4MBO

1.65 Angstrom Crystal Structure of Serine-rich Repeat Adhesion Glycoprotein (Srr1) from Streptococcus agalactiae


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.154 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Characterization of Fibrinogen Binding by Glycoproteins Srr1 and Srr2 of Streptococcus agalactiae.

Seo, H.S.Minasov, G.Seepersaud, R.Doran, K.S.Dubrovska, I.Shuvalova, L.Anderson, W.F.Iverson, T.M.Sullam, P.M.

(2013) J.Biol.Chem. 288: 35982-35996

  • DOI: 10.1074/jbc.M113.513358
  • Primary Citation of Related Structures:  4MBR

  • PubMed Abstract: 
  • The serine-rich repeat glycoproteins of Gram-positive bacteria comprise a large family of cell wall proteins. Streptococcus agalactiae (group B streptococcus, GBS) expresses either Srr1 or Srr2 on its surface, depending on the strain. Srr1 has recent ...

    The serine-rich repeat glycoproteins of Gram-positive bacteria comprise a large family of cell wall proteins. Streptococcus agalactiae (group B streptococcus, GBS) expresses either Srr1 or Srr2 on its surface, depending on the strain. Srr1 has recently been shown to bind fibrinogen, and this interaction contributes to the pathogenesis of GBS meningitis. Although strains expressing Srr2 appear to be hypervirulent, no ligand for this adhesin has been described. We now demonstrate that Srr2 also binds human fibrinogen and that this interaction promotes GBS attachment to endothelial cells. Recombinant Srr1 and Srr2 bound fibrinogen in vitro, with affinities of KD = 2.1 × 10(-5) and 3.7 × 10(-6) M, respectively, as measured by surface plasmon resonance spectroscopy. The binding site for Srr1 and Srr2 was localized to tandem repeats 6-8 of the fibrinogen Aα chain. The structures of both the Srr1 and Srr2 binding regions were determined and, in combination with mutagenesis studies, suggest that both Srr1 and Srr2 interact with a segment of these repeats via a "dock, lock, and latch" mechanism. Moreover, properties of the latch region may account for the increased affinity between Srr2 and fibrinogen. Together, these studies identify how greater affinity of Srr2 for fibrinogen may contribute to the increased virulence associated with Srr2-expressing strains.


    Organizational Affiliation

    From the Division of Infectious Diseases, Veterans Affairs Medical Center, University of California at San Francisco and the Northern California Institute for Research and Education, San Francisco, California 94121.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine-rich Repeat Adhesion Glycoprotein (Srr1)
A
340Streptococcus agalactiae serotype III (strain NEM316)N/A
Find proteins for Q8E473 (Streptococcus agalactiae serotype III (strain NEM316))
Go to UniProtKB:  Q8E473
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
BME
Query on BME

Download SDF File 
Download CCD File 
A
BETA-MERCAPTOETHANOL
C2 H6 O S
DGVVWUTYPXICAM-UHFFFAOYSA-N
 Ligand Interaction
MES
Query on MES

Download SDF File 
Download CCD File 
A
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MLZ
Query on MLZ
A
L-PEPTIDE LINKINGC7 H16 N2 O2LYS
Experimental Data & Validation

Experimental Data

Unit Cell:
Length (Å)Angle (°)
a = 73.356α = 90.00
b = 83.235β = 90.00
c = 57.056γ = 90.00
Software Package:
Software NamePurpose
HKL-3000data scaling
Blu-Icedata collection
REFMACrefinement
HKL-3000data reduction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Revision History 

  • Version 1.0: 2013-11-06
    Type: Initial release
  • Version 1.1: 2013-11-13
    Type: Database references
  • Version 1.2: 2014-01-01
    Type: Database references
  • Version 1.3: 2017-11-15
    Type: Refinement description