-kDa protein. (B) Syringolide binding activity of purified 28-, 31-, and 34-kDa proteins. Lanes are as in A.