A model of the function of ATG101 in the ULK1 complex. The interaction between ATG13HORMA and ATG14 is indicated with the magenta curved arrow and the ULK1 kinase phosphorylates several components of PtdIns3K complex indicated by the cyan curved arrow. The C-terminal region of ATG101 (green ribbon) that binds to PtdIns3K complexes (C1 and C2) and is indicated by the blue dotted oval. A WF finger of ATG101 (red dotted oval) cannot interact with the PtdIns3K complex but affects WIPI1 or ZFYVE1 function indicated by the purple arrow. KD, kinase domain; MIT, microtubule interacting and transport; MIM, MIT-interacting motif; RB1CC1, RB1 inducible coiled-coil 1; WIPI1, WD repeat domain, phosphoinositide interacting 1; ZFYVE1, zinc finger FYVE-type containing 1.