1LW6

Crystal Structure of the Complex of Subtilisin BPN' with Chymotrypsin Inhibitor 2 at 1.5 Angstrom Resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.170 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.6 of the entry. See complete history


Literature

A clogged gutter mechanism for protease inhibitors.

Radisky, E.S.Koshland Jr., D.E.

(2002) Proc Natl Acad Sci U S A 99: 10316-10321

  • DOI: https://doi.org/10.1073/pnas.112332899
  • Primary Citation of Related Structures:  
    1LW6

  • PubMed Abstract: 

    A classical peptide inhibitor of serine proteases that is hydrolyzed approximately 10(7) times more slowly than a good substrate is shown to form an acyl-enzyme intermediate rapidly. Despite this quick first step, further reaction is slowed dramatically because of tight and oriented binding of the cleaved peptide, preventing acyl-enzyme hydrolysis and favoring the reverse reaction. Moreover, this mechanism appears to be common to a large class of tight-binding serine protease inhibitors that mimic good substrates. The arrest of enzymatic reaction at the intermediate stage allowed us to determine that the consensus nucleophilic attack angle is close to 90 degrees in the reactive Michaelis complexes.


  • Organizational Affiliation

    Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
SUBTILISIN BPN'A [auth E]281Bacillus amyloliquefaciensMutation(s): 0 
EC: 3.4.21.62
UniProt
Find proteins for P00782 (Bacillus amyloliquefaciens)
Explore P00782 
Go to UniProtKB:  P00782
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00782
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
SUBTILISIN-CHYMOTRYPSIN INHIBITOR-2AB [auth I]64Hordeum vulgareMutation(s): 1 
UniProt
Find proteins for P01053 (Hordeum vulgare)
Explore P01053 
Go to UniProtKB:  P01053
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01053
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.170 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.332α = 90
b = 56.597β = 90
c = 118.635γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
CNSrefinement
MOSFLMdata reduction
CCP4data scaling
TRUNCATEdata scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-08-21
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2019-07-24
    Changes: Data collection, Refinement description
  • Version 1.5: 2021-10-27
    Changes: Database references, Derived calculations
  • Version 1.6: 2024-02-14
    Changes: Data collection, Refinement description