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Partial deglycosylation of alpha subunit modifies sturgeon gonadotropin function
H Zenkevics1, V Vose, I Vosekalne
1Laboratory of Biochemistry, Institute of Biology, Latvian University, Salaspils. zenkevics@email.lubi.edu.lv
Abstract:
Chemical deglycosylation (dg) of sturgeon Acipenser gueldenstaedti Br. (alphaGTH) resulted in the loss of 83% of its initial carbohydrate content. It altered also recombinant dg alphaGTH + betaGTH dimer molecule, reducing its immunoreactivity by 30%, and fully blocking the hormonal function. CD spectroscopy showed that deglycosylation led to changes in the secondary structure of dg alphaGTH and in the alpha-beta recombinant. The sugar moiety of sturgeon alphaGTH is suggested to play an important role in maintaining the biological function of the hormone dimer molecule.
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