Pulldown analysis of the SNAREs and SEC11 with the KC167–91 cytosolic domain. Tagged proteins were expressed and purified from Escherichia coli using His-affinity and size-exclusion chromatography before incubation in vitro overnight at 4°C. Shown is one of three independent pulldown experiments with Coomassie-stained SDS-PAGE analysis following separation with Strep-Tactin resin-immobilized KC167–91-Flag6-StrepII. Lane sets are the SDS-PAGE results of (left to right) the pulldown, the resin control, and the loading. Incubations were carried out individually with SYP121ΔC-Flag-6His, VAMP721ΔC-Flag-6His, Flag3-SNAP33-6His, and SEC11-Flag6-6His. The unrelated iLOV-6His protein (Christie et al., 1998) was included as a control. Note the lower-molecular weight fractions that are common for purified SEC11 (Karnik et al., 2013b).