Modulates cell-to-cell trafficking. Interacts with ACBP6; interaction occurs at the plasma membrane. (Microbial infection) Interacts with Grapevine fanleaf virus (GFLV) 2B-MP. Co-localizes with the Grapevine fanleaf virus (GFLV) 2B-MP at the base of tubules within modified plasmodesmata (PubMed:20886105). Highly expressed in pollen, lateral root and elongation zone (PubMed:19704520). Higher expression in the reproductive tissues (flowers and buds) than in vegetative organs (leaves and stems). High expression in shoot and root phloem companion cells (at protein level) (PubMed:28786767). Affects accumulation of ACBP6 in the phloem. Belongs to the cysteine-rich repeat secretory protein family. Plasmodesmata-located proteins (PDLD) subfamily. PDLPs were initially named Cysteine-rich secretory proteins based on a classification work that failed to predict the transmembrane region at the C-terminus (PubMed:11402176). However, it was later shown that PDLPs are membrane proteins.