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Fig. 9. Analysis of glycosylation of tagged Syt I and II. (A) RBL cells transiently transfected with T7-Syt I, HA-Syt II or the chimeras HA-Syt I/Syt II and HA-Syt II(1-183aa)/Syt I cDNA were grown for 2 hours at 37°C and subsequently left untreated or incubated for 24 hours in the presence of tunicamycin (10 µg/ml). Cell lysates were resolved by SDS-PAGE and probed with either anti-T7 or anti-HA antibodies, as indicated. (B) Cell lysates derived from RBL cells transfected with T7-Syt I, HA-Syt II, HA-Syt I/Syt II and HA-Syt II(1-183aa)/Syt I cDNA were treated with N-glycosidase F or buffer as described in Materials and Methods. Lysates were subjected to SDS-PAGE and probed with anti-T7 or anti-HA antibodies. (C) Cell lysates (80 µg) derived from RBL cells stably transfected with Syt II-GFP or Flag-Syt II-GFP were treated with N-glycosidase F, resolved on SDS-PAGE and probed with anti-GFP antibodies. The asterisks in panels A-C indicate proteins that were reduced by tunicamycin or N-glycosidase F treatment. (D) RBL cells transfected with Syt II(T34/A)-GFP or Flag-Syt II(T34/A)-GFP were subjected to tunicamycin or (E) N-glycosidase F treatment as described above. (F) Lysates (80 µg) derived from RBL cells transiently transfected with Flag-Syt II-GFP (WT)(1, 5) or Flag-Syt II(T34/A)-GFP (
N)(2), or Syt II-GFP (WT)(3) or Syt II(T34/A)-GFP (
N)(4) or Flag-Syt II(T17/18/19/A)-GFP (
O) (6) were subjected to SDS-PAGE and probed with anti-GFP antibodies. Lane 3 is a longer ECL exposure time of the lane marked 3*.