Trace Metal Requirements and some Enzyme Systems in a Riboflavin-requiring Mutant of Neurospora crassa

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Abstract
This mutant has an absolute requirement for riboflavin when grown at 30[degree], but this requirement is less stringent when the organism is grown at 25[degree]. The metal requirements at either temperature are similar to those of the wild type so that it seems unlikely that they are involved in the biosynthesis of riboflavin. A study of enzyme patterns in the mutant, grown at 30[degree] and given optimal or deficient concentrations of riboflavin, demonstrated alternative pathways of electron transfer. When riboflavin is deficient, the iron enzymes are increased and O2 is probably the main terminal acceptor of electrons. At optimal concentrations of riboflavin, the flavoprotein enzymes are produced and nitrate and nitrite reductases are active so that nitrate can act as a terminal acceptor.

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