Flavoenzyme Models. I. Flavin Free-Radical Formation in the Reduced Nicotinamide-Adenine Dinucleotide-Flavin Mononucleotide System*

Biochemistry ◽  
1966 ◽  
Vol 5 (12) ◽  
pp. 3865-3872 ◽  
Author(s):  
J. Lawrence Fox ◽  
Gordon Tollin
Keyword(s):  
Free Radical ◽  
Nicotinamide Adenine Dinucleotide ◽  
Radical Formation ◽  
Nicotinamide Adenine ◽  
Flavin Mononucleotide ◽  
Free Radical Formation ◽  
Reduced Nicotinamide Adenine Dinucleotide

Soluble reduced nicotinamide adenine dinucleotide oxidase from Bacillus cereus T spores and vegetative cells. II. Properties

1969 ◽  
Vol 15 (11) ◽  
pp. 1313-1317 ◽  
Author(s):  
D. H. Ashton ◽  
L. C. Blankenship
Keyword(s):  
Bacillus Cereus ◽  
Nicotinamide Adenine Dinucleotide ◽  
Vegetative Cell ◽  
Thermal Inactivation ◽  
Dipicolinic Acid ◽  
Heat Treatments ◽  
Nicotinamide Adenine ◽  
Flavin Mononucleotide ◽  
Vegetative Cells ◽  
Reduced Nicotinamide Adenine Dinucleotide

Two soluble reduced nicotinamide adenine dinucleotide (NADH2) oxidases purified from extracts of Bacillus cereus T spores were compared with vegetative ceil soluble NADH2 oxidase. The minor spore component and vegetative cell soluble NADH2 oxidase reacted equally well with riboflavin or flavin mononucleotide (FMN), were inhibited by 15 mM dipicolinic acid (DPA), and possessed similar thermal inactivation characteristics at 80 °C. Activity of the major spore component was stimulated by a factor of 3.6 when riboflavin replaced FMN as the coenzyme. The major spore component was not inhibited by DPA and resisted heat treatments which inactivated vegetative cell soluble NADH2 oxidase. These observations indicate that the minor spore component and vegetative cell soluble NADH2 oxidase are identical while the major spore component is a distinct protein.

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