5'-Nucleotidase: solubilization, radiochemical analysis, and electrophoresis

Area of Science:

• Biochemistry
• Cell Biology

Background:

• 5 '-Nucleotidase (5 '-NT) is an enzyme crucial for nucleotide metabolism.
• Understanding 5 '-NT isozyme characteristics is important for various cellular processes.

Purpose of the Study:

• To develop a method for solubilizing and assaying 5 '-NT activity from cultured cells.
• To characterize and differentiate 5 '-NT isozymes from human and rodent cells.

Main Methods:

• Solubilization of 5 '-NT using Zwittergent 314.
• Enzyme activity assay involving [14C]-AMP precipitation with lanthanum chloride.
• Isozyme separation via agarose gel electrophoresis and isoelectric focusing.

Main Results:

• Optimal 5 '-NT activity was achieved with 0.75% Zwittergent.
• Agarose gel electrophoresis showed distinct migration patterns for human and rat 5 '-NT isozymes.
• Isoelectric focusing resolved human fibroblast 5 '-NT into two forms (pH 5 and pH 6).

Conclusions:

• Zwittergent 314 is effective for solubilizing and assaying 5 '-NT.
• Electrophoretic and focusing techniques can differentiate 5 '-NT isozymes.
• Human fibroblasts possess at least two distinct 5 '-NT molecular forms.