2J44

Alpha-glucan binding by a streptococcal virulence factor

• PDB DOI: https://doi.org/10.2210/pdb2J44/pdb

• Classification: CARBOHYDRATE-BINDING MODULE
• Organism(s): Streptococcus pneumoniae
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2006-08-24 Released: 2006-12-11 
• Deposition Author(s): Lammerts van Bueren, A., Higgins, M., Wang, D., Burke, R.D., Boraston, A.B.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.304 
• R-Value Work: 0.221 
• R-Value Observed: 0.225 

Biological Assembly 1  

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

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

Macromolecule Content

• Total Structure Weight: 26.72 kDa 
• Atom Count: 2,070 
• Modelled Residue Count: 217 
• Deposited Residue Count: 217 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ALKALINE AMYLOPULLULANASE	A	217	Streptococcus pneumoniae	Mutation(s): 0
UniProt
Find proteins for A0A0H2UNG0 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4)) Explore A0A0H2UNG0  Go to UniProtKB:  A0A0H2UNG0

Oligosaccharides

Help

Entity ID: 2
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose	B	3		N/A
Glycosylation Resources
GlyTouCan:  G96370VA GlyCosmos:  G96370VA GlyGen:  G96370VA

Entity ID: 3
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranose	C	4		N/A
Glycosylation Resources
GlyTouCan:  G87171PZ GlyCosmos:  G87171PZ GlyGen:  G87171PZ

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	D [auth A], E [auth A], F [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Biologically Interesting Molecules (External Reference) 2 Unique

Entity ID: 2
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_900009	B	alpha-maltotriose	Oligosaccharide / Nutrient

Entity ID: 3
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_900010	C	alpha-maltotetraose	Oligosaccharide / Substrate analog

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.10 Å
• R-Value Free: 0.304 
• R-Value Work: 0.221 
• R-Value Observed: 0.225 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 50.555	α = 90
b = 89.124	β = 90
c = 59.997	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
SPYD	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2006-12-11 
Deposition Author(s): Lammerts van Bueren, A., Higgins, M., Wang, D., Burke, R.D., Boraston, A.B.

Revision History  

• Version 1.0: 2006-12-11
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Atomic model, Data collection, Derived calculations, Other, Structure summary
• Version 2.1: 2023-12-13
  Changes: Data collection, Database references, Refinement description, Structure summary