4BHU

Crystal structure of BslA - A bacterial hydrophobin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.91 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.167 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Bsla is a Self-Assembling Bacterial Hydrophobin that Coats the Bacillus Subtilis Biofilm.

Hobley, L.Ostrowski, A.Rao, F.V.Bromley, K.M.Porter, M.Prescott, A.R.Macphee, C.E.Van Aalten, D.M.F.Stanley-Wall, N.R.

(2013) Proc Natl Acad Sci U S A 110: 13600

  • DOI: 10.1073/pnas.1306390110
  • Primary Citation of Related Structures:  
    4BHU

  • PubMed Abstract: 
  • Biofilms represent the predominant mode of microbial growth in the natural environment. Bacillus subtilis is a ubiquitous Gram-positive soil bacterium that functions as an effective plant growth-promoting agent. The biofilm matrix is composed of an exopolysaccharide and an amyloid fiber-forming protein, TasA, and assembles with the aid of a small secreted protein, BslA ...

    Biofilms represent the predominant mode of microbial growth in the natural environment. Bacillus subtilis is a ubiquitous Gram-positive soil bacterium that functions as an effective plant growth-promoting agent. The biofilm matrix is composed of an exopolysaccharide and an amyloid fiber-forming protein, TasA, and assembles with the aid of a small secreted protein, BslA. Here we show that natively synthesized and secreted BslA forms surface layers around the biofilm. Biophysical analysis demonstrates that BslA can self-assemble at interfaces, forming an elastic film. Molecular function is revealed from analysis of the crystal structure of BslA, which consists of an Ig-type fold with the addition of an unusual, extremely hydrophobic "cap" region. A combination of in vivo biofilm formation and in vitro biophysical analysis demonstrates that the central hydrophobic residues of the cap are essential to allow a hydrophobic, nonwetting biofilm to form as they control the surface activity of the BslA protein. The hydrophobic cap exhibits physiochemical properties remarkably similar to the hydrophobic surface found in fungal hydrophobins; thus, BslA is a structurally defined bacterial hydrophobin. We suggest that biofilms formed by other species of bacteria may have evolved similar mechanisms to provide protection to the resident bacterial community.


    Organizational Affiliation

    Division of Molecular Microbiology, College of Life Sciences, University of Dundee, Dundee DD1 5EH, United Kingdom.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
UNCHARACTERIZED PROTEIN YUAB
A, B, C, D, E, F, G, H
A, B, C, D, E, F, G, H, J
130Bacillus subtilis subsp. subtilis NCIB 3610 = ATCC 6051 = DSM 10Mutation(s): 1 
UniProt
Find proteins for P71014 (Bacillus subtilis (strain 168))
Explore P71014 
Go to UniProtKB:  P71014
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
UNCHARACTERIZED PROTEIN YUABI130Bacillus subtilis subsp. subtilis NCIB 3610 = ATCC 6051 = DSM 10Mutation(s): 1 
UniProt
Find proteins for P71014 (Bacillus subtilis (strain 168))
Explore P71014 
Go to UniProtKB:  P71014
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download Ideal Coordinates CCD File 
K [auth A], M [auth B], Q [auth E], T [auth F], U [auth F], Z [auth J]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download Ideal Coordinates CCD File 
L [auth A] , N [auth B] , O [auth C] , P [auth C] , R [auth E] , S [auth E] , V [auth F] , W [auth H] , 
L [auth A],  N [auth B],  O [auth C],  P [auth C],  R [auth E],  S [auth E],  V [auth F],  W [auth H],  X [auth I],  Y [auth I]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
MLY
Query on MLY
A , B , C , D , E , F , G , H , 
A,  B,  C,  D,  E,  F,  G,  H,  J
L-PEPTIDE LINKINGC8 H18 N2 O2LYS
MSE
Query on MSE
A , B , C , D , E , F , G , H , 
A,  B,  C,  D,  E,  F,  G,  H,  J
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.91 Å
  • R-Value Free: 0.199 
  • R-Value Work: 0.165 
  • R-Value Observed: 0.167 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.7α = 90
b = 95.98β = 90
c = 259.81γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
SCALAdata scaling
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-08-14
    Type: Initial release
  • Version 1.1: 2013-08-28
    Changes: Database references