Crystal structure of KSHV protease in complex with hexapeptide phosphonate inhibitor

Experimental Data Snapshot

  • Resolution: 1.73 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.161 
  • R-Value Observed: 0.163 

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Substrate modulation of enzyme activity in the herpesvirus protease family.

Lazic, A.Goetz, D.H.Nomura, A.M.Marnett, A.B.Craik, C.S.

(2007) J Mol Biol 373: 913-923

  • DOI: https://doi.org/10.1016/j.jmb.2007.07.073
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The herpesvirus proteases are an example in which allosteric regulation of an enzyme activity is achieved through the formation of quaternary structure. Here, we report a 1.7 A resolution structure of Kaposi's sarcoma-associated herpesvirus protease in complex with a hexapeptide transition state analogue that stabilizes the dimeric state of the enzyme. Extended substrate binding sites are induced upon peptide binding. In particular, 104 A2 of surface are buried in the newly formed S4 pocket when tyrosine binds at this site. The peptide inhibitor also induces a rearrangement of residues that stabilizes the oxyanion hole and the dimer interface. Concomitant with the structural changes, an increase in catalytic efficiency of the enzyme results upon extended substrate binding. A nearly 20-fold increase in kcat/KM results upon extending the peptide substrate from a tetrapeptide to a hexapeptide exclusively due to a KM effect. This suggests that the mechanism by which herpesvirus proteases achieve their high specificity is by using extended substrates to modulate both the structure and activity of the enzyme.

  • Organizational Affiliation

    Department of Pharmaceutical Chemistry, University of California, San Francisco, CA 94158-2517, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
KSHV protease
A, B
228Human gammaherpesvirus 8Mutation(s): 1 
Gene Names: AF010430
Find proteins for O36607 (Human herpesvirus 8)
Explore O36607 
Go to UniProtKB:  O36607
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO36607
Sequence Annotations
  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
hexapeptide phosphonate inhibitor
C, D
7N/AMutation(s): 0 
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on TBG
C, D
Experimental Data & Validation

Experimental Data

  • Resolution: 1.73 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.161 
  • R-Value Observed: 0.163 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.883α = 90
b = 108.941β = 103.71
c = 54.051γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
CrystalCleardata collection
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-12-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Atomic model, Database references, Derived calculations, Non-polymer description, Refinement description, Source and taxonomy, Structure summary, Version format compliance
  • Version 1.2: 2012-12-12
    Changes: Other
  • Version 1.3: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-08-30
    Changes: Data collection, Refinement description
  • Version 1.5: 2023-11-15
    Changes: Data collection, Derived calculations