5HYU

Structure of human C4b-binding protein alpha chain CCP domains 1 and 2 in complex with the hypervariable region of group A Streptococcus M2 protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.561 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Conserved patterns hidden within group A Streptococcus M protein hypervariability recognize human C4b-binding protein.

Buffalo, C.Z.Bahn-Suh, A.J.Hirakis, S.P.Biswas, T.Amaro, R.E.Nizet, V.Ghosh, P.

(2016) Nat Microbiol 1: 16155-16155

  • DOI: 10.1038/nmicrobiol.2016.155
  • Primary Citation of Related Structures:  5HYP, 5HYT, 5HZP, 5I0Q

  • PubMed Abstract: 
  • No vaccine exists against group A Streptococcus (GAS), a leading cause of worldwide morbidity and mortality. A severe hurdle is the hypervariability of its major antigen, the M protein, with >200 different M types known. Neutralizing antibodies typic ...

    No vaccine exists against group A Streptococcus (GAS), a leading cause of worldwide morbidity and mortality. A severe hurdle is the hypervariability of its major antigen, the M protein, with >200 different M types known. Neutralizing antibodies typically recognize M protein hypervariable regions (HVRs) and confer narrow protection. In stark contrast, human C4b-binding protein (C4BP), which is recruited to the GAS surface to block phagocytic killing, interacts with a remarkably large number of M protein HVRs (apparently ∼90%). Such broad recognition is rare, and we discovered a unique mechanism for this through the structure determination of four sequence-diverse M proteins in complexes with C4BP. The structures revealed a uniform and tolerant 'reading head' in C4BP, which detected conserved sequence patterns hidden within hypervariability. Our results open up possibilities for rational therapies that target the M-C4BP interaction, and also inform a path towards vaccine design.


    Organizational Affiliation

    Department of Chemistry &Biochemistry, University of California, San Diego, La Jolla, California 92093, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
M protein, serotype 2.1
A
105Streptococcus pyogenesGene Names: emmL2.1
Find proteins for P50468 (Streptococcus pyogenes)
Go to UniProtKB:  P50468
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
C4b-binding protein alpha chain
B
128Homo sapiensGene Names: C4BPA (C4BP)
Find proteins for P04003 (Homo sapiens)
Go to Gene View: C4BPA
Go to UniProtKB:  P04003
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.561 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.208 
  • Space Group: P 43 3 2
Unit Cell:
Length (Å)Angle (°)
a = 148.313α = 90.00
b = 148.313β = 90.00
c = 148.313γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
PHENIXphasing
PHENIXrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationCountryGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesT32 GM007240
American Heart AssociationUnited States14PRE18320032
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesR01 AI096837
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesR01 AI077780

Revision History 

  • Version 1.0: 2016-07-20
    Type: Initial release
  • Version 1.1: 2016-10-26
    Type: Database references
  • Version 1.2: 2017-09-13
    Type: Author supporting evidence, Derived calculations