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. 2019 Apr 1;30(8):1008–1019. doi: 10.1091/mbc.E18-09-0579

FIGURE 8:

FIGURE 8:

Model of Arl1-Imh1 acting on the Ypt6-independent endosome-to-TGN retrograde transport. (A) Under normal conditions, endosome-to-TGN retrograde transport is mainly mediated by the Ypt6-dependent GARP complex. (B) Dysfunction of YPT6 leads to a defective Golgi membrane environment, which impairs TGN localization of the GARP complex and endosome-to-TGN transport. (C) Overexpression of the N-terminal mutant Imh1 can stabilize active Arl1 at the TGN but cannot recruit the GARP complex to the TGN to promote proper targeting of endosome-derived vesicles. (D) We hypothesize that Imh1 might direct its function through indirect mechanisms, as the association of Imh1dN100 with Vps53 is insufficient to restore GARP localization. Imh1 might recruit a protein X and either associate with the GARP complex through protein X or together with it contribute to restoring the defective membrane environment resulting from YPT6 deletion.