6Q18

Human antibody H1244 in complex with the influenza hemagglutinin head domain of A/Beijing/262/95(H1N1)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.208 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Affinity maturation in a human humoral response to influenza hemagglutinin.

McCarthy, K.R.Raymond, D.D.Do, K.T.Schmidt, A.G.Harrison, S.C.

(2019) Proc Natl Acad Sci U S A 

  • DOI: https://doi.org/10.1073/pnas.1915620116
  • Primary Citation of Related Structures:  
    6Q0E, 6Q0H, 6Q0I, 6Q0L, 6Q0O, 6Q18, 6Q19, 6Q1A, 6Q1E, 6Q1G, 6Q1J, 6Q1K

  • PubMed Abstract: 

    Affinity maturation of the B cell antigen receptor (BCR) is a conserved and crucial component of the adaptive immune response. BCR lineages, inferred from paired heavy- and light-chain sequences of rearranged Ig genes from multiple descendants of the same naive B cell precursor (the lineages' unmutated common ancestor, "UCA"), make it possible to reconstruct the underlying somatic evolutionary history. We present here an extensive structural and biophysical analysis of a lineage of BCRs directed against the receptor binding site (RBS) of subtype H1 influenza virus hemagglutinin (HA). The lineage includes 8 antibodies detected directly by sequencing, 3 in 1 principal branch and 5 in the other. When bound to HA, the heavy-chain third complementarity determining region (HCDR3) fits with an invariant pose into the RBS, but in each of the 2 branches, the rest of the Fab reorients specifically, from its position in the HA-bound UCA, about a hinge at the base of HCDR3. New contacts generated by the reorientation compensate for contacts lost as the H1 HA mutated during the time between the donor's initial exposure and the vaccination that preceded sampling. Our data indicate that a "pluripotent" naive response differentiated, in each branch, into 1 of its possible alternatives. This property of naive BCRs and persistence of multiple branches of their progeny lineages can offer broader protection from evolving pathogens than can a single, linear pathway of somatic mutation.


  • Organizational Affiliation

    Laboratory of Molecular Medicine, Boston Children's Hospital and Harvard Medical School, Boston, MA 02115.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Hemagglutinin223Influenza A virus (A/Beijing/262/1995(H1N1))Mutation(s): 0 
Gene Names: HA
UniProt
Find proteins for B4UPF7 (Influenza A virus)
Explore B4UPF7 
Go to UniProtKB:  B4UPF7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB4UPF7
Glycosylation
Glycosylation Sites: 1
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
H1244 Fab lambda chainB [auth L]217Homo sapiensMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
H1244 Fab heavy chainC [auth H]243Homo sapiensMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.208 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58α = 90
b = 69.64β = 90
c = 191.49γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI089618
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI117892

Revision History  (Full details and data files)

  • Version 1.0: 2019-12-18
    Type: Initial release
  • Version 1.1: 2020-01-01
    Changes: Database references
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary