4HSI

Glycoprotein B from Herpes simplex virus type 1, A504P/R505G/Q507G/N511G mutant, low-pH


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.230 

wwPDB Validation   3D Report Full Report



Literature

Extensive Mutagenesis of the HSV-1 gB Ectodomain Reveals Remarkable Stability of Its Postfusion Form.

Vitu, E.Sharma, S.Stampfer, S.D.Heldwein, E.E.

(2013) J Mol Biol 425: 2056-2071

  • DOI: 10.1016/j.jmb.2013.03.001
  • Primary Citation of Related Structures:  
    4HSI

  • PubMed Abstract: 
  • Viral fusogens mediate the merger of the viral envelope and cellular membrane during viral entry. These proteins share little sequence similarity but all are thought to act by refolding through a series of conformational intermediates from the metast ...

    Viral fusogens mediate the merger of the viral envelope and cellular membrane during viral entry. These proteins share little sequence similarity but all are thought to act by refolding through a series of conformational intermediates from the metastable prefusion form to the stable postfusion form. Crystal structures of both prefusion and postfusion forms have illuminated the conformational pathways of several viral fusogens. By contrast, only the structure of the postfusion form is available for glycoprotein B (gB), the conserved fusogen of herpesviruses. To gain insight into the nature of the fusogenic conformational changes in gB, we used several approaches aimed at engineering the prefusion form of the herpes simplex virus type 1 gB ectodomain, including modifications intended to stabilize the prefusion form and novel mutations aimed at destabilizing the postfusion form. We found that the postfusion conformation of gB is remarkably stable and resistant to perturbations. Several mutations successfully destabilized the gB trimer, identifying regions that are critical for the stability of the postfusion form. Yet, none of the constructs adopted the prefusion conformation. We propose that the soluble ectodomain of gB folds into the postfusion form without first adopting the prefusion intermediate. These results suggest that other regions of gB, including the transmembrane region and the cytoplasmic domain, may be necessary to establish and maintain the metastable prefusion conformation.


    Organizational Affiliation

    Department of Molecular Biology and Microbiology, Tufts University School of Medicine, Boston, MA 02111, USA; Graduate Program in Biochemistry, Sackler School of Graduate Biomedical Sciences, Tufts University School of Medicine, Boston, MA 02111, USA. Electronic address: katya.heldwein@tufts.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Envelope glycoprotein BABCD703Human alphaherpesvirus 1 strain KOSMutation(s): 4 
Gene Names: gBUL27
Find proteins for P06437 (Human herpesvirus 1 (strain KOS))
Explore P06437 
Go to UniProtKB:  P06437
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
E, F
2 N-Glycosylation Oligosaccharides Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.230 
  • Space Group: P 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 117.295α = 90
b = 117.295β = 90
c = 321.872γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
PHENIXmodel building
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2012-10-30 
  • Released Date: 2013-03-27 
  • Deposition Author(s): Heldwein, E.E.

Revision History 

  • Version 1.0: 2013-03-27
    Type: Initial release
  • Version 1.1: 2013-05-29
    Changes: Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Structure summary