1IEG

CRYSTAL STRUCTURE OF THE CATALYTIC SITE MUTANT S134A/H157A OF THE HUMAN CYTOMEGALOVIRUS PROTEASE

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.226 

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This is version 1.3 of the entry. See complete history. 


Literature

Investigating the role of histidine 157 in the catalytic activity of human cytomegalovirus protease.

Khayat, R., Batra, R., Massariol, M.J., Lagace, L., Tong, L.

(2001) Biochemistry 40: 6344-6351

  • DOI: 10.1021/bi010158b
  • Primary Citation of Related Structures:  
    1ID4, 1IEC, 1IED, 1IEF, 1IEG

  • PubMed Abstract: 

    • Herpesvirus proteases belong to a new class of serine proteases and contain a novel Ser-His-His catalytic triad, while classical serine proteases have an acidic residue as the third member. To gain a better understanding of the molecular basis for the functional role of the third-member His residue, we have carried out structural and biochemical investigations of human cytomegalovirus (HCMV) protease that bears mutations of the His157 third member ...

    Herpesvirus proteases belong to a new class of serine proteases and contain a novel Ser-His-His catalytic triad, while classical serine proteases have an acidic residue as the third member. To gain a better understanding of the molecular basis for the functional role of the third-member His residue, we have carried out structural and biochemical investigations of human cytomegalovirus (HCMV) protease that bears mutations of the His157 third member. Kinetic studies showed that all the mutants have reduced catalytic activity. Structural studies revealed that a solvent molecule is hydrogen-bonded to the His63 second member and Ser134 in the H157A mutant, partly rescuing the activity of this mutant. This is confirmed by our kinetic and structural observations on the S134A/H157A double mutant, which showed further reductions in the catalytic activity. The structure of the H157A mutant is also in complex with the PMSF inhibitor. The H157E mutant has the best catalytic activity among the mutants; its structure, however, showed conformational readjustments of the His63 and Ser132 residues. The Ser132-His63 diad of HCMV protease has similar activity as the diads in classical serine proteases, whereas the contribution of the His157 third member to the catalysis is much smaller. Finally, structural comparisons revealed the presence of two conserved structural water molecules at the bottom of the S(1) pocket, suggesting a possible new direction for the design of HCMV protease inhibitors.

    Organizational Affiliation: 

    Department of Biological Sciences, Columbia University, New York, New York 10027, USA.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CAPSID PROTEIN P40: ASSEMBLIN PROTEASEA, B256Human herpesvirus 5 strain AD169Mutation(s): 3 
Gene Names: UL80, APNG
EC: 3.4.21.97
UniProt
Find proteins for P16753 (Human cytomegalovirus (strain AD169))
Explore P16753 
Go to UniProtKB:  P16753
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP16753
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.226 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76α = 90
b = 76β = 90
c = 167.6γ = 90
Software Package:
Software NamePurpose
GLRFphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-06-06
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.3: 2021-10-27
    Changes: Database references