May play a role in membrane trafficking. Interacts with TCB1 and TCB3 via its C-terminal domain. Traffics from the cell surface to intracellular vesicles near the vacuole (PubMed:15141306). More enriched in the cortical endoplasmic reticulum (ER) that is closely apposed to the cell membrane than in the perinuclear ER or internal ER tubules that connect the nucleus to the cortical ER (PubMed:22250200). The SMP-LTD domain is a barrel-like domain that can bind various types of glycerophospholipids in its interior and mediate their transfer between two adjacent bilayers. The C2 domains show Ca(2+)-independent phospholipid binding. None of the C2 domains retains all 5 conserved Asp residues found in calcium-binding C2 domains. Present with 2630 molecules/cell in log phase SD medium. Belongs to the tricalbin family.