The function of ACP2 (acid phosphatase 2, lysosomal, Ensembl gene identifier ENSG00000134575) is as follows. Lysosomal acid phosphatase that catalyzes the hydrolysis of orthophosphoric monoesters to alcohols and phosphate under acidic conditions (Probable) (PubMed:6090300). May contribute to the removal of mannose-6-phosphate (Man6P) from lysosomal proteins after their delivery to lysosomes, acting in concert with ACP5 (By similarity). {ECO:0000250|UniProtKB:P24638, ECO:0000269|PubMed:6090300, ECO:0000305|PubMed:3191910}. (Microbial infection) Plays a crucial role in the membrane fusion step of the influenza A and B viruses entry process. .