5'-nucleotidase from bull seminal plasma

Area of Science:

• Biochemistry
• Enzymology
• Reproductive Biology

Background:

• 5'-Nucleotidase (5'-ribonucleotide phosphohydrolase, EC 3.1.3.5) exhibits heterogeneity in bull seminal plasma.
• This heterogeneity is attributed to molecular aggregation and association with particulate matter, not distinct isoenzymes.

Purpose of the Study:

• To investigate the nature of 5'-nucleotidase heterogeneity in bull seminal plasma.
• To develop a purification strategy for the enzyme.
• To characterize the purified enzyme.

Main Methods:

• Detergent treatment to solubilize and resolve enzyme forms.
• Three-step chromatographic purification: DEAE-Sephadex A-50, concanavalin A-Sepharose 4B, and ADP-agarose.
• Characterization of enzyme properties.

Main Results:

• Detergent treatment yielded a single molecular form of 5'-nucleotidase.
• Purification involved negative adsorption and two affinity chromatography steps.
• The purified enzyme is a dimeric glycoprotein with characterized substrate specificity and response to pH and divalent cations.

Conclusions:

• The observed heterogeneity of bull seminal plasma 5'-nucleotidase is due to aggregation and particulate association, not isoenzymes.
• A robust purification protocol was established.
• The enzyme is a dimeric glycoprotein with specific biochemical properties.