1QGF

PORCINE PANCREATIC ELASTASE COMPLEXED WITH (3R, 4S)N-PARA-TOLUENESULPHONYL-3-ETHYL-4-(CARBOXYLIC ACID)PYRROLIDIN-2-ONE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.183 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Mechanistic insights into the inhibition of serine proteases by monocyclic lactams.

Wilmouth, R.C.Kassamally, S.Westwood, N.J.Sheppard, R.J.Claridge, T.D.Aplin, R.T.Wright, P.A.Pritchard, G.J.Schofield, C.J.

(1999) Biochemistry 38: 7989-7998

  • DOI: 10.1021/bi990098y
  • Also Cited By: 1E38, 1E37, 1E36, 1E35, 1E34

  • PubMed Abstract: 
  • Although originally discovered as inhibitors of pencillin-binding proteins, beta-lactams have more recently found utility as serine protease inhibitors. Indeed through their ability to react irreversibly with nucleophilic serine residues they have pr ...

    Although originally discovered as inhibitors of pencillin-binding proteins, beta-lactams have more recently found utility as serine protease inhibitors. Indeed through their ability to react irreversibly with nucleophilic serine residues they have proved extraordinarily successful as enzyme inhibitors. Consequently there has been much speculation as to the reason for the general effectiveness of beta-lactams as antibacterials or inhibitors of hydrolytic enzymes. The interaction of analogous beta- and gamma-lactams with a serine protease was investigated. Three series of gamma-lactams based upon monocyclic beta-lactam inhibitors of elastase [Firestone, R. A. et al. (1990) Tetrahedron 46, 2255-2262.] but with an extra methylene group inserted between three of the bonds in the ring were synthesized. Their interaction with porcine pancreatic elastase and their efficacy as inhibitors were evaluated through the use of kinetic, NMR, mass spectrometric, and X-ray crystallographic analyses. The first series, with the methylene group inserted between C-3 and C-4 of the beta-lactam template, were readily hydrolyzed but were inactive or very weakly active as inhibitors. The second series, with the methylene group between C-4 and the nitrogen of the beta-lactam template, were inhibitory and reacted reversibly with PPE to form acyl-enzyme complexes, which were stable with respect to hydrolysis. The third series, with the methylene group inserted between C-2 and C-3, were not hydrolyzed and were not inhibitors consistent with lack of binding to PPE. Comparison of the crystal structure of the acyl-enzyme complex formed between PPE and a second series gamma-lactam and that formed between PPE and a peptide [Wilmouth, R. C., et al. (1997) Nat. Struct. Biol. 4, 456-462.] reveals why the complexes formed with this series were resistant to hydrolysis and suggests ways in which stable acyl-enzyme complexes might be obtained from monocyclic gamma-lactam-based inhibitors.


    Related Citations: 
    • Structure of a Specific Acyl-Enzyme Complex Formed between Beta-Casomorphin-7 and Porcine Pancreatic Elastase
      Wilmouth, R.C.,Clifton, I.J.,Robinson, C.V.,Roach, P.L.,Aplin, R.T.,Westwood, N.J.,Hajdu, J.,Schofield, C.J.
      (1997) Nat.Struct.Mol.Biol. 4: 456
    • Structure of Native Porcine Pancreatic Elastase at 1.65 A Resolution
      Meyer, E.,Cole, G.,Radhakrishnan, R.,Epp, O.
      (1988) Acta Crystallogr.,Sect.B 44: 26
    • Inhibition of Elastase by N-Sulfonylaryl Beta-Lactams: Anatomy of a Stable Acyl-Enzyme Complex
      Wilmouth, R.C.,Westwood, N.J.,Anderson, K.,Brownlee, W.,Claridge, T.D.W.,Clifton, I.J.,Pritchard, G.J.,Aplin, R.T.,Schofield, C.J.
      (1998) Biochemistry 37: 17506


    Organizational Affiliation

    The Oxford Centre for Molecular Sciences, The Dyson Perrins Laboratory, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ELASTASE
A
240Sus scrofaMutation(s): 0 
Gene Names: CELA1 (ELA1)
EC: 3.4.21.36
Find proteins for P00772 (Sus scrofa)
Go to Gene View: CELA1
Go to UniProtKB:  P00772
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CA
Query on CA

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Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
TPX
Query on TPX

Download SDF File 
Download CCD File 
A
(2S,3S)-3-FORMYL-2-({[(4-METHYLPHENYL)SULFONYL]AMINO}METHYL)PENTANOIC ACID
C14 H19 N O5 S
IDDWUPNJUMHKFQ-DGCLKSJQSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.183 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 50.220α = 90.00
b = 57.630β = 90.00
c = 74.480γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
REFMACrefinement
X-PLORphasing
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-12-29
    Type: Initial release
  • Version 1.1: 2007-10-16
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance