Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 47.25 kDa 
• Atom Count: 3433 
• Modelled Residue Count: 404 
• Deposited Residue Count: 428 
• Unique protein chains: 1

1JBV

FPGS-AMPPCP complex

• PDB DOI: 10.2210/pdb1JBV/pdb

• Classification: LIGASE
• Organism(s): Lacticaseibacillus casei
• Expression System: Escherichia coli BL21
• Mutation(s): Yes 


• Deposited: 2001-06-06 Released: 2001-09-19 
• Deposition Author(s): Sun, X., Cross, J.A., Bognar, A.L., Baker, E.N., Smith, C.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 0.237 
• R-Value Work: 0.194 

Literature

Folate-binding triggers the activation of folylpolyglutamate synthetase.

Sun, X., Cross, J.A., Bognar, A.L., Baker, E.N., Smith, C.A.

(2001) J Mol Biol 310: 1067-1078

• PubMed: 11501996 
• DOI: 10.1006/jmbi.2001.4815
• Primary Citation of Related Structures:  
  1JBV, 1JBW


• PubMed Abstract: 
  

Folic acid is an essential vitamin for normal cell growth, primarily through its central role in one-carbon metabolism. Folate analogs (antifolates) are targeted at the same reactions and are widely used as therapeutic drugs for cancer and bacterial infections. Effective retention of folates in cells and the efficacy of antifolate drugs both depend upon the addition of a polyglutamate tail to the folate or antifolate molecule by the enzyme folylpolyglutamate synthetase (FPGS). The reaction mechanism involves the ATP-dependent activation of the free carboxylate group on the folate molecule to give an acyl phosphate intermediate, followed by attack by the incoming L-glutamate substrate. FPGS shares a number of structural and mechanistic details with the bacterial cell wall ligases MurD, MurE and MurF, and these enzymes, along with FPGS, form a subfamily of the ADP-forming amide bond ligase family. High-resolution crystallographic analyses of binary and ternary complexes of Lactobacillus casei FPGS reveal that binding of the first substrate (ATP) is not sufficient to generate an active enzyme. However, binding of folate as the second substrate triggers a large conformational change that activates FPGS and allows the enzyme to adopt a form that is then able to bind the third substrate, L-glutamate, and effect the addition of a polyglutamate tail to the folate.

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Organizational Affiliation: 

School of Biological Sciences, University of Auckland, New Zealand.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
FOLYLPOLYGLUTAMATE SYNTHASE	A	428	Lacticaseibacillus casei	Mutation(s): 1  Gene Names: fpgS EC: 6.3.2.17
UniProt
Find proteins for P15925 (Lactobacillus casei) Explore P15925  Go to UniProtKB:  P15925

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ACP	D [auth A]	PHOSPHOMETHYLPHOSPHONIC ACID ADENYLATE ESTER C11 H18 N5 O12 P3 UFZTZBNSLXELAL-IOSLPCCCSA-N
MG	B [auth A], C [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
KCX	A	L-PEPTIDE LINKING	C7 H14 N2 O4		LYS

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 0.237 
• R-Value Work: 0.194 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 53.1	α = 90
b = 45	β = 107.1
c = 84.3	γ = 90

Software Package:

Software Name	Purpose
AMoRE	phasing
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-06-06 
• Released Date: 2001-09-19 
Deposition Author(s): Sun, X., Cross, J.A., Bognar, A.L., Baker, E.N., Smith, C.A.

Revision History  

• Version 1.0: 2001-09-19
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance