Abstract

Extracts of Euglena contain at least two DNases. One, referred to as “Euglena acid DNase,” has a pH optimum of 4.6, and exhibits enzymic and purification properties similar to DNase II-like enzymes. The second DNase, referred to as “Euglena alkaline DNase,” has a pH optimum of 9.4, requires Ca 2+, and acts preferentially on heat-denatured DNA. Euglena alkaline DNase is either absent, present in low activity, or inhibited in dark-adapted cells; in addition, the activity of this DNase increases during light-induction of chloroplast development. We hypothesize that Euglena alkaline DNase is a chloroplast-related enzyme.

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