Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 99.23 kDa 
• Atom Count: 7,488 
• Modelled Residue Count: 847 
• Deposited Residue Count: 849 
• Unique protein chains: 1

 4CU6

Unravelling the multiple functions of the architecturally intricate Streptococcus pneumoniae beta-galactosidase, BgaA

• PDB DOI:  https://doi.org/10.2210/pdb4CU6/pdb

• Classification: HYDROLASE
• Organism(s): Streptococcus pneumoniae TIGR4
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2014-03-17 Released: 2014-08-20 
• Deposition Author(s): Singh, A.K., Pluvinage, B., Higgins, M.A., Dalia, A.B., Flynn, M., Lloyd, A.R., Weiser, J.N., Stubbs, K.A., Boraston, A.B., King, S.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.221 
• R-Value Work: 0.178 
• R-Value Observed: 0.180 

Literature

Unravelling the Multiple Functions of the Architecturally Intricate Streptococcus Pneumoniae Beta-Galactosidase, Bgaa.

Singh, A.K., Pluvinage, B., Higgins, M.A., Dalia, A.B., Woodiga, S.A., Flynn, M., Lloyd, A.R., Weiser, J.N., Stubbs, K.A., Boraston, A.B., King, S.J.

(2014) PLoS Pathog 10: 04364

• PubMed: 25210925 
• DOI: https://doi.org/10.1371/journal.ppat.1004364
• Primary Citation of Related Structures:  
  4CU6, 4CU7, 4CU8, 4CU9, 4CUA, 4CUB, 4CUC


• PubMed Abstract: 
  

Bacterial cell-surface proteins play integral roles in host-pathogen interactions. These proteins are often architecturally and functionally sophisticated and yet few studies of such proteins involved in host-pathogen interactions have defined the domains or modules required for specific functions. Streptococcus pneumoniae (pneumococcus), an opportunistic pathogen that is a leading cause of community acquired pneumonia, otitis media and bacteremia, is decorated with many complex surface proteins. These include β-galactosidase BgaA, which is specific for terminal galactose residues β-1-4 linked to glucose or N-acetylglucosamine and known to play a role in pneumococcal growth, resistance to opsonophagocytic killing, and adherence. This study defines the domains and modules of BgaA that are required for these distinct contributions to pneumococcal pathogenesis. Inhibitors of β-galactosidase activity reduced pneumococcal growth and increased opsonophagocytic killing in a BgaA dependent manner, indicating these functions require BgaA enzymatic activity. In contrast, inhibitors increased pneumococcal adherence suggesting that BgaA bound a substrate of the enzyme through a distinct module or domain. Extensive biochemical, structural and cell based studies revealed two newly identified non-enzymatic carbohydrate-binding modules (CBMs) mediate adherence to the host cell surface displayed lactose or N-acetyllactosamine. This finding is important to pneumococcal biology as it is the first adhesin-carbohydrate receptor pair identified, supporting the widely held belief that initial pneumococcal attachment is to a glycoconjugate. Perhaps more importantly, this is the first demonstration that a CBM within a carbohydrate-active enzyme can mediate adherence to host cells and thus this study identifies a new class of carbohydrate-binding adhesins and extends the paradigm of CBM function. As other bacterial species express surface-associated carbohydrate-active enzymes containing CBMs these findings have broad implications for bacterial adherence. Together, these data illustrate that comprehending the architectural sophistication of surface-attached proteins can increase our understanding of the different mechanisms by which these proteins can contribute to bacterial pathogenesis.

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Organizational Affiliation: 

Center for Microbial Pathogenesis, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio, United States of America; Department of Pediatrics, The Ohio State University, Columbus, Ohio, United States of America.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
BETA-GALACTOSIDASE	A	849	Streptococcus pneumoniae TIGR4	Mutation(s): 0  Gene Names: bgaA, SP_0648 EC: 3.2.1.23
UniProt
Find proteins for A0A0H2UP19 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4)) Explore A0A0H2UP19  Go to UniProtKB:  A0A0H2UP19

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	NA [auth A], OA [auth A], PA [auth A], QA [auth A], RA [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
EDO	AA [auth A], B [auth A], BA [auth A], C [auth A], CA [auth A], D [auth A], DA [auth A], E [auth A], EA [auth A], F [auth A], FA [auth A], G [auth A], GA [auth A], H [auth A], HA [auth A], I [auth A], IA [auth A], J [auth A], JA [auth A], K [auth A], KA [auth A], L [auth A], LA [auth A], M [auth A], MA [auth A], N [auth A], O [auth A], P [auth A], Q [auth A], R [auth A], S [auth A], SA [auth A], T [auth A], U [auth A], V [auth A], W [auth A], X [auth A], Y [auth A], Z [auth A]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.221 
• R-Value Work: 0.178 
• R-Value Observed: 0.180 
• Space Group: P 4₃ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 116.77	α = 90
b = 116.77	β = 90
c = 220.04	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2014-08-20 
Deposition Author(s): Singh, A.K., Pluvinage, B., Higgins, M.A., Dalia, A.B., Flynn, M., Lloyd, A.R., Weiser, J.N., Stubbs, K.A., Boraston, A.B., King, S.J.

Revision History  

• Version 1.0: 2014-08-20
  Type: Initial release
  
• Version 1.1: 2014-09-24
  Changes: Database references