Abstract
A λgt11 clone encoding prostate specific antigen has been isolated from a human prostate cDNA library. The cDNA insert of 1415 nucleotides hybridizes specifically to a prostate mRNA species of 1.5 kb. The nucleotide sequence codes for part of a signal peptide, a short propiece and the mature protein of 237 amino acid residues. The M r for the non‐glycosylated protein was 26 089. One potential site for N‐linked carbohydrate attachment was identified. The primary structure shows extensive homology with proteases of the kallikrein family.