Crystal Structure Analysis of Thermolysin Complexed with the Inhibitor (S)-thiorphan

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Work: 0.183 
  • R-Value Observed: 0.183 

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Thiorphan and retro-thiorphan display equivalent interactions when bound to crystalline thermolysin

Roderick, S.L.Fournie-Zaluski, M.C.Roques, B.P.Matthews, B.W.

(1989) Biochemistry 28: 1493-1497

  • DOI: https://doi.org/10.1021/bi00430a011
  • Primary Citation of Related Structures:  
    1Z9G, 1ZDP

  • PubMed Abstract: 

    The three-dimensional structures of (S)-thiorphan and (R)-retro-thiorphan bound to thermolysin have been determined crystallographically and refined to residuals of 0.183 and 0.187 at 1.7-A resolution. Thiorphan [N-[(S)-2-(mercaptomethyl)-1-oxo-3-phenylpropyl]glycine] [HSCH2CH(CH2C6H5)CONHC-H2COOH] and retro-thiorphan [[[(R)-1-(mercaptomethyl)-2-phenylethyl] amino]-3-oxopropanoic acid] [HSCH2CH(CH2C6H5)NHCOCH2COOH] are isomeric thiol-containing inhibitors of endopeptidase EC 24-11 (also called "enkephalinase"). The mode of binding of thiorphan to thermolysin is similar to that of (2-benzyl-3-mercaptopropanoyl)-L-alanylglycinamide [Monzingo, A.F., & Matthews, B.W. (1982) Biochemistry 21, 3390-3394] with the inhibitor sulfur atom coordinated to the active site zinc and the peptide portion forming substrate-like interactions with the enzyme. The isomeric inhibitor retro-thiorphan, which differs from thiorphan by the inversion of an amide bond, utilizes very similar interactions with enzyme. Despite the inversion of the -CO-NH- linkage the carbonyl oxygen and amide nitrogen display very similar hydrogen bonding, as anticipated by B.P. Roques et al. [(1983) Proc. Natl. Acad. Sci. U.S.A. 80, 3178-3182]. These results explain why thermolysin and possibly other zinc endopeptidases such as endopeptidase EC 24-11 fail to discriminate between these retro-inverso inhibitors.

  • Organizational Affiliation

    Institute of Molecular Biology, University of Oregon, Eugene 97403.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ThermolysinA [auth E]316Bacillus thermoproteolyticusMutation(s): 0 
Find proteins for P00800 (Bacillus thermoproteolyticus)
Explore P00800 
Go to UniProtKB:  P00800
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00800
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
TIO PDBBind:  1ZDP Ki: 1800 (nM) from 1 assay(s)
BindingDB:  1ZDP Ki: 1800 (nM) from 1 assay(s)
IC50: min: 1800, max: 9500 (nM) from 2 assay(s)
Binding MOAD:  1ZDP Ki: 1800 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Work: 0.183 
  • R-Value Observed: 0.183 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 94α = 90
b = 94β = 90
c = 132.1γ = 120
Software Package:
Software NamePurpose
OSCTSTdata collection
ROTAVATAdata reduction
OSCTSTdata reduction
CCP4data scaling
ROTAVATAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-04-26
    Type: Initial release
  • Version 1.1: 2008-04-30
    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: 2023-08-23
    Changes: Data collection, Database references, Derived calculations, Refinement description