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• W2144043061 abstract "The kinetics of the creatine kinase (CK) reaction were studied in suspensions of quiescent and active, intact sea-urchin spermatozoa in artificial seawater, using 31P-NMR magnetization transfer. In inactive sperm, no CK-mediated exchange flux was detected, whereas in activated motile sperm, the forward pseudo-first-order rate constant was 0.13±0.04 s-1 at 10 °C, corresponding to a steady-state CK flux of 3.1±0.5 mM·s-1. Intracellular pH shifted from 6.6±0.1 to 7.6±0.1 upon activation. The phosphocreatine (PCr)/ATP and PCr/Pi ratios were only marginally reduced in activated sperm, whereas the estimated cytosolic free ADP concentration increased remarkably from 9 μM in quiescent, to 114 μM in activated spermatozoa. The elevation of CK flux upon sperm activation is discussed in the light of the proposition that in sea-urchin spermatozoa, which are fuelled entirely by oxidative phosphorylation, high-energy phosphate transport is mediated by a ‘CK/PCr shuttle‘." @default.
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• W2144043061 date "1997-07-15" @default.
• W2144043061 modified "2023-10-18" @default.
• W2144043061 title "Activation of sea-urchin sperm motility is accompanied by an increase in the creatine kinase exchange flux" @default.
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• W2144043061 doi "https://doi.org/10.1042/bj3250411" @default.
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