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Control of flatfish sperm motility by CO2 and carbonic anhydrase

Control of flatfish sperm motility by CO2 and carbonic anhydrase

Cell Motility and the Cytoskeleton 55(3): 174-187

ISSN/ISBN: 0886-1544

PMID: 12789662

DOI: 10.1002/cm.10119

Sperm motility in flatfishes shows unique characteristics. The flagellar movement either in vivo or in permeabilized models is arrested by the presence of 25-100 mM HCO3-, or by gentle perfusion with CO2 gas. To understand the molecular basis of this property, sperm Triton-soluble proteins and flagellar proteins from several species were analyzed by sodium dodecyl sulfate polyacrylamide gel electrophoresis. An abundant 29-kDa protein was observed only in flatfish species. Partial amino acid sequences identified this protein as a carbonic anhydrase, an enzyme involved in the interconversion of CO2 and HCO3-. 6-ethoxyzolamide, a specific inhibitor of carbonic anhydrase inhibits sperm motility, especially at low pH. In the case of HCO3(-)-arrested sperm, the motility is restored by addition of 6-ethoxyzolamide. Taken together, these results suggest that a novel pH/HCO3(-)-dependent regulatory mechanism mediated by carbonic anhydrase is involved in the motility control in flatfish sperm.

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Accession: 003694020

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