5Y2D

Crystal structure of H. pylori HtrA

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.70 Å
  • R-Value Free: 0.334 
  • R-Value Work: 0.331 
  • R-Value Observed: 0.332 

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This is version 1.1 of the entry. See complete history. 


Literature

The unique trimeric assembly of the virulence factor HtrA fromHelicobacter pylorioccurs via N-terminal domain swapping.

Zhang, Z., Huang, Q., Tao, X., Song, G., Zheng, P., Li, H., Sun, H., Xia, W.

(2019) J Biol Chem 294: 7990-8000

  • DOI: 10.1074/jbc.RA119.007387
  • Primary Citation of Related Structures:  
    5Y2D, 5Y28

  • PubMed Abstract: 

    • Knowledge of the molecular mechanisms of specific bacterial virulence factors can significantly contribute to antibacterial drug discovery. Helicobacter pylori is a Gram-negative microaerophilic bacterium that infects almost half of the worl ...

    Knowledge of the molecular mechanisms of specific bacterial virulence factors can significantly contribute to antibacterial drug discovery. Helicobacter pylori is a Gram-negative microaerophilic bacterium that infects almost half of the world's population, leading to gastric disorders and even gastric cancer. H. pylori expresses a series of virulence factors in the host, among which high-temperature requirement A ( Hp HtrA) is a newly identified serine protease secreted by H. pylori. Hp HtrA cleaves the extracellular domain of the epithelial cell surface adhesion protein E-cadherin and disrupts gastric epithelial cell junctions, allowing H. pylori to access the intercellular space. Here we report the first crystal structure of Hp HtrA at 3.0 Å resolution. The structure revealed a new type of HtrA protease trimer stabilized by unique N-terminal domain swapping distinct from other known HtrA homologs. We further observed that truncation of the N terminus completely abrogates Hp HtrA trimer formation as well as protease activity. In the presence of unfolded substrate, Hp HtrA assembled into cage-like 12-mers or 24-mers. Combining crystallographic, biochemical, and mutagenic data, we propose a mechanistic model of how Hp HtrA recognizes and cleaves the well-folded E-cadherin substrate. Our study provides a fundamental basis for the development of anti- H. pylori agents by using a previously uncharacterized HtrA protease as a target.

    Organizational Affiliation: 

    From the MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, China, xiawei5@mail.sysu.edu.cn.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Periplasmic serine endoprotease DegP-likeA465Helicobacter pylori 26695Mutation(s): 0 
Gene Names: hp1018/19
EC: 3.4.21.107
Find proteins for G2J5T2 (Helicobacter pylori (strain ATCC 700392 / 26695))
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Go to UniProtKB:  G2J5T2
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
UNK-UNK-K-UNK-UNK-UNK-UNK-UNK-UNK-UNKD10Helicobacter pylori 26695Mutation(s): 0 
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
UNK-UNK-UNKB3Helicobacter pylori 26695Mutation(s): 0 
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
UNK-UNK-UNK-UNK-UNKC5Helicobacter pylori 26695Mutation(s): 0 
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
UNK-UNK-UNK-UNK-UNK-UNK-UNK-UNKE8Helicobacter pylori 26695Mutation(s): 0 
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
UNK-UNK-UNK-UNK-UNK-UNK-UNK-UNK-UNK-UNK-UNKF11Helicobacter pylori 26695Mutation(s): 0 
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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.70 Å
  • R-Value Free: 0.334 
  • R-Value Work: 0.331 
  • R-Value Observed: 0.332 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 128.88α = 90
b = 128.88β = 90
c = 184.536γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data collection
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-3000data reduction
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2018-08-15
    Type: Initial release
  • Version 1.1: 2019-08-28
    Changes: Data collection, Database references