Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 56.14 kDa 
• Atom Count: 3166 
• Residue Count: 403 
• Unique protein chains: 1

1CMV

HUMAN CYTOMEGALOVIRUS PROTEASE

• DOI: 10.2210/pdb1CMV/pdb

• Classification: SERINE PROTEASE
• Organism(s): Human betaherpesvirus 5
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1996-08-26 Released: 1997-09-04 
• Deposition Author(s): Shieh, H.-S., Kurumbail, R.G., Stevens, A.M., Stegeman, R.A., Sturman, E.J., Pak, J.Y., Wittwer, A.J., Palmier, M.O., Wiegand, R.C., Holwerda, B.C., Stallings, W.C.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.27 Å
• R-Value Free: 0.310 
• R-Value Work: 0.241 
• R-Value Observed: 0.241 

Literature

Three-dimensional structure of human cytomegalovirus protease.

Shieh, H.S., Kurumbail, R.G., Stevens, A.M., Stegeman, R.A., Sturman, E.J., Pak, J.Y., Wittwer, A.J., Palmier, M.O., Wiegand, R.C., Holwerda, B.C., Stallings, W.C.

(1996) Nature 383: 279-282

• PubMed: 8805708 
• DOI: 10.1038/383279a0
• Primary Citation of Related Structures:  
  1CMV


• PubMed Abstract: 
  

Herpesviruses encode a serine protease that specifically cleaves assembly protein. This protease is critical for replication, and represents a new target for antiviral drug design. Here we report the three-dimensional structure of the protease from human cytomegalovirus (hCMV) at 2.27 angstroms resolution. The structure reveals a unique fold and new catalytic strategy for cleavage. The monomer fold of the enzyme, a seven-stranded beta-barrel encircled by a chain of helices that form the carboxy terminus of the molecule, is unrelated to those observed in classic serine proteases such as chymotrypsin and subtilisin. The serine nucleophile at position 132 is activated by two juxtaposed histidine residues at positions 63 and 157. Dimerization, which seems to be necessary for activity, is observed in the crystals. Correlations of the structure with the sequences of herpesvirus proteases suggest that dimerization may confer specificity and recognition in substrate binding.

---

Related Citations: 

• Activity of Two-Chain Recombinant Human Cytomegalovirus Protease
  Holwerda, B.C., Wittwer, A.J., Duffin, K.L., Smith, C., Toth, M.V., Carr, L.S., Wiegand, R.C., Bryant, M.L.
  (1994) J Biol Chem 269: 25911

---

Organizational Affiliation: 

Department of Medicinal and Structural Chemistry, Monsanto/Searle, Searle Discovery Research, St Louis, Missouri 63198, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HUMAN CYTOMEGALOVIRUS PROTEASE	A, B	256	Human betaherpesvirus 5	Mutation(s): 0  EC: 3.4.21 (PDB Primary Data), 3.4.21.97 (UniProt)
Find proteins for P16753 (Human cytomegalovirus (strain AD169)) Explore P16753  Go to UniProtKB:  P16753

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.27 Å
• R-Value Free: 0.310 
• R-Value Work: 0.241 
• R-Value Observed: 0.241 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 76.8	α = 90
b = 76.8	β = 90
c = 172.6	γ = 90

Software Package:

Software Name	Purpose
PHASES	phasing
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1996-08-26 
• Released Date: 1997-09-04 
Deposition Author(s): Shieh, H.-S., Kurumbail, R.G., Stevens, A.M., Stegeman, R.A., Sturman, E.J., Pak, J.Y., Wittwer, A.J., Palmier, M.O., Wiegand, R.C., Holwerda, B.C., Stallings, W.C.

Revision History 

• Version 1.0: 1997-09-04
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance