Involved in male fertility. Required for manchette development and acrosome biogenesis during spermiogenesis (By similarity). Binds in vitro to phospholipids, including phosphatidylinositol 3-phosphate (PtdIns(3)P), phosphatidylinositol 4,5-bisphosphate (PtdIns(4,5)P2), phosphatidylinositol 4-phosphate (PtdIns(4)P) and phosphatidic acid (PA) . Contrary to other profilin family members, does not bind to actin in vitro .
Subcellular locations: Cytoplasm
In round spermatids, mainly observed in the acroplaxome. During the progression of spermiogenesis, relocalizes to the developing manchette of spermatids step 8 (S8). Coinciding with the initiation of manchette disassembly in spermatids S14, seen in the cytoplasm subjacent to the disassembling manchette.
Expressed in testis, in germ cells in seminiferous tubules (at protein level) (, ). Prominently expressed in pachytene/diplotene stage spematocytes .