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Purified cyt b6f complex increases autophosphorylation of the Stt7 kinase domain depending on the presence of Arg125suIV. Immunoblots of Stt7-KD autophosphorylation reactions in the presence of WT or Arg125Glu cyt b6f complex. An antibody against phospho-threonine (Cell Signaling) was used to detect Stt7-KD autophosphorylation. Antibodies against Strep-tag (recognizing the C-terminal tag of Stt7-KD) and subunit IV were used as loading and transfer controls.
