Molecular cloning of human prostate specific antigen cDNA

Area of Science:

• Molecular Biology
• Biochemistry
• Genetics

Background:

• Prostate specific antigen (PSA) is a key biomarker in prostate cancer diagnosis and management.
• Understanding the genetic and protein structure of PSA is crucial for developing targeted therapies and diagnostic tools.

Purpose of the Study:

• To isolate and characterize the gene encoding prostate specific antigen (PSA) from a human prostate cDNA library.
• To determine the nucleotide sequence and deduce the amino acid sequence of PSA.
• To investigate the structural and functional relationship of PSA to other proteins.

Main Methods:

• Isolation of a lambda gt11 clone encoding PSA from a human prostate cDNA library.
• Hybridization analysis to confirm the specificity of the cDNA insert for prostate mRNA.
• Nucleotide sequencing of the cDNA insert.
• Bioinformatic analysis to predict protein structure and identify functional domains.

Main Results:

• A cDNA clone encoding PSA was successfully isolated, with an insert of 1415 nucleotides.
• The cDNA specifically hybridized to a 1.5 kb prostate mRNA species.
• The nucleotide sequence predicted a mature PSA protein of 237 amino acid residues, including a signal peptide and propiece.
• The non-glycosylated PSA protein has a molecular weight of 26,089 Da, with one potential N-linked glycosylation site.
• Primary structure analysis revealed significant homology to proteases within the kallikrein family.

Conclusions:

• The isolated PSA cDNA provides a complete coding sequence for the PSA protein.
• The structural analysis confirms PSA as a member of the kallikrein protease family.
• This characterization facilitates further research into PSA function and its role in prostate health and disease.