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001-es BibID:	BIBFORM049385
Első szerző:	Csernoch László (élettanász)
Cím:	Estimation of Pore Geometry of RyR1 using Lanthanide Ruler / Laszlo Csernoch, Janos Almassy, Sandor Sarkozi, Balazs Lukacs, Istvan Jona
Dátum:	2012
ISSN:	0006-3495
Megjegyzések:	It was shown previously that the Ca analogue Gd inhibits RyR1 gating symmetrically with a Kd about 5.5 microM and Hill coefficient (nH) of 4 both on cis and trans side using single channel electrophysiology. We further tested the RyR1-lanthanide interaction using two lanthanides - having an ionic radii between Ca2+ and Gd3+ - by bilayer measurements and ryanodine binding experiments. Cis inhibition of RyR1 by Eu was characterized by a binding constant of Kd=167?5 nM and an nH of 2?0.1 while trans inhibition exhibits Kd=4.8?0.2 microM and nN of 5.2?1.2. The inhibition constants for Sm on the cis side are Kd=64.3?2.5 nM and nH=2.2?0.2 while on the trans side Kd=6.15?0.13 microM and nH=4.68?0.45. Inhibition by Eu and Sm are potential and polarity dependent in contrast to Gd due to the differences in ionic radii of these lanthanides. Increasing the ionic radius from 0.938 (Gd) to 0.964 (Sm) increased the binding affinity from 5.6 microM to 64.3 nM revealing that the size of Ca binding pocket is only slightly higher than the ionic radius of Sm. Ryanodine (Ry) binding experiments revealed that lanthanides bind - at least partially - to the regulatory Ca binding site because the dose response curve of 3H Ry binding starts with an increase of Ry binding, which amounts to about 40% for Eu and 70% for Sm of basic Ry binding. A model has been proposed for one possible spatial arrangement of lanthanide and calcium binding sites of the RyR1 pore based on the ionic radii of Ca and the tested lanthanides. Supported by OTKA 81923.1557-PosB327
Tárgyszavak:	Természettudományok Biológiai tudományok idézhető absztrakt calcium release
Megjelenés:	Biophysical Journal. - 102 : 3 Supplement (2012), p. 305a. -
További szerzők:	Almássy János (1981-) (élettanász, biológus, angol-magyar szakfordító) Sárközi Sándor (1966-) (élettanász) Lukács Balázs (1978-) (élettanász) Jóna István (1948-) (élettanász, fizikus)
Pályázati támogatás:	81923 OTKA
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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