Crystal Structure of HSV-1 UL21 C-terminal Domain

Experimental Data Snapshot

  • Resolution: 2.72 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.218 

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This is version 1.4 of the entry. See complete history


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

  • DOI: https://doi.org/10.1128/JVI.00475-16
  • Primary Citation of Related Structures:  

  • 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.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tegument protein UL21252Human alphaherpesvirus 1 strain 17Mutation(s): 0 
Gene Names: UL21
Find proteins for P10205 (Human herpesvirus 1 (strain 17))
Explore P10205 
Go to UniProtKB:  P10205
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP10205
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • 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 = 54.273α = 90
b = 54.273β = 90
c = 180.757γ = 90
Software Package:
Software NamePurpose
SCALAdata scaling
RESOLVEmodel building
Cootmodel building
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesF31 GM115121
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesP41 GM103403
National Institutes of Health/National Center for Research Resources (NIH/NCRR)United StatesS10 RR029205

Revision History  (Full details and data files)

  • 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
  • Version 1.4: 2024-03-06
    Changes: Data collection, Database references