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A PI(3,5)P2/CHMP4B axis on lysosomes is essential for microautophagic degradation of STING

by Higashiyama, Shigeki , Uchida, Yasunori , Yamamoto, Eiji , Shoji, Tsumugi , Shindo, Ruri , Koga, Daisuke , Ogino, Ryo , Yasumi, Takahiro , Shinojima, Ayumi , Taguchi, Tomohiko , Hirano, Yoshinori , Izawa, Kazushi , Kuchitsu, Yoshihiko , Hasegawa, Junya , Kishimoto, Takuma , Ikegami, Nana , Sato, Ryota , Shibata, Hirofumi , Kajiho, Hiroaki , Kusumi, Satoshi , Nakayama, Jun , Yumoto, Eisuke , Sato, Kanako , Sasaki, Takehiko

in 13 / 14/1 / 14/19 / 49 / 631/250/262/2106 / 631/80/39 / 631/80/474/1624 / Degradation / Encapsulation / Endosomes / Humanities and Social Sciences / Interferon / Kinases / Lipid kinase / Lipids / Lysosomes / Molecular modelling / multidisciplinary / Protease inhibitors / Proteins / Science / Science (multidisciplinary) / Stimulators

2026

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A PI(3,5)P2/CHMP4B axis on lysosomes is essential for microautophagic degradation of STING

2026

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2026

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Journal Article

A PI(3,5)P2/CHMP4B axis on lysosomes is essential for microautophagic degradation of STING

Higashiyama, Shigeki,

Uchida, Yasunori,

Yamamoto, Eiji,

Shoji, Tsumugi,

Shindo, Ruri,

Koga, Daisuke,

Ogino, Ryo,

Yasumi, Takahiro,

Shinojima, Ayumi,

Taguchi, Tomohiko,

Hirano, Yoshinori,

Izawa, Kazushi,

Kuchitsu, Yoshihiko,

Hasegawa, Junya,

Kishimoto, Takuma,

Ikegami, Nana,

Sato, Ryota,

Shibata, Hirofumi,

Kajiho, Hiroaki,

Kusumi, Satoshi,

Nakayama, Jun,

Yumoto, Eisuke,

Sato, Kanako,

Sasaki, Takehiko

2026

Overview

Stimulator of interferon genes (STING) is critical for the type I interferon responses to pathogen- or self-derived cytosolic DNA. STING signalling is terminated by ESCRT-driven lysosomal microautophagy. How STING is directly encapsulated by lysosomes has not yet been understood. Here we show that two lysosomal components, a phosphoinositide PI(3,5)P 2 and CHMP4B (a subunit of ESCRT-III subcomplex) are essential for STING encapsulation by lysosomes. Liposome sedimentation assay reveals that CHMP4B binds to PI(3,5)P 2 . The forced recruitment of the catalytic core of Pikfyve (a lipid kinase generating PI(3,5)P 2 ) to early endosomes, recruits a fraction of CHMP4B to early endosomes. CHMP4B mutant, defective in the binding to PI(3,5)P 2 , cannot restore the microautophagic degradation of STING or the resolution of the STING signalling in cells depleted of Chmp4b . Our results reveal a molecular mechanism that terminates innate immune signalling at the lysosomal membrane. Inhibition of Pikfyve, a kinase generating PI(3,5)P2, abolishes CHMP4B (an ESCRT-III subunit) recruitment to lysosomes, and leads to an accumulation of STING vesicles and sustained signaling. Our results reveal a lysosomal PI(3,5)P2/CHMP4B axis that terminates innate immune signaling.

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Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio

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/ 14/1

/ 14/19

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