Signal_transduction_in_sea-urchin_sperm_chemotaxis.jpg
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Summary
Description Signal transduction in sea-urchin sperm chemotaxis.jpg |
English:
A model of the signal-transduction pathway during chemotaxis of the sea urchin Arbacia punctulata. Binding of a chemoattractant (ligand) to the receptor — a membrane-bound guanylyl cyclase (GC) — activates the synthesis of cGMP from GTP. Cyclic GMP possibly opens cyclic nucleotide-gated (CNG) K+-selective channels, thereby causing hyperpolarization of the membrane. The cGMP signal is terminated by the hydrolysis of cGMP through phosphodiesterase (PDE) activity and inactivation of GC. On hyperpolarization, hyperpolarization-activated and cyclic nucleotide-gated (HCN) channels allow the influx of Na+ that leads to depolarization and thereby causes a rapid Ca2+ entry through voltage-activated Ca2+ channels (Cav), Ca2+ ions interact by unknown mechanisms with the axoneme of the flagellum and cause an increase of the asymmetry of flagellar beat and eventually a turn or bend in the swimming trajectory. Ca2+ is removed from the flagellum by a Na+/Ca2+ exchange mechanism. [Taken from (Kaupp et al., 2006).]
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Date | |
Source | ftp://ftp.weizmann.ac.il/incoming/Fig.1.jpg |
Author | Prof. Dr. U.B. Kaupp |
Permission
( Reusing this file ) |
ftp://ftp.weizmann.ac.il/incoming/License_for_Fig1.pdf |
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Licensing
This file is licensed under the
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Attribution-Share Alike 3.0 Unported
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Attribution:
Prof. Dr. U.B. Kaupp
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