Baits for aptamer screens. (A) Diagrams of the TGMV AL1 coding regions (TAL11-352 and TAL11-130) cloned downstream of the LexA DBD are shown. Motifs I, II, and III, which are associated with rolling-circle replication initiator proteins, are marked by the black boxes, and their consensuses are shown (39, 43). The oval corresponds to a conserved helix-loop-helix motif, and the gray box is the ATP binding motif. (B) Baits were tested for oligomerization activity using the positive (AD:TAL11-352) and the negative (AD:Jun) prey controls. The yeast transformants are TAL11-352 plus AD:TAL11-352 (1), TAL11-352 plus AD:Jun (2), TAL11-130 plus AD:TAL11-352 (3), TAL11-130 plus AD:Jun (4), GUS plus AD:TAL11-352 (5), GUS plus AD:Jun (6), CaAL11-349 plus AD:TAL11-352 (7), and CaAL11-349 plus AD:Jun (8). Interaction was monitored by growth on Gal−HWUL medium. Growth on Glu−HWU medium controlled for plasmid selection, whereas no growth on Glu−HWUL verified that the interaction is dependent on the induction of prey plasmid expression.