1FLC

X-RAY STRUCTURE OF THE HAEMAGGLUTININ-ESTERASE-FUSION GLYCOPROTEIN OF INFLUENZA C VIRUS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.223 

wwPDB Validation 3D Report Full Report



Literature

Structure of the haemagglutinin-esterase-fusion glycoprotein of influenza C virus.

Rosenthal, P.B.Zhang, X.

(1998) Nature 396: 92-96

  • DOI: 10.1038/23974
  • Primary Citation of Related Structures:  
    1FLC

  • PubMed Abstract: 
  • The spike glycoproteins of the lipid-enveloped orthomyxoviruses and paramyxoviruses have three functions: to recognize the receptor on the cell surface, to mediate viral fusion with the cell membrane, and to destroy the receptor. In influenza C virus ...

    The spike glycoproteins of the lipid-enveloped orthomyxoviruses and paramyxoviruses have three functions: to recognize the receptor on the cell surface, to mediate viral fusion with the cell membrane, and to destroy the receptor. In influenza C virus, a single glycoprotein, the haemagglutinin-esterase-fusion (HEF) protein, possesses all three functions. In influenza A and B, the first two activities are mediated by haemagglutinin and the third by a second glycoprotein, neuraminidase. Here we report the crystal structure of the HEF envelope glycoprotein of influenza C virus. We have identified the receptor-binding site and the receptor-destroying enzyme (9-O-acetylesterase) sites, by using receptor analogues. The receptor-binding domain is structurally similar to the sialic acid-binding domain of influenza A haemagglutinin, but binds 9-O-acetylsialic acid. The esterase domain has a structure similar to the esterase from Streptomyces scabies and a brain acetylhydrolase. The receptor domain is inserted into a surface loop of the esterase domain and the esterase domain is inserted into a surface loop of the stem. The stem domain is similar to that of influenza A haemagglutinin, except that the triple-stranded, alpha-helical bundle diverges at both of its ends, and the amino terminus of HEF2, the fusion peptide, is partially exposed. The segregation of HEF's three functions into structurally distinct domains suggests that the entire stem region, including sequences at the amino and carboxy termini of HEF1 which precede the post-translational cleavage site between HEF1 and HEF2, forms an independent fusion domain which is probably derived from an ancestral membrane fusion protein.


    Organizational Affiliation

    Department of Molecular and Cellular Biology, Harvard University, Cambridge, Massachusetts 02138, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HAEMAGGLUTININ-ESTERASE-FUSION GLYCOPROTEINACE432Influenza C virus (C/Johannesburg/1/66)Mutation(s): 0 
Gene Names: HE
EC: 3.1.1.53
Find proteins for P07975 (Influenza C virus (strain C/Johannesburg/1/1966))
Explore P07975 
Go to UniProtKB:  P07975
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
HAEMAGGLUTININ-ESTERASE-FUSION GLYCOPROTEINBDF175Influenza C virus (C/Johannesburg/1/66)Mutation(s): 0 
Gene Names: HE
EC: 3.1.1.53
Find proteins for P07975 (Influenza C virus (strain C/Johannesburg/1/1966))
Explore P07975 
Go to UniProtKB:  P07975
Protein Feature View
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  • Reference Sequence
Oligosaccharides

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Entity ID: 3
MoleculeChainsChain Length2D Diagram Glycosylation
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
G, H, I, J, L, M, O, Q, R, S, T
3 N-Glycosylation
Entity ID: 4
MoleculeChainsChain Length2D Diagram Glycosylation
alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-alpha-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
K, P, U
3 N-Glycosylation
Entity ID: 5
MoleculeChainsChain Length2D Diagram Glycosylation
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-alpha-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
N
3 N-Glycosylation
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.223 
  • R-Value Observed: 0.223 
  • Space Group: P 43 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 155.4α = 90
b = 155.4β = 90
c = 414.4γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
X-PLORrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-03-01
    Type: Initial release
  • Version 1.1: 2008-04-26
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Refinement description
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary