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- EMDB-63722: Cryo-EM structure of human SIDT1 -

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Basic information

Entry
Database: EMDB / ID: EMD-63722
TitleCryo-EM structure of human SIDT1
Map data
Sample
  • Cell: Dimer of SID1 transmembrane family member 1(SIDT1)
    • Protein or peptide: Isoform 2 of SID1 transmembrane family member 1
KeywordsDimer / Transport / MEMBRANE PROTEIN
Function / homologyRNA transmembrane transporter activity / SID1 transmembrane family / dsRNA-gated channel SID-1 / RNA transport / cholesterol binding / double-stranded RNA binding / lysosome / plasma membrane / SID1 transmembrane family member 1
Function and homology information
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.79 Å
AuthorsLiao L / Sun L
Funding support China, 1 items
OrganizationGrant numberCountry
Chinese Academy of Sciences China
CitationJournal: To Be Published
Title: SIDT1 is a calcium-associated CD8+ T cell suppressor and target for cancer immunotherapy
Authors: Hu T / Han Z / Liao L / Zeng Y / Ma H / Huang J / Chen Y / Ye J / Zhou T / Zhang W / Cang C / Sun L / Pan W / Wang J / Zhu S
History
DepositionMar 12, 2025-
Header (metadata) releaseMar 18, 2026-
Map releaseMar 18, 2026-
UpdateMar 18, 2026-
Current statusMar 18, 2026Processing site: PDBc / Status: Released

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Structure visualization

Supplemental images

emd_63722.png

Downloads & links

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Map

FileDownload / File: emd_63722.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.1 Å/pix.
x 256 pix.
= 281.6 Å		1.1 Å/pix.
x 256 pix.
= 281.6 Å		1.1 Å/pix.
x 256 pix.
= 281.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.1 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.4
Minimum - Maximum-1.7166818 - 2.898562
Average (Standard dev.)0.0028478047 (±0.06560935)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 281.6 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_63722_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_63722_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Dimer of SID1 transmembrane family member 1(SIDT1)

EntireName: Dimer of SID1 transmembrane family member 1(SIDT1)
Components
  • Cell: Dimer of SID1 transmembrane family member 1(SIDT1)
    • Protein or peptide: Isoform 2 of SID1 transmembrane family member 1

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Supramolecule #1: Dimer of SID1 transmembrane family member 1(SIDT1)

SupramoleculeName: Dimer of SID1 transmembrane family member 1(SIDT1) / type: cell / ID: 1 / Parent: 0 / Macromolecule list: all / Details: membrand protein with detergent LMNG
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Isoform 2 of SID1 transmembrane family member 1

MacromoleculeName: Isoform 2 of SID1 transmembrane family member 1 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 94.440742 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MRGCLRLALL CALPWLLLAA SPGHPAKSPR QPPAPRRDPF DAARGADFDH VYSGVVNLST ENIYSFNYTS QPDQVTAVRV YVNSSSENL NYPVLVVVRQ QKEVLSWQVP LLFQGLYQRS YNYQEVSRTL CPSEATNETG PLQQLIFVDV ASMAPLGAQY K LLVTKLKH ...String:
MRGCLRLALL CALPWLLLAA SPGHPAKSPR QPPAPRRDPF DAARGADFDH VYSGVVNLST ENIYSFNYTS QPDQVTAVRV YVNSSSENL NYPVLVVVRQ QKEVLSWQVP LLFQGLYQRS YNYQEVSRTL CPSEATNETG PLQQLIFVDV ASMAPLGAQY K LLVTKLKH FQLRTNVAFH FTASPSQPQY FLYKFPKDVD SVIIKVVSEM AYPCSVVSVQ NIMCPVYDLD HNVEFNGVYQ SM TKKAAIT LQKKDFPGEQ FFVVFVIKPE DYACGGSFFI QEKENQTWNL QRKKNLEVTI VPSIKESVYV KSSLFSVFIF LSF YLGCLL VGFVHYLRFQ RKSIDGSFGS NDGSGNMVAS HPIAASTPEG SNYGTIDESS SSPGRQMSSS DGGPPGQSDT DSSV EESDF DTMPDIESDK NIIRTKMFLY LSDLSRKDRR IVSKKYKIYF WNIITIAVFY ALPVIQLVIT YQTVVNVTGN QDICY YNFL CAHPLGVLSA FNNILSNLGH VLLGFLFLLI VLRRDILHRR ALEAKDIFAV EYGIPKHFGL FYAMGIALMM EGVLSA CYH VCPNYSNFQF DTSFMYMIAG LCMLKLYQTR HPDINASAYS AYASFAVVIM VTVLGVVFGK NDVWFWVIFS AIHVLAS LA LSTQIYYMGR FKIDVSDTDL GIFRRAAMVF YTDCIQQCSR PLYMDRMVLL VVGNLVNWSF ALFGLIYRPR DFASYMLG I FICNLLLYLA FYIIMKLRSS EKVLPVPLFC IVATAVMWAA ALYFFFQNLS SWEGTPAESR EKNRECILLD FFDDHDIWH FLSATALFFS FLVLLTLDDD LDVVRRDQIP VF

UniProtKB: SID1 transmembrane family member 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

Concentration5 mg/mL
BufferpH: 7.4
GridModel: Quantifoil R1.2/1.3 / Material: GOLD / Mesh: 300
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 281 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: OTHER / Imaging mode: OTHER / Nominal defocus max: 2.3000000000000003 µm / Nominal defocus min: 1.5 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER / Details: AlphaFold Predicted model
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.79 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 39127
Initial angle assignmentType: OTHER
Final angle assignmentType: OTHER

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