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Fig. 5. Kinase-dead PCTAIRE-1 disrupts protein localization within the early secretory pathway. Cells were transfected with plasmids to express GFP-PCTAIRE-1 (wild type or point mutants as indicated). (A) The K184R ('kinase-dead') point mutation in PCTAIRE-1 results in fragmentation of the Golgi (giantin) and redistribution of ERGIC-53 to a more dispersed localization. In contrast, the wild type or `active' mutants of PCTAIRE-3 do not cause these effects. (B) The K184R point mutation in PCTAIRE-1 results in redistribution of the ER-Golgi SNARE protein membrin to a more dispersed localization (asterisk), and a reduction in the intensity and juxtanuclear clustering of COPII-coated ERES marked with Sec24Dp. In contrast, the wild type or `active' mutants of PCTAIRE-3 do not cause these effects.