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      Intricate Regulation of Tyrosine Hydroxylase Activity and Gene Expression

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      Journal of Neurochemistry

      Wiley

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          Abstract

          Tyrosine hydroxylase catalyzes the rate-limiting step in the biosynthesis of the catecholamines dopamine, norepinephrine, and epinephrine. Therefore, the regulation of tyrosine hydroxylase enzyme number and intrinsic enzyme activity represents the central means for controlling the synthesis of these important biogenic amines. An intricate scheme has evolved whereby tyrosine hydroxylase activity is modulated by nearly every documented form of regulation. Beginning with the genomic DNA, evidence exists for the transcriptional regulation of tyrosine hydroxylase mRNA levels, alternative RNA processing, and the regulation of RNA stability. There is also experimental support for the role of both translational control and enzyme stability in establishing steady-state levels of active tyrosine hydroxylase protein. Finally, mechanisms have been proposed for feedback inhibition of the enzyme by catecholamine products, allosteric modulation of enzyme activity, and phosphorylation-dependent activation of the enzyme by various different kinase systems. Given the growing literature suggesting that different tissues regulate tyrosine hydroxylase mRNA levels and activity in different ways, regulatory mechanisms provide not only redundancy but also diversity in the control of catecholamine biosynthesis.

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          Author and article information

          Journal
          Journal of Neurochemistry
          Journal of Neurochemistry
          Wiley
          00223042
          14714159
          August 1996
          November 23 2002
          : 67
          : 2
          : 443-462
          Article
          10.1046/j.1471-4159.1996.67020443.x
          8764568
          © 2002

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