1EAI

COMPLEX OF ASCARIS CHYMOTRPSIN/ELASTASE INHIBITOR WITH PORCINE ELASTASE

• PDB DOI: https://doi.org/10.2210/pdb1EAI/pdb

• Classification: SERINE PROTEINASE
• Organism(s): Sus scrofa, Ascaris suum
• Mutation(s): No 


• Deposited: 1999-03-25 Released: 1999-04-05 
• Deposition Author(s): Huang, K., Strynadka, N.C.J., Bernard, V.D., Peanasky, R.J., James, M.N.G.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å

Literature

The molecular structure of the complex of Ascaris chymotrypsin/elastase inhibitor with porcine elastase.

Huang, K., Strynadka, N.C., Bernard, V.D., Peanasky, R.J., James, M.N.

(1994) Structure 2: 679-689

• PubMed: 7922044 
• DOI: https://doi.org/10.1016/s0969-2126(00)00068-x
• Primary Citation of Related Structures:  
  1EAI


• PubMed Abstract: 
  

  The intestinal parasitic worm, Ascaris suum, produces a variety of protein inhibitors that defend the organism against the host's proteinases. Eight different proteins from Ascaris suum have been identified as inhibitors of serine proteinases, targeting chymotrypsin, elastase and trypsin. These inhibitors share 30-40% sequence identity with one another, but have virtually no sequence identity with members of any of the other families of serine proteinase inhibitors.

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Organizational Affiliation: 

Department of Biochemistry, University of Alberta, Edmonton, Canada.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Hetero 4-mer - A2B2 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 2 generated by PISA,PQS (software)

Biological Assembly 3  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 3 generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 65.06 kDa 
• Atom Count: 4,686 
• Modelled Residue Count: 602 
• Deposited Residue Count: 602 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (ELASTASE)	A, B	240	Sus scrofa	Mutation(s): 0  EC: 3.4.21.36
UniProt
Find proteins for P00772 (Sus scrofa) Explore P00772  Go to UniProtKB:  P00772

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (CHYMOTRYPSIN/ELASTASE ISOINHIBITOR 1)	C, D	61	Ascaris suum	Mutation(s): 0
UniProt
Find proteins for P07851 (Ascaris suum) Explore P07851  Go to UniProtKB:  P07851

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 84.02	α = 90
b = 84.02	β = 90
c = 190.93	γ = 120

Software Package:

Software Name	Purpose
X-GEN	data scaling
X-GEN	data reduction
AMoRE	phasing
TNT	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 1999-04-05 
Deposition Author(s): Huang, K., Strynadka, N.C.J., Bernard, V.D., Peanasky, R.J., James, M.N.G.

Revision History  

• Version 1.0: 1999-04-05
  Type: Initial release
  
• Version 1.1: 2007-10-16
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance
• Version 1.3: 2017-10-04
  Changes: Refinement description
• Version 1.4: 2023-08-09
  Changes: Data collection, Database references, Refinement description