Binds to phosphatidylinositol 3-phosphate (PtdIns(3)P), phosphatidylinositol 4,5-bisphosphate (PtdIns(4,5)P2), phosphatidylinositol 4-phosphate (PtdIns(4)P) and phosphatidic acid (PA). Does not bind to actin, contrary to other family members (By similarity). Localizes first in the acroplaxome and later in the manchette during spermatid head development. Localized mainly in the developing acrosome of haploid germ cells. Detected in seminiferous tubules (at protein level). Detected in spermatocytes and spermatids. Not detected in spermatogonium. Expression coincides with the onset of meiosis. Detected in nearly all stages of spermiogenesis (at protein level). Belongs to the profilin family.