Plasma Serine Protease Inhibitor

**Semantic type:** Amino Acid, Peptide, or Protein

**Definition:** Plasma serine protease inhibitor (406 aa, ~46 kDa) is encoded by the human SERPINA5 gene. This protein is involved in the regulation of serine proteinases, spermatogenesis and fusion of sperm with the plasma membrane of an egg.

**Synonyms:** - Acrosomal Serine Protease Inhibitor - Alpha-1 Antiproteinase - Antitrypsin - PAI-3 - PCI - PLANH3 - PROCI - Plasminogen Activator Inhibitor III - Plasminogen Activator Inhibitor-3 - Protein C Inhibitor - SERPINA5 - Serine or Cysteine Proteinase Inhibitor Clade A Member 5 - Serpin A5