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- EMDB-28214: Cryo-EM structure of human PRDX4 -

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Basic information

Entry
Database: EMDB / ID: EMD-28214
TitleCryo-EM structure of human PRDX4
Map dataCryo-EM structure of human PRDX4
Sample
  • Complex: H6PD
    • Protein or peptide: Peroxiredoxin-4
  • Ligand: water
KeywordsOXIDOREDUCTASE
Function / homology
Function and homology information


I-kappaB phosphorylation / negative regulation of male germ cell proliferation / thioredoxin-dependent peroxiredoxin / thioredoxin peroxidase activity / molecular sequestering activity / extracellular matrix organization / cell redox homeostasis / protein maturation / hydrogen peroxide catabolic process / male gonad development ...I-kappaB phosphorylation / negative regulation of male germ cell proliferation / thioredoxin-dependent peroxiredoxin / thioredoxin peroxidase activity / molecular sequestering activity / extracellular matrix organization / cell redox homeostasis / protein maturation / hydrogen peroxide catabolic process / male gonad development / response to oxidative stress / secretory granule lumen / spermatogenesis / molecular adaptor activity / ficolin-1-rich granule lumen / Neutrophil degranulation / endoplasmic reticulum / extracellular exosome / extracellular region / identical protein binding / nucleus / cytosol
Similarity search - Function
: / Peroxiredoxin, C-terminal / C-terminal domain of 1-Cys peroxiredoxin / Alkyl hydroperoxide reductase subunit C/ Thiol specific antioxidant / AhpC/TSA family / Thioredoxin domain profile. / Thioredoxin domain / Thioredoxin-like superfamily
Similarity search - Domain/homology
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.83 Å
AuthorsSu CC / Lyu M
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID) United States
CitationJournal: Cell Rep / Year: 2023
Title: High-resolution structural-omics of human liver enzymes.
Authors: Chih-Chia Su / Meinan Lyu / Zhemin Zhang / Masaru Miyagi / Wei Huang / Derek J Taylor / Edward W Yu /
Abstract: We applied raw human liver microsome lysate to a holey carbon grid and used cryo-electron microscopy (cryo-EM) to define its composition. From this sample we identified and simultaneously determined ...We applied raw human liver microsome lysate to a holey carbon grid and used cryo-electron microscopy (cryo-EM) to define its composition. From this sample we identified and simultaneously determined high-resolution structural information for ten unique human liver enzymes involved in diverse cellular processes. Notably, we determined the structure of the endoplasmic bifunctional protein H6PD, where the N- and C-terminal domains independently possess glucose-6-phosphate dehydrogenase and 6-phosphogluconolactonase enzymatic activity, respectively. We also obtained the structure of heterodimeric human GANAB, an ER glycoprotein quality-control machinery that contains a catalytic α subunit and a noncatalytic β subunit. In addition, we observed a decameric peroxidase, PRDX4, which directly contacts a disulfide isomerase-related protein, ERp46. Structural data suggest that several glycosylations, bound endogenous compounds, and ions associate with these human liver enzymes. These results highlight the importance of cryo-EM in facilitating the elucidation of human organ proteomics at the atomic level.
History
DepositionSep 22, 2022-
Header (metadata) releaseMay 3, 2023-
Map releaseMay 3, 2023-
UpdateNov 15, 2023-
Current statusNov 15, 2023Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_28214.png

Downloads & links

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Map

FileDownload / File: emd_28214.map.gz / Format: CCP4 / Size: 103 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationCryo-EM structure of human PRDX4
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.08 Å/pix.
x 300 pix.
= 324. Å		1.08 Å/pix.
x 300 pix.
= 324. Å		1.08 Å/pix.
x 300 pix.
= 324. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.08 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.37
Minimum - Maximum-1.8224118 - 3.2470162
Average (Standard dev.)0.00005909519 (±0.07384141)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions300300300
Spacing300300300
CellA=B=C: 324.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_28214_msk_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Additional map: unsharpened map

Fileemd_28214_additional_1.map
Annotationunsharpened map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Cryo-EM structure of human PRDX4

Fileemd_28214_half_map_1.map
AnnotationCryo-EM structure of human PRDX4
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Cryo-EM structure of human PRDX4

Fileemd_28214_half_map_2.map
AnnotationCryo-EM structure of human PRDX4
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : H6PD

EntireName: H6PD
Components
  • Complex: H6PD
    • Protein or peptide: Peroxiredoxin-4
  • Ligand: water

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Supramolecule #1: H6PD

SupramoleculeName: H6PD / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Peroxiredoxin-4

MacromoleculeName: Peroxiredoxin-4 / type: protein_or_peptide / ID: 1 / Number of copies: 10 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 30.578873 KDa
SequenceString: MEALPLLAAT TPDHGRHRRL LLLPLLLFLL PAGAVQGWET EERPRTREEE CHFYAGGQVY PGEASRVSVA DHSLHLSKAK ISKPAPYWE GTAVIDGEFK ELKLTDYRGK YLVFFFYPLD FTFVCPTEII AFGDRLEEFR SINTEVVACS VDSQFTHLAW I NTPRRQGG ...String:
MEALPLLAAT TPDHGRHRRL LLLPLLLFLL PAGAVQGWET EERPRTREEE CHFYAGGQVY PGEASRVSVA DHSLHLSKAK ISKPAPYWE GTAVIDGEFK ELKLTDYRGK YLVFFFYPLD FTFVCPTEII AFGDRLEEFR SINTEVVACS VDSQFTHLAW I NTPRRQGG LGPIRIPLLS DLTHQISKDY GVYLEDSGHT LRGLFIIDDK GILRQITLND LPVGRSVDET LRLVQAFQYT DK HGEVCPA GWKPGSETII PDPAGKLKYF DKLN

UniProtKB: Peroxiredoxin-4

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Macromolecule #2: water

MacromoleculeName: water / type: ligand / ID: 2 / Number of copies: 402 / Formula: HOH
Molecular weightTheoretical: 18.015 Da
Chemical component information

ChemComp-HOH:
WATER

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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

Concentration0.5 mg/mL
BufferpH: 7.5
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV
DetailsThis is from a heterogeneous and impure protein sample.

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 29.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: INSILICO MODEL
Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.83 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 34192
Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementProtocol: AB INITIO MODEL
Output model

PDB-8ekw:
Cryo-EM structure of human PRDX4

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