Abstract
The ubiquitous distribution of zinc (Zn) in microbial, plant and animal cells suggests a wide range of potential functions for this transition element. The physiological role of Zn has centered on its interaction with enzymes. For example, the cessation of growth associated with nutritional Zn deficiency involves a reduction in DNA polymerase activity and concomitant reduction in DNA synthesis. Similarly, RNA polymerases I, II, and III are all Zn metalloenzymes and in appropriate model systems a reduction in the synthesis r-RNA, mRNA and t-RNA, respectively, is observed with cellular Zn depletion. The effect of Zn at the genetic level is most dramatically shown through induction of metallothionein synthesis. This protein influences the kinetics of Zn uptake by cells. It has been clearly demonstrated that metallothionein synthesis is under transcriptional control. Zinc and glucocorticoids, as well as glucagon and epinephrine (via elevation of cellular cAMP levels) all induce transcription of the metallothionein gene. Recently it has been shown that a 12 by fragment of the metallothionein gene promoter sequence regulates expression of heterologous genes in vivo, which demonstrates that Zn can have a direct effect on expression of specific genes. These results illustrate the potential of this relatively nontoxic metal in biotechnology applications where Zn responsive fusion genes could be utilized.
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© 1986 Martinus Nijhoff Publishers, Dordrecht
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Cousins, R.J. (1986). Molecular biology of zinc. In: Augustine, P.C., Danforth, H.D., Bakst, M.R. (eds) Biotechnology for Solving Agricultural Problems. Beltsville Symposia in Agricultural Research, vol 10. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4396-4_16
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DOI: https://doi.org/10.1007/978-94-009-4396-4_16
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