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Updated: Feb 11, 2026

Bottlenose Dolphin Tursiops truncatus Spermatozoa: Collection, Cryopreservation, and Heterologous In Vitro Fertilization
Published on: August 21, 2017
Identification of 66 kDa phosphoprotein associated with motility initiation of hamster spermatozoa
Masakatsu Fujinoki1, Takeshi Kawamura2, Toshifusa Toda3
1Department of Physiology, Dokkyo University School of Medicine, Mibu, Tochigi.
Abstract:
Background and Aims: Sperm motility is regulated by protein phosphorylation. The 66 kDa protein obtained from hamster sperm flagella was phosphorylated at serine residues associated with the motility initiation. In order to understand the regulatory mechanism of sperm motility, the 66 kDa protein was identified in the present study. Methods: The 66 kDa protein was purified by 2-D gel electrophoresis and identified by matrix-assisted laser desorption ionization mass spectrometry, liquid chromatography-tandem mass spectrometry and peptide sequencer. Results: The 66 kDa protein was tubulin β chain. Conclusion: The 66 kDa protein is one of the tubulin β chain isoforms and phosphorylated in relation to the motility initiation. (Reprod Med Biol 2004; 3: 133-139).
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