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Enhancement of Ribonucleotide Reductase Activity at Low Enzyme Concentrations by Polyethylene Glycol
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The estimation of ribonucleotide reductase in cell extracts has been problematical
on account of abnormally low activities at low enzyme concentrations, presumably due
to subunit dissociation. This problem can be alleviated by assaying the enzyme in the presence
of polyethylene glycol. The presence of 15 % polyethylene glycol during the assay greatly
stimulated ribonucleotide reductase activity at low enzyme concentrations and allowed measurement
of enzyme activity in as little as 10^5 mouse L929 cells, a 30-fold enhancement of
assay sensitivity. Enzyme activity measured in the presence of 15 % polyethylene glycol was
proportional to enzyme concentration, thus making possible the accurate measurement of
very low levels of ribonucleotide reductase.
Title: Enhancement of Ribonucleotide Reductase Activity at Low
Enzyme Concentrations by Polyethylene Glycol
Description:
The estimation of ribonucleotide reductase in cell extracts has been problematical
on account of abnormally low activities at low enzyme concentrations, presumably due
to subunit dissociation.
This problem can be alleviated by assaying the enzyme in the presence
of polyethylene glycol.
The presence of 15 % polyethylene glycol during the assay greatly
stimulated ribonucleotide reductase activity at low enzyme concentrations and allowed measurement
of enzyme activity in as little as 10^5 mouse L929 cells, a 30-fold enhancement of
assay sensitivity.
Enzyme activity measured in the presence of 15 % polyethylene glycol was
proportional to enzyme concentration, thus making possible the accurate measurement of
very low levels of ribonucleotide reductase.
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