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- PDB-8h3u: Inhibitor-bound EP, polyA model -

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Basic information

Entry
Database: PDB / ID: 8h3u
TitleInhibitor-bound EP, polyA model
Components
  • Enteropeptidase catalytic light chain
  • Enteropeptidase non-catalytic heavy chain
KeywordsMEMBRANE PROTEIN / complex
Function / homology
Function and homology information


enteropeptidase / brush border / serine-type endopeptidase activity / proteolysis / membrane
Similarity search - Function
Peptidase S1A, enteropeptidase / Scavenger receptor cysteine-rich domain / Domain found in sea urchin sperm protein, enterokinase, agrin / SRCR domain / SRCR domain profile. / 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 / Domain found in sea urchin sperm protein, enterokinase, agrin / SRCR domain / SRCR domain profile. / 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 receptor domain class A / Low-density lipoprotein (LDL) receptor class A, conserved site / LDL-receptor class A (LDLRA) domain signature. / 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. / Serine proteases, trypsin family, serine active site. / Trypsin-like serine protease / Serine proteases, trypsin domain / Trypsin / Concanavalin A-like lectin/glucanase domain superfamily / Peptidase S1, PA clan, chymotrypsin-like fold / Peptidase S1, PA clan
Similarity search - Domain/homology
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.7 Å
AuthorsDing, Z.Y. / Huang, H.J.
Funding support1items
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
DepositionOct 9, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Nov 23, 2022Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Enteropeptidase non-catalytic heavy chain
B: Enteropeptidase catalytic light chain


Theoretical massNumber of molelcules
Total (without water)92,9312
Polymers92,9312
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Antibody Enteropeptidase non-catalytic heavy chain


Mass: 66652.852 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: TMPRSS15, ENTK, PRSS7 / Production host: Homo sapiens (human) / References: UniProt: P98073
#2: Protein Enteropeptidase catalytic light chain


Mass: 26277.760 Da / Num. of mol.: 1 / Mutation: H825A,D876A,S971A
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: TMPRSS15, ENTK, PRSS7 / Production host: Homo sapiens (human) / References: UniProt: P98073

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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: inhibitor-bound EP, polyA model / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.6
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 FIELDBright-field microscopy / Nominal defocus max: 3500 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 52 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.17.1_3660: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 4.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 119676 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0016543
ELECTRON MICROSCOPYf_angle_d0.3758904
ELECTRON MICROSCOPYf_dihedral_angle_d7.7592340
ELECTRON MICROSCOPYf_chiral_restr0.04961
ELECTRON MICROSCOPYf_plane_restr0.0031179

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