4FGR

X-Ray Structure of SAICAR Synthetase (PurC) from Streptococcus pneumoniae complexed with ADP and Mg2+

• PDB DOI: https://doi.org/10.2210/pdb4FGR/pdb

• Classification: LIGASE
• Organism(s): Streptococcus pneumoniae
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2012-06-04 Released: 2013-06-05 
• Deposition Author(s): Fung, L.W.-M., Johnson, M.E., Abad-Zapatero, C., Wolf, N.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.319 
• R-Value Work: 0.231 
• R-Value Observed: 0.235 

Starting Model: experimental

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content

• Total Structure Weight: 59.47 kDa 
• Atom Count: 4,025 
• Modelled Residue Count: 468 
• Deposited Residue Count: 510 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Phosphoribosylaminoimidazole-succinocarboxamide synthase	A, B	255	Streptococcus pneumoniae	Mutation(s): 0  Gene Names: purC, SP_0044 EC: 6.3.2.6
UniProt
Find proteins for Q07296 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4)) Explore Q07296  Go to UniProtKB:  Q07296

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ADP	D [auth A], H [auth B]	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N
ACT	F [auth A], I [auth B]	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M
CL	E [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M
MG	C [auth A], G [auth B]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.319 
• R-Value Work: 0.231 
• R-Value Observed: 0.235 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 45.931	α = 90
b = 65.111	β = 91.96
c = 85.837	γ = 90

Software Package:

Software Name	Purpose
ADSC	data collection
MOLREP	phasing
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2013-06-05 
Deposition Author(s): Fung, L.W.-M., Johnson, M.E., Abad-Zapatero, C., Wolf, N.W.

Revision History  

• Version 1.0: 2013-06-05
  Type: Initial release
  
• Version 1.1: 2023-09-13
  Changes: Data collection, Database references, Derived calculations, Refinement description