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-Structure paper
| タイトル | Puromycin-sensitive aminopeptidase acts as an inhibitory auxiliary subunit of volume-regulated anion channels and regulates cGAMP transport. |
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| ジャーナル・号・ページ | Mol Cell, Vol. 85, Issue 24, Page 4621-44632.e7, Year 2025 |
| 掲載日 | 2025年12月18日 |
著者 | Wenqiang Zheng / Tatsuya Hagino / Hao Wang / Henry Yi Cheng / Nicholas Koylass / Kevin Hong Chen / Haobo Wang / Sepehr Mani / Anish Kumar Mondal / Edward C Twomey / Zhaozhu Qiu / ![]() |
| PubMed 要旨 | Volume-regulated anion channels (VRACs) are large-pore channels expressed in most vertebrate cells and are critical for cell volume regulation and autocrine/paracrine signaling. Here, we identify the ...Volume-regulated anion channels (VRACs) are large-pore channels expressed in most vertebrate cells and are critical for cell volume regulation and autocrine/paracrine signaling. Here, we identify the ubiquitously expressed puromycin-sensitive aminopeptidase (PSA) as a binding partner of the obligatory VRAC subunit SWELL1 (also known as LRRC8A) and determine the cryo-electron microscopy structure of the SWELL1-PSA complex. Three PSA molecules bind a single SWELL1 hexamer, coupling adjacent leucine-rich repeat (LRR) domains into local dimers. Functionally, PSA overexpression suppresses VRAC activation, whereas PSA deletion dramatically elevates basal channel activity. Notably, PSA's modulation of VRACs requires physical binding but not aminopeptidase activity, indicating a structural mechanism. Our findings identify PSA as an auxiliary subunit of VRACs, highlight the role of intracellular LRR domains in allosteric channel gating, and suggest a strategy to tune VRAC function in diverse physiological contexts, including 2'3'-cyclic GMP-AMP (cGAMP) transport and downstream stimulator of interferon genes (STING) signaling. |
リンク | Mol Cell / PubMed:41371222 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.19 Å |
| 構造データ | EMDB-70143, PDB-9o5k: |
| 由来 |
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キーワード | MEMBRANE PROTEIN / Hetero-complex / Ion channel / Modulator |
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