National Institutes of Health/Eunice Kennedy Shriver National Institute of Child Health & Human Development (NIH/NICHD)
R01HD061543
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM125629
米国
引用
ジャーナル: J Biol Chem / 年: 2018 タイトル: Cryo-EM structure of the cytoplasmic domain of murine transient receptor potential cation channel subfamily C member 6 (TRPC6). 著者: Caleigh M Azumaya / Francisco Sierra-Valdez / Julio F Cordero-Morales / Terunaga Nakagawa / 要旨: The kidney maintains the internal milieu by regulating the retention and excretion of proteins, ions, and small molecules. The glomerular podocyte forms the slit diaphragm of the ultrafiltration ...The kidney maintains the internal milieu by regulating the retention and excretion of proteins, ions, and small molecules. The glomerular podocyte forms the slit diaphragm of the ultrafiltration filter, whose damage leads to progressive kidney failure and focal segmental glomerulosclerosis (FSGS). The canonical transient receptor potential 6 (TRPC6) ion channel is expressed in the podocyte, and mutations in its cytoplasmic domain cause FSGS in humans. evaluation of disease-causing mutations in TRPC6 has revealed that these genetic alterations result in abnormal ion channel gating. However, the mechanism whereby the cytoplasmic domain modulates TRPC6 function is largely unknown. Here, we report a cryo-EM structure of the cytoplasmic domain of murine TRPC6 at 3.8 Å resolution. The cytoplasmic fold of TRPC6 is characterized by an inverted dome-like chamber pierced by four radial horizontal helices that converge into a vertical coiled-coil at the central axis. Unlike other TRP channels, TRPC6 displays a unique domain swap that occurs at the junction of the horizontal helices and coiled-coil. Multiple FSGS mutations converge at the buried interface between the vertical coiled-coil and the ankyrin repeats, which form the dome, suggesting these regions are critical for allosteric gating modulation. This functionally critical interface is a potential target for drug design. Importantly, dysfunction in other family members leads to learning deficits (TRPC1/4/5) and ataxia (TRPC3). Our data provide a structural framework for the mechanistic investigation of the TRPC family.
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 281.15 K / 装置: FEI VITROBOT MARK III 詳細: blotted for 8 seconds, 3 filter papers on each side.
詳細
Monodisperse
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
特殊光学系
球面収差補正装置: Microscope was modified with a Cs aberration corrector エネルギーフィルター - 名称: GIF Bioquantum エネルギーフィルター - エネルギー下限: 0 eV エネルギーフィルター - エネルギー上限: 20 eV