Abstract
Three enzymes contribute to the total hydroxylamine reductase activity of corn (Zea mays L.) scutellum extracts. Two of these resemble enzymes previously prepared from leaves, while the third, which accounts for a major part of the activity, appears to have no counterpart in leaf tissue. One of the hydroxylamine reductases found only in small amounts is associated with nitrite reductase and is induced, together with nitrite reductase, by nitrite. The other two enzymes are noninducible by nitrite and can be totally separated from nitrite reductase, which subsequently remains capable of catalyzing the reduction of nitrite to ammonia. Possible causes of the decline of hydroxylamine reductase activity during the induction of nitrite reductase are discussed.
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