Abstract
After an electrophoretic separation of proteins from Euglena gracilis and dry seeds of Phaseolus vulgaris in native conditions in polyacrylamide gels, gels were incubated in mixtures containing NAD+, Mg-ATP2-, glucose 6-phosphate, G6P dehydrogenase, and either phenazine ethosulfate and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-tetrazolium bromide (PES/MTT) or phenazine methosulfate and nitro blue tetrazolium (PMS/NBT) as coupled redox system for NAD+ kinase activity detection. In the presence of PES/MTT, 4 bands were revealed for E. gracilis, among which two corresponded to NAD+ kinase activity, the other corresponding to a NAD+ reductase activity due to alcohol dehydrogenase (ADH). In the presence of PMS/NBT, only the bands of NAD+ kinase activity were revealed. With Phaseolus vulgaris, 3 bands of ADH were always revealed in both mixtures, and only the use of PMS/NBT allowed the detection of NAD+ kinase as a fourth band. With both materials, NAD+ reductase staining in gels was intensifed in the presence of GTP or ATP and even further with ADP or GDP. The results demonstrate that: 1) the NAD+ kinase and NAD+ reductase are two distinct enzymes; 2) the NAD+ reductase corresponds to ADH.
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Morere-Le Paven, MC., Montrichard, F., Lucet, I. et al. NAD+ Kinase Activities in Euglena Gracilis and Phaseolus Vulgaris. Biologia Plantarum 40, 565–574 (1997). https://doi.org/10.1023/A:1001705304104
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DOI: https://doi.org/10.1023/A:1001705304104