Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

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

Macromolecule Content

• Total Structure Weight: 27.57 kDa 
• Atom Count: 1941 
• Residue Count: 252 
• Unique protein chains: 1

5ED7

Crystal Structure of HSV-1 UL21 C-terminal Domain

• DOI: 10.2210/pdb5ED7/pdb

• Classification: VIRAL PROTEIN
• Organism(s): Human alphaherpesvirus 1 strain 17
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2015-10-20 Released: 2016-04-20 
• Deposition Author(s): Metrick, C.M., Heldwein, E.E.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), National Institutes of Health/National Center for Research Resources (NIH/NCRR)

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.72 Å
• R-Value Free: 0.234 
• R-Value Work: 0.218 
• R-Value Observed: 0.218 

Literature

Novel Structure and Unexpected RNA-Binding Ability of the C-Terminal Domain of Herpes Simplex Virus 1 Tegument Protein UL21.

Metrick, C.M., Heldwein, E.E.

(2016) J Virol 90: 5759-5769

• PubMed: 27053559 
• DOI: 10.1128/JVI.00475-16
• Primary Citation of Related Structures:  
  5ED7


• PubMed Abstract: 
  

Proteins forming the tegument layers of herpesviral virions mediate many essential processes in the viral replication cycle, yet few have been characterized in detail. UL21 is one such multifunctional tegument protein and is conserved among alphaherpesviruses. While UL21 has been implicated in many processes in viral replication, ranging from nuclear egress to virion morphogenesis to cell-cell spread, its precise roles remain unclear. Here we report the 2.7-Å crystal structure of the C-terminal domain of herpes simplex virus 1 (HSV-1) UL21 (UL21C), which has a unique α-helical fold resembling a dragonfly. Analysis of evolutionary conservation patterns and surface electrostatics pinpointed four regions of potential functional importance on the surface of UL21C to be pursued by mutagenesis. In combination with the previously determined structure of the N-terminal domain of UL21, the structure of UL21C provides a 3-dimensional framework for targeted exploration of the multiple roles of UL21 in the replication and pathogenesis of alphaherpesviruses. Additionally, we describe an unanticipated ability of UL21 to bind RNA, which may hint at a yet unexplored function.

---

Organizational Affiliation: 

Department of Molecular Biology and Microbiology and Graduate Program in Biochemistry, Sackler School of Graduate Biomedical Sciences, Tufts University School of Medicine, Boston, Massachusetts, USAUniversity of California, Irvine [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Tegument protein UL21	A	252	Human alphaherpesvirus 1 strain 17	Mutation(s): 0  Gene Names: UL21
Find proteins for P10205 (Human herpesvirus 1 (strain 17)) Explore P10205  Go to UniProtKB:  P10205

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CL	A	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.72 Å
• R-Value Free: 0.234 
• R-Value Work: 0.218 
• R-Value Observed: 0.218 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 54.273	α = 90
b = 54.273	β = 90
c = 180.757	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
SCALA	data scaling
SHELX	phasing
RESOLVE	model building
Coot	model building
PDB_EXTRACT	data extraction
XDS	data reduction

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2015-10-20 
• Released Date: 2016-04-20 
Deposition Author(s): Metrick, C.M., Heldwein, E.E.

---

Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	F31 GM115121
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	P41 GM103403
National Institutes of Health/National Center for Research Resources (NIH/NCRR)	United States	S10 RR029205

Revision History 

• Version 1.0: 2016-04-20
  Type: Initial release
  
• Version 1.1: 2016-06-08
  Changes: Database references
• Version 1.2: 2017-09-20
  Changes: Author supporting evidence, Database references, Derived calculations
• Version 1.3: 2019-12-04
  Changes: Author supporting evidence