1ELC

Analogous inhibitors of elastase do not always bind analogously

• PDB DOI: https://doi.org/10.2210/pdb1ELC/pdb

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


• Deposited: 1993-12-07 Released: 1994-04-30 
• Deposition Author(s): Mattos, C., Rasmussen, B., Ding, X., Petsko, G.A., Ringe, D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.75 Å
• R-Value Work: 0.150 
• R-Value Observed: 0.150 

Literature

Analogous inhibitors of elastase do not always bind analogously.

Mattos, C., Rasmussen, B., Ding, X., Petsko, G.A., Ringe, D.

(1994) Nat Struct Biol 1: 55-58

• PubMed: 7656008 
• DOI: https://doi.org/10.1038/nsb0194-55
• Primary Citation of Related Structures:  
  1ELA, 1ELB, 1ELC


• PubMed Abstract: 
  

  It has been assumed that the structure of a single inhibitor complex is sufficient to define the available subsites of an enzyme that has a unique binding site and a uniquely defined mode for ligand binding--the specificity for these subsites can thus be probed by kinetic experiments. Elastase is an enzyme for which these traditional assumptions, which underlie such structural and kinetic studies, do not hold. Three new crystal structures of elastase complexed to chemically similar inhibitors with similar binding affinities reveal a diversity of binding modes as well as two new subsites on elastase. The existence of multiple binding sites and different binding modes for such similar inhibitors indicates that researchers must proceed with caution when using kinetics to map out protein subsites.

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Organizational Affiliation: 

Rosenstiel Basic Medical Sciences Research Center, 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: 26.48 kDa 
• Atom Count: 1,989 
• Modelled Residue Count: 240 
• Deposited Residue Count: 240 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
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 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
0Z3	B [auth A]	6-ammonio-N-(trifluoroacetyl)-L-norleucyl-N-[4-(1-methylethyl)phenyl]-L-phenylalaninamide C26 H34 F3 N4 O3 SKWCLCMPIGFAOR-VXKWHMMOSA-O
CA	C [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 2
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_000367 (0Z3)	B [auth A]	TRIFLUOROACETYL-L-PHENYLALANYL-P-ISOPROPYLANILID	Peptide-like / Inhibitor

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.75 Å
• R-Value Work: 0.150 
• R-Value Observed: 0.150 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 51.2	α = 90
b = 58	β = 90
c = 75.46	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: 1994-04-30 
Deposition Author(s): Mattos, C., Rasmussen, B., Ding, X., Petsko, G.A., Ringe, D.

Revision History  

• Version 1.0: 1994-04-30
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
• Version 1.3: 2012-12-12
  Changes: Other
• Version 1.4: 2024-06-05
  Changes: Data collection, Database references, Derived calculations, Other
• Version 1.5: 2024-11-20
  Changes: Structure summary