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- EMDB-32828: Inhibited EP-complete -

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Basic information

Entry
Database: EMDB / ID: EMD-32828
TitleInhibited EP-complete
Map data
Sample
  • Complex: Enteropeptidase
Function / homology
Function and homology information


enteropeptidase / scavenger receptor activity / brush border / serine-type endopeptidase activity / proteolysis / membrane
Similarity search - Function
Peptidase S1A, enteropeptidase / Scavenger receptor cysteine-rich domain / SRCR domain / SRCR domain profile. / Domain found in sea urchin sperm protein, enterokinase, agrin / SRCR-like domain / SRCR-like domain superfamily / Scavenger receptor Cys-rich / MAM domain signature. / SEA domain superfamily ...Peptidase S1A, enteropeptidase / Scavenger receptor cysteine-rich domain / SRCR domain / SRCR domain profile. / Domain found in sea urchin sperm protein, enterokinase, agrin / SRCR-like domain / SRCR-like domain superfamily / Scavenger receptor Cys-rich / MAM domain signature. / SEA domain superfamily / Domain in meprin, A5, receptor protein tyrosine phosphatase mu (and others) / SEA domain profile. / SEA domain / SEA domain / MAM domain, meprin/A5/mu / MAM domain / MAM domain profile. / CUB domain / Domain first found in C1r, C1s, uEGF, and bone morphogenetic protein. / CUB domain / CUB domain profile. / Spermadhesin, CUB domain superfamily / Low-density lipoprotein (LDL) receptor class A, conserved site / LDL-receptor class A (LDLRA) domain signature. / Low-density lipoprotein receptor domain class A / LDL-receptor class A (LDLRA) domain profile. / Low-density lipoprotein receptor domain class A / Low-density lipoprotein (LDL) receptor class A repeat / LDL receptor-like superfamily / Serine proteases, trypsin family, histidine active site / Serine proteases, trypsin family, serine active site / Peptidase S1A, chymotrypsin family / Serine proteases, trypsin family, histidine active site. / Serine proteases, trypsin domain profile. / Trypsin-like serine protease / Serine proteases, trypsin family, serine active site. / Serine proteases, trypsin domain / Concanavalin A-like lectin/glucanase domain superfamily / Trypsin / Peptidase S1, PA clan, chymotrypsin-like fold / Peptidase S1, PA clan
Similarity search - Domain/homology
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.7 Å
AuthorsYang XL / Ding ZY / Huang HJ
Funding support1 items
OrganizationGrant numberCountry
Not funded
CitationJournal: Nat Commun / Year: 2022
Title: Cryo-EM structures reveal the activation and substrate recognition mechanism of human enteropeptidase.
Authors: Xiaoli Yang / Zhanyu Ding / Lisi Peng / Qiuyue Song / Deyu Zhang / Fang Cui / Chuanchao Xia / Keliang Li / Hua Yin / Shiyu Li / Zhaoshen Li / Haojie Huang /
Abstract: Enteropeptidase (EP) initiates intestinal digestion by proteolytically processing trypsinogen, generating catalytically active trypsin. EP dysfunction causes a series of pancreatic diseases including ...Enteropeptidase (EP) initiates intestinal digestion by proteolytically processing trypsinogen, generating catalytically active trypsin. EP dysfunction causes a series of pancreatic diseases including acute necrotizing pancreatitis. However, the molecular mechanisms of EP activation and substrate recognition remain elusive, due to the lack of structural information on the EP heavy chain. Here, we report cryo-EM structures of human EP in inactive, active, and substrate-bound states at resolutions from 2.7 to 4.9 Å. The EP heavy chain was observed to clamp the light chain with CUB2 domain for substrate recognition. The EP light chain N-terminus induced a rearrangement of surface-loops from inactive to active conformations, resulting in activated EP. The heavy chain then served as a hinge for light-chain conformational changes to recruit and subsequently cleave substrate. Our study provides structural insights into rearrangements of EP surface-loops and heavy chain dynamics in the EP catalytic cycle, advancing our understanding of EP-associated pancreatitis.
History
DepositionFeb 8, 2022-
Header (metadata) releaseNov 23, 2022-
Map releaseNov 23, 2022-
UpdateNov 30, 2022-
Current statusNov 30, 2022Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

Downloads & links

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Map

FileDownload / File: emd_32828.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.)
1.05 Å/pix.
x 256 pix.
= 267.776 Å
1.05 Å/pix.
x 256 pix.
= 267.776 Å
1.05 Å/pix.
x 256 pix.
= 267.776 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.046 Å
Density
Contour LevelBy AUTHOR: 0.111
Minimum - Maximum-0.0017032416 - 1.7457111
Average (Standard dev.)0.00090964034 (±0.020075237)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 267.776 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : Enteropeptidase

EntireName: Enteropeptidase
Components
  • Complex: Enteropeptidase

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Supramolecule #1: Enteropeptidase

SupramoleculeName: Enteropeptidase / type: complex / Chimera: Yes / ID: 1 / Parent: 0
Source (natural)Organism: Homo sapiens (human)

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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: 7.6
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 3.4 µm / Nominal defocus min: 0.7000000000000001 µm
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 52.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Initial angle assignmentType: PROJECTION MATCHING
Final angle assignmentType: ANGULAR RECONSTITUTION
Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.7 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 119676

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