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001-es BibID:	BIBFORM049411
Első szerző:	Szentesi Péter (élettanász)
Cím:	Mutations in the scorpion toxin maurocalcine alter its ability to modify the calcium release events in frog skeletal muscle / P. Szentesi, J. Almássy, M. Fehér, B. Dienes, C. A. Simut, I. Jona, M. Ronjat, L. Csernoch
Dátum:	2006
Megjegyzések:	Maurocalcine (MCa), a 33 amino acid toxin obtained from the venom of Scorpio Maurus Palmatus, has been shown to interact with the isolated skeletal-type ryanodine receptor (RyR1) and to strongly modify its calcium channel gating. In this study, we explored the effects of MCa and its mutants (Lys8Ala, Lys19Ala and Lys22Ala) on elementary calcium release events in frog skeletal muscle fibers.Fibers were mechanically dissected, chemically skinned with saponin and imaged by a laser scanning confocal microscope in line scan mode in the presence of MCa and its mutants.Long lasting spontaneous calcium release events (embers), were observed after the addition of the toxins which were never seen under control conditions. Two typical forms of embers: with or without a classical spark were identified. The length of the embers correlated well with the duration of the long lasting sub-conductance states seen on MCa-modified RyR1-s incorporated into planar lipid bilayers. In particular, the Lys8Ala and Lys19Ala mutants had similar effects as the wild type MCa and produced long (430.9 ? 42.9, 442.6 ? 19.4 ms), while the Lys22Ala mutant induced shorter (65.3 ? 7.5 ms) events. Our observations indicate that the results from artificial lipid bilayer experiments mimic the in situ effects of MCa on RyR. We propose that an ember reflects the calcium release from a single release unit modified by the toxin.
Tárgyszavak:	Természettudományok Biológiai tudományok idézhető absztrakt calcium release
Megjelenés:	Journal of Muscle Research and Cell Motility. - 27 (2006), p. 516. -
További szerzők:	Almássy János (1981-) (élettanász, biológus, angol-magyar szakfordító) Fehér Miklós Dienes Beatrix (1972-) (élettanász, molekuláris biológus) Simut, Cecilia Jóna István (1948-) (élettanász, fizikus) Ronjat, Michel Csernoch László (1961-) (élettanász)
Internet cím:	Szerző által megadott URL Intézményi repozitóriumban (DEA) tárolt változat
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