Structural and functional insights into the lipid regulation of human anion exchanger 2

Weiqi Zhang, Dian Ding, Yishuo Lu, Hongyi Chen, Peijun Jiang, Peng Zuo, Guangxi Wang, Juan Luo, Yue Yin, Jianyuan Luo and Yuxin Yin ()
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Weiqi Zhang: Peking-Tsinghua Center for Life Sciences, School of Basic Medical Sciences, Peking University Health Science Center
Dian Ding: Peking-Tsinghua Center for Life Sciences, School of Basic Medical Sciences, Peking University Health Science Center
Yishuo Lu: Peking-Tsinghua Center for Life Sciences, School of Basic Medical Sciences, Peking University Health Science Center
Hongyi Chen: Peking-Tsinghua Center for Life Sciences, School of Basic Medical Sciences, Peking University Health Science Center
Peijun Jiang: Peking-Tsinghua Center for Life Sciences, School of Basic Medical Sciences, Peking University Health Science Center
Peng Zuo: Peking-Tsinghua Center for Life Sciences, School of Basic Medical Sciences, Peking University Health Science Center
Guangxi Wang: Peking-Tsinghua Center for Life Sciences, School of Basic Medical Sciences, Peking University Health Science Center
Juan Luo: Peking University Shenzhen Hospital
Yue Yin: Peking University Health Science Center
Jianyuan Luo: Peking University Health Science Center
Yuxin Yin: Peking-Tsinghua Center for Life Sciences, School of Basic Medical Sciences, Peking University Health Science Center

Nature Communications, 2024, vol. 15, issue 1, 1-10

Abstract: Abstract Anion exchanger 2 (AE2) is an electroneutral Na+-independent Cl-/HCO3- exchanger belongs to the SLC4 transporter family. The widely expressed AE2 participates in a variety of physiological processes, including transepithelial acid-base secretion and osteoclastogenesis. Both the transmembrane domains (TMDs) and the N-terminal cytoplasmic domain (NTD) are involved in regulation of AE2 activity. However, the regulatory mechanism remains unclear. Here, we report a 3.2 Å cryo-EM structure of the AE2 TMDs in complex with PIP2 and a 3.3 Å full-length mutant AE2 structure in the resting state without PIP2. We demonstrate that PIP2 at the TMD dimer interface is involved in the substrate exchange process. Mutation in the PIP2 binding site leads to the displacement of TM7 and further stabilizes the interaction between the TMD and the NTD. Reduced substrate transport activity and conformation similar to AE2 in acidic pH indicating the central contribution of PIP2 to the function of AE2.

Date: 2024
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DOI: 10.1038/s41467-024-44966-0

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