A ribonuclease from human seminal plasma active on double-stranded RNA

Area of Science:

• Biochemistry
• Molecular Biology

Background:

• Ribonucleases (RNAases) play crucial roles in RNA metabolism.
• Human seminal plasma is a source of various proteins, including enzymes.

Purpose of the Study:

• To isolate and characterize a ribonuclease from human seminal plasma.
• To compare the activity and properties of human seminal RNAase with other known RNAases.

Main Methods:

• Enzyme isolation and purification from human seminal plasma.
• Enzyme activity assays using various RNA substrates (poly(A) x poly(U), poly(U), poly(C), viral RNA).
• Characterization of enzyme properties including molecular weight and amino acid composition.

Main Results:

• A highly purified ribonuclease was isolated from human seminal plasma with significant yield.
• Human seminal RNAase demonstrated broad substrate specificity, degrading single- and double-stranded RNAs.
• The enzyme showed significantly higher catalytic efficiency compared to bovine RNAase A for specific substrates.
• Two forms of the enzyme were identified, one glycosylated, with different molecular weights.
• Amino acid composition is similar to human pancreatic RNAase.

Conclusions:

• Human seminal plasma harbors a potent and efficient ribonuclease, likely originating from the prostate.
• This enzyme possesses unique properties and high activity, suggesting potential biological or diagnostic significance.