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- EMDB-32452: Structure of a human glycosylphosphatidylinositol (GPI) transamid... -

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Basic information

Entry
Database: EMDB / ID: EMD-32452
TitleStructure of a human glycosylphosphatidylinositol (GPI) transamidase-RNF121 complex
Map data
Sample
  • Complex: Human glycosylphosphatidylinositol transamidase
Function / homology
Function and homology information


GPI-anchor transamidase activity / attachment of GPI anchor to protein / GPI-anchor transamidase complex / GPI anchor biosynthetic process / protein retention in ER lumen / Attachment of GPI anchor to uPAR / Hydrolases / regulation of receptor signaling pathway via JAK-STAT / protein disulfide isomerase activity / neuron differentiation ...GPI-anchor transamidase activity / attachment of GPI anchor to protein / GPI-anchor transamidase complex / GPI anchor biosynthetic process / protein retention in ER lumen / Attachment of GPI anchor to uPAR / Hydrolases / regulation of receptor signaling pathway via JAK-STAT / protein disulfide isomerase activity / neuron differentiation / cytoplasmic vesicle / neuron apoptotic process / centrosome / endoplasmic reticulum membrane / endoplasmic reticulum / mitochondrion / proteolysis / membrane / plasma membrane / cytosol
Similarity search - Function
GPI transamidase component PIG-T / GPI transamidase component Gaa1 / GPI transamidase subunit PIG-U / Phosphatidylinositol-glycan biosynthesis class S protein / GPI-anchor transamidase / Gpi16 subunit, GPI transamidase component / Gaa1-like, GPI transamidase component / GPI transamidase subunit PIG-U / Phosphatidylinositol-glycan biosynthesis class S protein / Peptidase C13, legumain / Peptidase C13 family
Similarity search - Domain/homology
Glycosylphosphatidylinositol anchor attachment 1 protein / GPI-anchor transamidase / GPI transamidase component PIG-T / GPI transamidase component PIG-S / Phosphatidylinositol glycan anchor biosynthesis class U protein
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsZhang H / Su J / Li B / Gao Y / Zhang XC / Zhao Y
Funding support China, 2 items
OrganizationGrant numberCountry
Chinese Academy of SciencesXDB37030304 China
Chinese Academy of SciencesXDB37030301 China
CitationJournal: Nat Struct Mol Biol / Year: 2022
Title: Structure of human glycosylphosphatidylinositol transamidase.
Authors: Hongwei Zhang / Jiawei Su / Bin Li / Yiwei Gao / Mengran Liu / Lingli He / Hao Xu / Yanli Dong / Xuejun Cai Zhang / Yan Zhao /
Abstract: Glycosylphosphatidylinositol (GPI) molecules are complex glycophospholipids and serve as membrane anchors for tethering many proteins to the cell surface. Attaching GPI to the protein in the ...Glycosylphosphatidylinositol (GPI) molecules are complex glycophospholipids and serve as membrane anchors for tethering many proteins to the cell surface. Attaching GPI to the protein in the endoplasmic reticulum (ER) is catalyzed by the transmembrane GPI transamidase (GPIT) complex, which is essential for maturation of the GPI-anchored proteins. The GPIT complex is known to be composed of five subunits: PIGK, PIGU, PIGT, PIGS and GPAA1. Here, we determined the structure of the human GPIT complex at a resolution of 3.1 Å using single-particle cryo-EM, elucidating its overall assembly. The PIGK subunit functions as the catalytic component, in which we identified a C206-H164-N58 triad that is critical for the transamination reaction. Transmembrane helices constitute a widely opened cleft, which is located underneath PIGK, serving as a GPI substrate-binding site. The ubiquitin E3 ligase RNF121 is visualized at the back of the complex and probably serves as a quality control factor for the GPIT complex.
History
DepositionDec 23, 2021-
Header (metadata) releaseFeb 16, 2022-
Map releaseFeb 16, 2022-
UpdateMar 30, 2022-
Current statusMar 30, 2022Processing site: PDBj / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.52
  • Imaged by UCSF Chimera
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  • Surface view colored by height
  • Surface level: 0.52
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_32452.png

Downloads & links

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Map

FileDownload / File: emd_32452.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.07 Å/pix.
x 320 pix.
= 342.4 Å		1.07 Å/pix.
x 320 pix.
= 342.4 Å		1.07 Å/pix.
x 320 pix.
= 342.4 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.07 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.52 / Movie #1: 0.52
Minimum - Maximum-1.1835661 - 3.117552
Average (Standard dev.)0.0016257924 (±0.08191014)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 342.40002 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.071.071.07
M x/y/z320320320
origin x/y/z0.0000.0000.000
length x/y/z342.400342.400342.400
α/β/γ90.00090.00090.000
start NX/NY/NZ-64-64-64
NX/NY/NZ128128128
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS320320320
D min/max/mean-1.1843.1180.002

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Supplemental data

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Sample components

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Entire : Human glycosylphosphatidylinositol transamidase

EntireName: Human glycosylphosphatidylinositol transamidase
Components
  • Complex: Human glycosylphosphatidylinositol transamidase

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Supramolecule #1: Human glycosylphosphatidylinositol transamidase

SupramoleculeName: Human glycosylphosphatidylinositol transamidase / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#5
Source (natural)Organism: Homo sapiens (human)
Recombinant expressionOrganism: Homo sapiens (human) / Recombinant cell: HEK293

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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 TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k 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: 22.0 µm / Nominal defocus min: 12.0 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 53244
Initial angle assignmentType: PROJECTION MATCHING
Final angle assignmentType: ANGULAR RECONSTITUTION

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