1ELF

NATURE OF THE INACTIVATION OF ELASTASE BY N-PEPTIDYL-O-AROYL HYDROXYLAMINE AS A FUNCTION OF PH

• PDB DOI: https://doi.org/10.2210/pdb1ELF/pdb

• Classification: COMPLEX (HYDROLASE/INHIBITOR)
• Organism(s): Sus scrofa
• Mutation(s): No 


• Deposited: 1995-03-13 Released: 1995-07-10 
• Deposition Author(s): Ding, X., Rasmussen, B., Demuth, H.-U., Ringe, D., Steinmetz, A.C.U.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Work: 
  0.180 (Depositor) 
• R-Value Observed: 
  0.180 (Depositor) 

Literature

Nature of the inactivation of elastase by N-peptidyl-O-aroyl hydroxylamine as a function of pH.

Ding, X., Rasmussen, B.F., Demuth, H.U., Ringe, D., Steinmetz, A.C.

(1995) Biochemistry 34: 7749-7756

• PubMed: 7779821 
• Primary Citation of Related Structures:  
  1ELF, 1ELG


• PubMed Abstract: 
  

  The mechanism of inactivation of porcine pancreatic elastase (PPE) by N-peptidyl-O-aroylhydroxylamine was studied by X-ray crystallography. The inactivator forms a stable complex with the enzyme by means of a covalent attachment to the active site Ser 203(195) O gamma. The nature of the complex is, however, different depending on the pH at which the inactivation reaction occurs. At pH 5, the complex formed is a hydroxylamine derivative of Ser 203(195) in which the O gamma of serine is the oxygen of the hydroxylamine derivative. At pH 7.5, the complex formed is a carbamate derivative at Ser 203(195) O gamma. In both types of complexes, the inactivator binds in the S' subsites of the enzyme instead of forming the usual antiparallel beta-sheet with the S subsites. The implication for the mechanism of inactivation at different pHs is discussed.

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Organizational Affiliation: 

Department of Chemistry, Brandeis University, Waltham, Massachusetts 02254, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 26.42 kDa 
• Atom Count: 2,011 
• Modelled Residue Count: 240 
• Deposited Residue Count: 240 
• Unique protein chains: 1

Macromolecules

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

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
BAF	E [auth A]	(TERT-BUTYLOXYCARBONYL)-ALANYL-AMINO ETHYL-FORMAMIDE C11 H21 N3 O4 MNUWNIQGBRBQRE-YUMQZZPRSA-N
SO4	C [auth A], D [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
CA	B [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Work:  0.180 (Depositor) 
• R-Value Observed: 0.180 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 52.27	α = 90
b = 58.09	β = 90
c = 75.33	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1995-07-10 
Deposition Author(s): Ding, X., Rasmussen, B., Demuth, H.-U., Ringe, D., Steinmetz, A.C.U.

Revision History  

• Version 1.0: 1995-07-10
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-06-05
  Changes: Data collection, Database references, Derived calculations, Other
• Version 1.4: 2024-12-25
  Changes: Advisory, Derived calculations, Structure summary