
Locating motif VI on KREL1 carboxy-terminal domain. (A) Three-step ligation assay with KREL1 FL and CTD truncations. (B) Adenylylation assay with KREL1 FL and CTD truncations. (C) Adenylylation assay of KREL1 WT and group mutants (alanine substitutions for residues 441–444, KWKE) with and without the addition of KREPA2. (D) Adenylylation of point mutants and group mutants of KREL1, compared to adenylylation activity of KREL1 WT. Group mutants (GM) include KWKE substituted for AWAA and AAAA. (E) Adenylylation assay of KREL1 WT and group mutants with the addition of KREPA2 WT. Error bars on each graph represent SD obtained from three replicate experiments. (****) P < 0.0001, (***) P < 0.001, (**) P < 0.01, (*) P < 0.05.










