Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Macromolecule Content

• Total Structure Weight: 48.08 kDa 
• Atom Count: 3102 
• Residue Count: 384 
• Unique protein chains: 2

5D5N

Crystal Structure of the Human Cytomegalovirus pUL50-pUL53 Complex

• DOI: 10.2210/pdb5D5N/pdb

• Classification: VIRAL PROTEIN
• Organism(s): Human herpesvirus 5 strain AD169
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2015-08-11 Released: 2015-10-07 
• Deposition Author(s): Walzer, S.A., Egerer-Sieber, C., Hohl, K., Sevvana, M., Muller, Y.A.
• Funding Organization(s): DFG

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.44 Å
• R-Value Free: 0.287 
• R-Value Work: 0.221 
• R-Value Observed: 0.226 

Literature

Crystal Structure of the Human Cytomegalovirus pUL50-pUL53 Core Nuclear Egress Complex Provides Insight into a Unique Assembly Scaffold for Virus-Host Protein Interactions.

Walzer, S.A., Egerer-Sieber, C., Sticht, H., Sevvana, M., Hohl, K., Milbradt, J., Muller, Y.A., Marschall, M.

(2015) J Biol Chem 290: 27452-27458

• PubMed: 26432641 
• DOI: 10.1074/jbc.C115.686527
• Primary Citation of Related Structures:  
  5D5N


• PubMed Abstract: 
  

Nuclear replication of cytomegalovirus relies on elaborate mechanisms of nucleocytoplasmic egress of viral particles. Thus, the role of two essential and conserved viral nuclear egress proteins, pUL50 and pUL53, is pivotal. pUL50 and pUL53 heterodimerize and form a core nuclear egress complex (NEC), which is anchored to the inner nuclear membrane and provides a scaffold for the assembly of a multimeric viral-cellular NEC. Here, we report the crystal structure of the pUL50-pUL53 heterodimer (amino acids 1-175 and 50-292, respectively) at 2.44 Å resolution. Both proteins adopt a globular fold with mixed α and β secondary structure elements. pUL53-specific features include a zinc-binding site and a hook-like N-terminal extension, the latter representing a hallmark element of the pUL50-pUL53 interaction. The hook-like extension (amino acids 59-87) embraces pUL50 and contributes 1510 Å(2) to the total interface area (1880 Å(2)). The pUL50 structure overall resembles the recently published NMR structure of the murine cytomegalovirus homolog pM50 but reveals a considerable repositioning of the very C-terminal α-helix of pUL50 upon pUL53 binding. pUL53 shows structural resemblance with the GHKL domain of bacterial sensory histidine kinases. A close examination of the crystal structure indicates partial assembly of pUL50-pUL53 heterodimers to hexameric ring-like structures possibly providing additional scaffolding opportunities for NEC. In combination, the structural information on pUL50-pUL53 considerably improves our understanding of the mechanism of HCMV nuclear egress. It may also accelerate the validation of the NEC as a unique target for developing a novel type of antiviral drug and improved options of broad-spectrum antiherpesviral therapy.

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Organizational Affiliation: 

Institute for Clinical and Molecular Virology, Friedrich-Alexander University of Erlangen-Nürnberg, 91054 Erlangen, Germany [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Virion egress protein UL34 homolog	A	175	Human herpesvirus 5 strain AD169	Mutation(s): 0  Gene Names: UL50
Find proteins for Q6SW81 (Human cytomegalovirus (strain Merlin)) Explore Q6SW81  Go to UniProtKB:  Q6SW81

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Virion egress protein UL31 homolog	B	249	Human herpesvirus 5 strain AD169	Mutation(s): 0  Gene Names: UL53
Find proteins for F5HFZ4 (Human cytomegalovirus (strain Merlin)) Explore F5HFZ4  Go to UniProtKB:  F5HFZ4

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	B	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.44 Å
• R-Value Free: 0.287 
• R-Value Work: 0.221 
• R-Value Observed: 0.226 
• Space Group: P 6

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 118.153	α = 90
b = 118.153	β = 90
c = 73.623	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
XDS	data scaling
SHELX	phasing
PHENIX	model building
Coot	model building

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2015-08-11 
• Released Date: 2015-10-07 
Deposition Author(s): Walzer, S.A., Egerer-Sieber, C., Hohl, K., Sevvana, M., Muller, Y.A.

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Funding Organization	Location	Grant Number
DFG	Germany	SFB796

Revision History 

• Version 1.0: 2015-10-07
  Type: Initial release
  
• Version 1.1: 2015-10-14
  Changes: Database references
• Version 1.2: 2015-11-25
  Changes: Database references