Required for cytoplasm to vacuole transport (Cvt) and autophagy as a part of the autophagy-specific VPS34 PI3-kinase complex I (By similarity). This complex is essential to recruit the ATG8-phosphatidylinositol conjugate and the ATG12-ATG5 conjugate to the pre-autophagosomal structure (By similarity). ATG14 mediates the specific binding of the VPS34 PI3-kinase complex I to the preautophagosomal structure (PAS) (By similarity). Component of the autophagy-specific VPS34 PI3-kinase complex I (By similarity). Coiled-Coils at the N-terminal half are essential for autophagy (By similarity). Still forms preautophagosomal structures (PAS) in proximity to the vacuolar membrane (PubMed:26442587). Kluyveromyces marxianus proteins are shorter in length and have a more ordered secondary structure than their S.cerevisiae counterparts, which might contribute to the superior thermotolerance and solubility (PubMed:26442587). K.marxianus could be therefore useful as a new model organism for further elucidation of the molecular details of autophagy (PubMed:26442587). Belongs to the ATG14 family.