Plays a role in vesicle-mediated protein trafficking to lysosomal compartments including the endocytic membrane transport and autophagic pathways. Believed to act as a core component of the putative HOPS and CORVET endosomal tethering complexes which are proposed to be involved in the Rab5-to-Rab7 endosome conversion probably implicating MON1A/B, and via binding SNAREs and SNARE complexes to mediate tethering and docking events during SNARE-mediated membrane fusion. The HOPS complex is proposed to be recruited to Rab7 on the late endosomal membrane and to regulate late endocytic, phagocytic and autophagic traffic towards lysosomes. The CORVET complex is proposed to function as a Rab5 effector to mediate early endosome fusion probably in specific endosome subpopulations (PubMed:11382755, PubMed:23351085, PubMed:24554770, PubMed:25266290, PubMed:25783203). Required for fusion of endosomes and autophagosomes with lysosomes (PubMed:25783203). Involved in cargo transport from early to late endosomes and required for the transition from early to late endosomes (PubMed:21148287). Involved in the retrograde Shiga toxin transport (PubMed:23593995). Core component of at least two putative endosomal tethering complexes, the homotypic fusion and vacuole protein sorting (HOPS) complex and the class C core vacuole/endosome tethering (CORVET) complex. Their common core is composed of the class C Vps proteins VPS11, VPS16, VPS18 and VPS33A, which in HOPS further associates with VPS39 and VPS41 and in CORVET with VPS8 and TGFBRAP1 (PubMed:11382755, PubMed:20434987, PubMed:23351085, PubMed:23901104, PubMed:25266290, PubMed:25783203). Interacts with TGFBRAP1, MON1B, STX7, STX17, EZR, RDX, MSN, ECPAS (PubMed:11382755, PubMed:20682791, PubMed:21148287, PubMed:24554770, PubMed:25266290). Interacts with RAB5C (By similarity). Associates with adaptor protein complex 3 (AP-3) and clathrin:AP-3 complexes (By similarity). Interacts with PLEKHM1 (PubMed:28325809). Ubiquitous. Expression was highest in heart and low in lung. The disease is caused by variants affecting the gene represented in this entry. The disease may be caused by variants affecting the gene represented in this entry. Belongs to the VPS11 family. Truncated N-terminus.