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Role of Tyrosine Hydroxylase in the Blood of the Ghost Crab DcΥPode PlatΥTarsis H. Milne Edwards, 1852 (Decapoda, Brachyura)

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image of Crustaceana

The blood of Ocypode platytarsis contains a single fraction of tyrosine hydroxylase (E.C., which is capable of converting the monophenol into O-diphenol and 3 fractions of phenoloxidase (E.C., which convert O-diphenol into quinone. The phenoloxidases do not show any monophenoloxidase activity. The phenoloxidase fractions exist as proenzyme and can be activated by sodium dodecyl sulphate. Tyrosine hydroxylase may be involved in the synthesis of O-diphenol. The stored O-diphenol may be oxidised into melanin during immunological response, after the activation of prophenoloxidase. Thin layer chromatographic analysis reveals that there is an accumulation of dopa methyl ester in the reaction medium containing the enzyme sample, tyrosine methyl ester and phenylthiourea (PTU), a specific inhibitor of phenoloxidase. In the absence of PTU, the reaction medium becomes brown and there is no accumulation of O-diphenol.

Affiliations: 1: Department of Zoology, University of Madras, Guindy Campus, Madras - 600 025, India


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