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Plant Physiology 67:1250-1254 (1981)
© 1981 American Society of Plant Biologists

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Articles

Light Requirement for Induction and Continuous Accumulation of an Ammonium-Inducible NADP-Specific Glutamate Dehydrogenase in Chlorella1

William T. Molin, Thomas P. Cunningham, Newell F. Bascomb, Larry H. White and Robert R. Schmidt2

Department of Biochemistry and Nutrition, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061

The ammonium-inducible NADP-specific glutamate dehydrogenase of Chlorella sorokiniana was shown to require light for both its induction by ammonia in uninduced cells, and its continuous accumulation in fully induced cells. Addition of ammonia to uninduced cells in the light resulted in a 35-minute induction lag followed by linear and coincident increases in enzyme activity and antigen. Enzyme activity was not induced in the dark; however, transfer of these cells to the light resulted in an immediate increase in enzyme activity and antigen. The absence of an induction lag suggested that mRNA sequences and/or an enzyme precursor with different antigenic properties than the active holoenzyme accumulated in cells in the dark in ammonium medium. When fully induced cells were transferred to the dark, the activity of the enzyme quickly ceased to accumulate. In contrast to the NADP-specific isozyme, the cells also contain a constitutive NAD-specific isozyme which was shown to accumulate in cells in the dark in either ammonium or nitrate medium.

2 Present address: Microbiology and Cell Science Department, University of Florida, Gainesville, FL 32611.

1 This research was supported by United States Public Health Grant 5 R01 GM 19871 from the National Institute of General Medical Sciences, National Institutes of Health.






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Copyright © 1981 by the American Society of Plant Biologists