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- EMDB-64490: influx carrier apo form -

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Basic information

Entry
Database: EMDB / ID: EMD-64490
Titleinflux carrier apo form
Map data
Sample
  • Organelle or cellular component: plant influx carrier apo form
    • Protein or peptide: Auxin transporter protein 1
Keywordshormone transporter / HORMONE
Function / homology
Function and homology information


root hair cell differentiation / auxin binding / root cap development / somatic embryogenesis / lateral root formation / auxin influx transmembrane transporter activity / positive gravitropism / establishment of planar polarity / auxin polar transport / amino acid transmembrane transport ...root hair cell differentiation / auxin binding / root cap development / somatic embryogenesis / lateral root formation / auxin influx transmembrane transporter activity / positive gravitropism / establishment of planar polarity / auxin polar transport / amino acid transmembrane transport / auxin-activated signaling pathway / response to nematode / symporter activity / amino acid transmembrane transporter activity / endosome / cell surface / Golgi apparatus / plasma membrane
Similarity search - Function
Amino acid transporter, transmembrane domain / Transmembrane amino acid transporter protein
Similarity search - Domain/homology
Auxin transporter protein 1
Similarity search - Component
Biological speciesArabidopsis thaliana (thale cress)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.26 Å
AuthorsChen H / Jiang D
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Mol Plant / Year: 2025
Title: Structural basis of auxin recognition and transport by the plant influx carrier AUX1.
Authors: Huiwen Chen / Junping Fan / Cheng Chi / Jun Zhao / Di Wu / Xiaoguang Lei / Xing Wang Deng / Daohua Jiang /
Abstract: Auxin regulates numerous aspects of plant growth and development, featuring polar auxin transport mediated by auxin efflux and influx carriers. AUX1 is the major auxin importer that actively takes up ...Auxin regulates numerous aspects of plant growth and development, featuring polar auxin transport mediated by auxin efflux and influx carriers. AUX1 is the major auxin importer that actively takes up natural and synthetic auxins. However, the precise mechanisms underlying AUX1-mediated auxin recognition and transport remain elusive. Here, we present cryoelectron microscopy structures of Arabidopsis thaliana AUX1 in both apo and auxin-bound states, revealing the structural basis for auxin recognition. Structural analyses show that AUX1 assumes the LeuT-like fold in an inward-facing conformation and the auxin analog 2,4-D is recognized by polar residues located in the central cavity of AUX1. Furthermore, we identify a putative cation-binding site that contributes to stabilizing the inward-facing conformation. Interestingly, we reveal that His249 undergoes a substantial conformational shift, and its mutation completely abolishes transport activity, suggesting a crucial role for His249 in AUX1 gating. Collectively, this study provides a structural foundation for a deeper understanding of auxin influx by AUX1-like carriers.
History
DepositionMay 3, 2025-
Header (metadata) releaseDec 24, 2025-
Map releaseDec 24, 2025-
UpdateDec 24, 2025-
Current statusDec 24, 2025Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_64490.png

Downloads & links

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Map

FileDownload / File: emd_64490.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

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AxesZ (Sec.)Y (Row.)X (Col.)
0.85 Å/pix.
x 320 pix.
= 272. Å		0.85 Å/pix.
x 320 pix.
= 272. Å		0.85 Å/pix.
x 320 pix.
= 272. Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.85 Å
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Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.23
Minimum - Maximum-1.1599979 - 1.5987847
Average (Standard dev.)-0.00014093811 (±0.026944647)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 272.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_64490_half_map_1.map
Projections & Slices
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Half map: #1

Fileemd_64490_half_map_2.map
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Sample components

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Entire : plant influx carrier apo form

EntireName: plant influx carrier apo form
Components
  • Organelle or cellular component: plant influx carrier apo form
    • Protein or peptide: Auxin transporter protein 1

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Supramolecule #1: plant influx carrier apo form

SupramoleculeName: plant influx carrier apo form / type: organelle_or_cellular_component / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Arabidopsis thaliana (thale cress)

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Macromolecule #1: Auxin transporter protein 1

MacromoleculeName: Auxin transporter protein 1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Arabidopsis thaliana (thale cress)
Molecular weightTheoretical: 54.10552 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MSEGVEAIVA NDNGTDQVNG NRTGKDNEEH DGSTGSNLSN FLWHGGSVWD AWFSCASNQV AQVLLTLPYS FSQLGMLSGI VLQIFYGLL GSWTAYLISV LYVEYRARKE KEGKSFKNHV IQWFEVLDGL LGSYWKALGL AFNCTFLLFG SVIQLIACAS N IYYINDHL ...String:
MSEGVEAIVA NDNGTDQVNG NRTGKDNEEH DGSTGSNLSN FLWHGGSVWD AWFSCASNQV AQVLLTLPYS FSQLGMLSGI VLQIFYGLL GSWTAYLISV LYVEYRARKE KEGKSFKNHV IQWFEVLDGL LGSYWKALGL AFNCTFLLFG SVIQLIACAS N IYYINDHL DKRTWTYIFG ACCATTVFIP SFHNYRIWSF LGLGMTTYTA WYLAIASIIH GQAEGVKHSG PTKLVLYFTG AT NILYTFG GHAVTVEIMH AMWKPQKFKY IYLMATLYVF TLTIPSAAAV YWAFGDALLD HSNAFSLMPK NAWRDAAVIL MLI HQFITF GFACTPLYFV WEKVIGMHDT KSICLRALAR LPVVIPIWFL AIIFPFFGPI NSAVGALLVS FTVYIIPSLA HMLT YRSAS ARQNAAEKPP FFMPSWTAMY VLNAFVVVWV LIVGFGFGGW ASVTNFVRQV DTFGLFAKCY QCKPAAAAAH APVSA LHHR L

UniProtKB: Auxin transporter protein 1

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration10 mg/mL
BufferpH: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS TITAN THEMIS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 µm

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.26 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 152416
Initial angle assignmentType: RANDOM ASSIGNMENT
Final angle assignmentType: MAXIMUM LIKELIHOOD

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