New insights into P2X7 receptor regulation: Ca(2+)-calmodulin and GDP bind to the soluble P2X7 ballast domain.
New insights into P2X7 receptor regulation: Ca(2+)-calmodulin and GDP bind to the soluble P2X7 ballast domain.
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DOI:
10.1016/j.jbc.2022.102495
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发表时间:
2022-10
影响因子:
4.8
通讯作者:
Tidow, Henning
中科院分区:
文献类型:
--
作者:
Sander, Simon;Mueller, Isabel;Garcia-Alai, Maria M.;Nicke, Annette;Tidow, Henning
P2X7 receptors are nonselective cation channels that are activated by extracellular ATP and play important roles in inflammation. They differ from other P2X family members by a large intracellular C-terminus that mediates diverse signaling processes that are little understood. A recent cryo-EM study revealed that the C-terminus of the P2X7 receptor forms a unique cytoplasmic ballast domain that possesses a GDP-binding site as well as a dinuclear Zn2+ site. However, the molecular basis for the regulatory function of the ballast domain as well as the interplay between the various ligands remain unclear. Here, we successfully expressed a soluble trimeric P2X7 ballast domain (P2X7BD) and characterized its ligand binding properties using a biophysical approach. We identified calmodulin (CaM)-binding regions within the ballast domain and found that binding of Ca2+-CaM and GDP to P2X7BD have opposite effects on its stability. Small-angle X-ray scattering experiments indicate that Ca2+-CaM binding disrupts the trimeric state of P2X7BD. Our results provide a possible framework for the intracellular regulation of the P2X7 receptor.
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影响因子:
3.5
作者:
Burnstock G;Knight GE
通讯作者:
Knight GE
影响因子:
64.8
作者:
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通讯作者:
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DOI:
10.1093/bioinformatics/btx846
发表时间:
2018-06-01
期刊:
Bioinformatics (Oxford, England)
影响因子:
--
作者:
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通讯作者:
Svergun DI
影响因子:
4.6
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Niebling S;Burastero O;Bürgi J;Günther C;Defelipe LA;Sander S;Gattkowski E;Anjanappa R;Wilmanns M;Springer S;Tidow H;García-Alai M
通讯作者:
García-Alai M
DOI:
10.1016/j.bbrc.2005.04.087
发表时间:
2005-06-24
影响因子:
3.1
作者:
Cheewatrakoolpong, B;Gilchrest, H;Greenfeder, S
通讯作者:
Greenfeder, S