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- PDB-8jzx: SLC15A4 inhibitor complex -

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Basic information

Entry
Database: PDB / ID: 8jzx
TitleSLC15A4 inhibitor complex
ComponentsSLC15A4-ALFA tag-SLC15A4-twin strep tag fusion protein
KeywordsPROTEIN TRANSPORT/INHIBITOR / endolysosomal transporter / PROTEIN TRANSPORT-INHIBITOR COMPLEX
Function / homology
Function and homology information


histidine transport / mast cell homeostasis / L-histidine transmembrane export from vacuole / L-histidine transmembrane transporter activity / peptidoglycan transmembrane transporter activity / Proton/oligopeptide cotransporters / regulation of isotype switching to IgG isotypes / positive regulation of toll-like receptor 8 signaling pathway / peptidoglycan transport / positive regulation of toll-like receptor 7 signaling pathway ...histidine transport / mast cell homeostasis / L-histidine transmembrane export from vacuole / L-histidine transmembrane transporter activity / peptidoglycan transmembrane transporter activity / Proton/oligopeptide cotransporters / regulation of isotype switching to IgG isotypes / positive regulation of toll-like receptor 8 signaling pathway / peptidoglycan transport / positive regulation of toll-like receptor 7 signaling pathway / SLC15A4:TASL-dependent IRF5 activation / positive regulation of nucleotide-binding oligomerization domain containing 1 signaling pathway / dipeptide import across plasma membrane / peptide:proton symporter activity / positive regulation of toll-like receptor 9 signaling pathway / dipeptide transmembrane transporter activity / regulation of nucleotide-binding domain, leucine rich repeat containing receptor signaling pathway / positive regulation of nucleotide-binding oligomerization domain containing 2 signaling pathway / endolysosome membrane / positive regulation of innate immune response / specific granule membrane / monoatomic ion transport / protein transport / early endosome membrane / lysosomal membrane / innate immune response / Neutrophil degranulation / membrane / plasma membrane
Similarity search - Function
PTR2 family proton/oligopeptide symporters signature 2. / PTR2 family proton/oligopeptide symporter, conserved site / Proton-dependent oligopeptide transporter family / POT family / MFS transporter superfamily
Similarity search - Domain/homology
CHOLESTEROL / Chem-Q09 / Solute carrier family 15 member 4
Similarity search - Component
Biological speciesHomo sapiens (human)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.5 Å
AuthorsZhang, S.S. / Chen, X.D. / Xie, M.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)21532004, 31570733 China
CitationJournal: Nat Commun / Year: 2023
Title: A conformation-locking inhibitor of SLC15A4 with TASL proteostatic anti-inflammatory activity.
Authors: Andras Boeszoermenyi / Léa Bernaleau / Xudong Chen / Felix Kartnig / Min Xie / Haobo Zhang / Sensen Zhang / Maeva Delacrétaz / Anna Koren / Ann-Katrin Hopp / Vojtech Dvorak / Stefan ...Authors: Andras Boeszoermenyi / Léa Bernaleau / Xudong Chen / Felix Kartnig / Min Xie / Haobo Zhang / Sensen Zhang / Maeva Delacrétaz / Anna Koren / Ann-Katrin Hopp / Vojtech Dvorak / Stefan Kubicek / Daniel Aletaha / Maojun Yang / Manuele Rebsamen / Leonhard X Heinz / Giulio Superti-Furga /
Abstract: Dysregulation of pathogen-recognition pathways of the innate immune system is associated with multiple autoimmune disorders. Due to the intricacies of the molecular network involved, the ...Dysregulation of pathogen-recognition pathways of the innate immune system is associated with multiple autoimmune disorders. Due to the intricacies of the molecular network involved, the identification of pathway- and disease-specific therapeutics has been challenging. Using a phenotypic assay monitoring the degradation of the immune adapter TASL, we identify feeblin, a chemical entity which inhibits the nucleic acid-sensing TLR7/8 pathway activating IRF5 by disrupting the SLC15A4-TASL adapter module. A high-resolution cryo-EM structure of feeblin with SLC15A4 reveals that the inhibitor binds a lysosomal outward-open conformation incompatible with TASL binding on the cytoplasmic side, leading to degradation of TASL. This mechanism of action exploits a conformational switch and converts a target-binding event into proteostatic regulation of the effector protein TASL, interrupting the TLR7/8-IRF5 signaling pathway and preventing downstream proinflammatory responses. Considering that all components involved have been genetically associated with systemic lupus erythematosus and that feeblin blocks responses in disease-relevant human immune cells from patients, the study represents a proof-of-concept for the development of therapeutics against this disease.
History
DepositionJul 6, 2023Deposition site: PDBJ / Processing site: PDBJ
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Revision 1.1Nov 15, 2023Group: Database references / Category: citation / citation_author
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Revision 2.1Nov 20, 2024Group: Data collection / Structure summary
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: SLC15A4-ALFA tag-SLC15A4-twin strep tag fusion protein
B: SLC15A4-ALFA tag-SLC15A4-twin strep tag fusion protein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)127,40110
Polymers124,5482
Non-polymers2,8528
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein SLC15A4-ALFA tag-SLC15A4-twin strep tag fusion protein


Mass: 62274.246 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Details: SLC15A4 (1-252 residues) + ALFA tag (SRLEEELRRRLTE) + SLC15A4(304-577 resides)+ twin-strep tag sequence
Source: (gene. exp.) Homo sapiens (human), (gene. exp.) synthetic construct (others)
Gene: SLC15A4 / Cell line (production host): HEK293 / Production host: Homo sapiens (human) / References: UniProt: Q8N697
#2: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
#3: Chemical
ChemComp-CLR / CHOLESTEROL


Mass: 386.654 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C27H46O
#4: Chemical ChemComp-Q09 / 2-(4-ethoxyphenyl)-N-[3-[(2R)-2-methylpiperidin-1-yl]propyl]quinoline-4-carboxamide


Mass: 431.570 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C27H33N3O2 / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: endolysosomal transporter / Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.2
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 12000 / Symmetry type: POINT

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