Pike eel (Muraenesox cinereus) gonadotropin

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Abstract
The amino acid sequences of pike eel gonadotropin α and β subunits have been determined by standard sequencing analytical methods. The α subunit is composed of 93 amino acid residues while the β subunit comprises 113 amino acid residues. All the invariant half-cystine residues are in the same positions as those found in other gonadotropins. It is noteworthy that the first, putative glycosylation site (Asn56) found in the α subunit of other gonadotropins was replaced by Asp56 in the α subunit of pike eel gonadotropin. Similarity analyses indicate that both subunits are structurally more similar to other known fish gonadotropin subunits than to those of the mammalian gonadotropins.