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-Structure paper
| タイトル | Structural basis of auxin binding and transport by AUX1. |
|---|---|
| ジャーナル・号・ページ | Proc Natl Acad Sci U S A, Vol. 122, Issue 31, Page e2513424122, Year 2025 |
| 掲載日 | 2025年8月5日 |
著者 | Dan Jing / Fang Kong / Xiaoli Lu / Gaoxingyu Huang / Jing Huang / Haolin Wang / Yigong Shi / Chengcheng Wang / ![]() |
| PubMed 要旨 | Indole-3-acetic acid (IAA), the major form of auxin, is essential for plant growth. Auxin resistant 1 (AUX1), the first identified auxin importer, plays a crucial role in polar auxin transport (PAT). ...Indole-3-acetic acid (IAA), the major form of auxin, is essential for plant growth. Auxin resistant 1 (AUX1), the first identified auxin importer, plays a crucial role in polar auxin transport (PAT). Here, we present cryo-EM structures of AUX1 in the IAA-free and IAA-bound states. AUX1 exists as a monomer that contains 11 transmembrane helices (TMs). TMs 1 to 5 and 6 to 10 constitute the two halves of a classic LeuT-fold, and TM11 interacts with both halves at the interface. In the IAA-bound state, IAA is specifically recognized in a central pocket formed by TM1, TM3, TM6, and TM8. In the presence of IAA, TM1 and TM6 undergo marked conformational changes that are critical for IAA transport. His249 stands out to be a key residue for substrate uptake and release. Our structures reveal the molecular basis for AUX1-mediated IAA binding and transport. |
リンク | Proc Natl Acad Sci U S A / PubMed:40720658 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.52 - 3.97 Å |
| 構造データ | EMDB-63417, PDB-9lva: EMDB-63418, PDB-9lvb: |
| 化合物 | ![]() ChemComp-IAC: |
| 由来 |
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キーワード | PROTEIN TRANSPORT / transport / LeuT-fold / PROTEIN TRANSPORT/IMMUNE SYSTEM / PROTEIN TRANSPORT-IMMUNE SYSTEM complex |
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