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The RCK1 Domain of ...
The RCK1 Domain of the Human BKCa Channel Transduces Ca2+ Binding into Structural Rearrangements
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- Yusifov, Taleh (författare)
- Division of Molecular Medicine, Department of Anesthesiology, David Geffen School of Medicine at University of California, Los Angeles, USA
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- Javaherian, Anoosh D. (författare)
- Division of Molecular Medicine, Department of Anesthesiology, David Geffen School of Medicine at University of California, Los Angeles, USA
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- Pantazis, Antonios, 1982- (författare)
- Division of Molecular Medicine, Department of Anesthesiology, David Geffen School of Medicine at University of California, Los Angeles, USA
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- Gandhi, Chris S. (författare)
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, USA
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- Olcese, Olcese (författare)
- Division of Molecular Medicine, Department of Anesthesiology, Cardiovascular Research Laboratory, and Brain Research Institute, David Geffen School of Medicine at University of California, Los Angeles, USA
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(creator_code:org_t)
- 2010-07-12
- 2010
- Engelska.
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Ingår i: The Journal of General Physiology. - : Rockefeller University Press. - 0022-1295 .- 1540-7748. ; 136:2, s. 189-202
- Relaterad länk:
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https://liu.diva-por... (primary) (Raw object)
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http://jgp.rupress.o...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Large-conductance voltage- and Ca2+-activated K+ (BKCa) channels play a fundamental role in cellular function by integrating information from their voltage and Ca2+ sensors to control membrane potential and Ca2+ homeostasis. The molecular mechanism of Ca2+-dependent regulation of BKCa channels is unknown, but likely relies on the operation of two cytosolic domains, regulator of K+ conductance (RCK)1 and RCK2. Using solution-based investigations, we demonstrate that the purified BKCa RCK1 domain adopts an α/β fold, binds Ca2+, and assembles into an octameric superstructure similar to prokaryotic RCK domains. Results from steady-state and time-resolved spectroscopy reveal Ca2+-induced conformational changes in physiologically relevant [Ca2+]. The neutralization of residues known to be involved in high-affinity Ca2+ sensing (D362 and D367) prevented Ca2+-induced structural transitions in RCK1 but did not abolish Ca2+ binding. We provide evidence that the RCK1 domain is a high-affinity Ca2+ sensor that transduces Ca2+ binding into structural rearrangements, likely representing elementary steps in the Ca2+-dependent activation of human BKCa channels.
Ämnesord
- NATURVETENSKAP -- Biologi -- Strukturbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Structural Biology (hsv//eng)
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