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- EMDB-34176: Structure of hSLC19A1+5-MTHF -

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Basic information

Entry
Database: EMDB / ID: EMD-34176
TitleStructure of hSLC19A1+5-MTHF
Map data
Sample
  • Complex: SLC19A1+5-MTHF
    • Protein or peptide: Reduced folate transporter
  • Ligand: N-[4-({[(6S)-2-AMINO-4-HYDROXY-5-METHYL-5,6,7,8-TETRAHYDROPTERIDIN-6-YL]METHYL}AMINO)BENZOYL]-L-GLUTAMIC ACID
KeywordshSLC19A1+5-MTHF complex / MEMBRANE PROTEIN
Function / homology
Function and homology information


folic acid transmembrane transporter activity / folate:monoatomic anion antiporter activity / methotrexate transport / methotrexate transmembrane transporter activity / folic acid transport / folate transmembrane transport / folate import across plasma membrane / positive regulation of cGAS/STING signaling pathway / cyclic-GMP-AMP transmembrane transporter activity / cyclic-GMP-AMP transmembrane import across plasma membrane ...folic acid transmembrane transporter activity / folate:monoatomic anion antiporter activity / methotrexate transport / methotrexate transmembrane transporter activity / folic acid transport / folate transmembrane transport / folate import across plasma membrane / positive regulation of cGAS/STING signaling pathway / cyclic-GMP-AMP transmembrane transporter activity / cyclic-GMP-AMP transmembrane import across plasma membrane / 2',3'-cyclic GMP-AMP binding / organic anion transport / xenobiotic transmembrane transport / organic anion transmembrane transporter activity / Metabolism of folate and pterines / antiporter activity / folic acid binding / folic acid metabolic process / xenobiotic transmembrane transporter activity / transport across blood-brain barrier / female pregnancy / brush border membrane / basolateral plasma membrane / apical plasma membrane / plasma membrane
Similarity search - Function
Reduced folate transporter SLC19A1 / Reduced folate carrier / Reduced folate carrier / MFS transporter superfamily
Similarity search - Domain/homology
Reduced folate transporter
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.0 Å
AuthorsZhang QX / Zhang XY / Zhu YL / Sun PP / Gao A / Zhang LG / Gao P
Funding support China, 5 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32130057 China
National Natural Science Foundation of China (NSFC)31922037 China
National Natural Science Foundation of China (NSFC)81921005 China
National Natural Science Foundation of China (NSFC)32171219 China
National Natural Science Foundation of China (NSFC)82001681 China
CitationJournal: Nature / Year: 2022
Title: Recognition of cyclic dinucleotides and folates by human SLC19A1.
Authors: Qixiang Zhang / Xuyuan Zhang / Yalan Zhu / Panpan Sun / Liwei Zhang / Junxiao Ma / Yong Zhang / Lingan Zeng / Xiaohua Nie / Yina Gao / Zhaolong Li / Songqing Liu / Jizhong Lou / Ang Gao / Liguo Zhang / Pu Gao /
Abstract: Cyclic dinucleotides (CDNs) are ubiquitous signalling molecules in all domains of life. Mammalian cells produce one CDN, 2'3'-cGAMP, through cyclic GMP-AMP synthase after detecting cytosolic DNA ...Cyclic dinucleotides (CDNs) are ubiquitous signalling molecules in all domains of life. Mammalian cells produce one CDN, 2'3'-cGAMP, through cyclic GMP-AMP synthase after detecting cytosolic DNA signals. 2'3'-cGAMP, as well as bacterial and synthetic CDN analogues, can act as second messengers to activate stimulator of interferon genes (STING) and elicit broad downstream responses. Extracellular CDNs must traverse the cell membrane to activate STING, a process that is dependent on the solute carrier SLC19A1. Moreover, SLC19A1 represents the major transporter for folate nutrients and antifolate therapeutics, thereby placing SLC19A1 as a key factor in multiple physiological and pathological processes. How SLC19A1 recognizes and transports CDNs, folate and antifolate is unclear. Here we report cryo-electron microscopy structures of human SLC19A1 (hSLC19A1) in a substrate-free state and in complexes with multiple CDNs from different sources, a predominant natural folate and a new-generation antifolate drug. The structural and mutagenesis results demonstrate that hSLC19A1 uses unique yet divergent mechanisms to recognize CDN- and folate-type substrates. Two CDN molecules bind within the hSLC19A1 cavity as a compact dual-molecule unit, whereas folate and antifolate bind as a monomer and occupy a distinct pocket of the cavity. Moreover, the structures enable accurate mapping and potential mechanistic interpretation of hSLC19A1 with loss-of-activity and disease-related mutations. Our research provides a framework for understanding the mechanism of SLC19-family transporters and is a foundation for the development of potential therapeutics.
History
DepositionAug 24, 2022-
Header (metadata) releaseOct 5, 2022-
Map releaseOct 5, 2022-
UpdateJul 3, 2024-
Current statusJul 3, 2024Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_34176.png

Downloads & links

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Map

FileDownload / File: emd_34176.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.)
1 Å/pix.
x 320 pix.
= 320. Å		1 Å/pix.
x 320 pix.
= 320. Å		1 Å/pix.
x 320 pix.
= 320. Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.0375
Minimum - Maximum-0.1360295 - 0.23161061
Average (Standard dev.)0.000032740754 (±0.0047912668)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 320.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_34176_half_map_1.map
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Half map: #2

Fileemd_34176_half_map_2.map
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Sample components

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Entire : SLC19A1+5-MTHF

EntireName: SLC19A1+5-MTHF
Components
  • Complex: SLC19A1+5-MTHF
    • Protein or peptide: Reduced folate transporter
  • Ligand: N-[4-({[(6S)-2-AMINO-4-HYDROXY-5-METHYL-5,6,7,8-TETRAHYDROPTERIDIN-6-YL]METHYL}AMINO)BENZOYL]-L-GLUTAMIC ACID

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Supramolecule #1: SLC19A1+5-MTHF

SupramoleculeName: SLC19A1+5-MTHF / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Reduced folate transporter

MacromoleculeName: Reduced folate transporter / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 60.556082 KDa
Recombinant expressionOrganism: Spodoptera frugiperda (fall armyworm)
SequenceString: MGSMVPSSPA VEKQVPVEPG PDPELRSWRH LVCYLCFYGF MAQIRPGESF ITPYLLGPDK NFTREQVTNE ITPVLSYSYL AVLVPVFLL TDYLRYTPVL LLQGLSFVSV WLLLLLGHSV AHMQLMELFY SVTMAARIAY SSYIFSLVRP ARYQRVAGYS R AAVLLGVF ...String:
MGSMVPSSPA VEKQVPVEPG PDPELRSWRH LVCYLCFYGF MAQIRPGESF ITPYLLGPDK NFTREQVTNE ITPVLSYSYL AVLVPVFLL TDYLRYTPVL LLQGLSFVSV WLLLLLGHSV AHMQLMELFY SVTMAARIAY SSYIFSLVRP ARYQRVAGYS R AAVLLGVF TSSVLGQLLV TVGRVSFSTL NYISLAFLTF SVVLALFLKR PKRSLFFNRD DRGRCETSAS ELERMNPGPG GK LGHALRV ACGDSVLARM LRELGDSLRR PQLRLWSLWW VFNSAGYYLV VYYVHILWNE VDPTTNSARV YNGAADAAST LLG AITSFA AGFVKIRWAR WSKLLIAGVT ATQAGLVFLL AHTRHPSSIW LCYAAFVLFR GSYQFLVPIA TFQIASSLSK ELCA LVFGV NTFFATIVKT IITFIVSDVR GLGLPVRKQF QLYSVYFLIL SIIYFLGAML DGLRHCQRGH HPRQPPAQGL RSAAE EKAA QALSVQDKGL GGLQPAQSPP LSPEDKLGSE NLYLEVLFQG PFQGGSGGSG HHHHHHHHHH

UniProtKB: Reduced folate transporter

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Macromolecule #2: N-[4-({[(6S)-2-AMINO-4-HYDROXY-5-METHYL-5,6,7,8-TETRAHYDROPTERIDI...

MacromoleculeName: N-[4-({[(6S)-2-AMINO-4-HYDROXY-5-METHYL-5,6,7,8-TETRAHYDROPTERIDIN-6-YL]METHYL}AMINO)BENZOYL]-L-GLUTAMIC ACID
type: ligand / ID: 2 / Number of copies: 1 / Formula: THH
Molecular weightTheoretical: 459.456 Da
Chemical component information

ChemComp-THH:
N-[4-({[(6S)-2-AMINO-4-HYDROXY-5-METHYL-5,6,7,8-TETRAHYDROPTERIDIN-6-YL]METHYL}AMINO)BENZOYL]-L-GLUTAMIC ACID

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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

BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Image recordingFilm or detector model: GATAN K2 QUANTUM (4k x 4k) / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.5 µm / Nominal defocus min: 0.8 µm
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.0 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 182748
Initial angle assignmentType: PROJECTION MATCHING
Final angle assignmentType: PROJECTION MATCHING

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