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: 46.85 kDa 
• Atom Count: 3167 
• Modelled Residue Count: 393 
• Deposited Residue Count: 428 
• Unique protein chains: 1

1FGS

FOLYLPOLYGLUTAMATE SYNTHETASE FROM LACTOBACILLUS CASEI

• PDB DOI: 10.2210/pdb1FGS/pdb

• Classification: SYNTHETASE
• Organism(s): Lacticaseibacillus casei
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1998-04-29 Released: 1999-05-04 
• Deposition Author(s): Sun, X., Bognar, A., Baker, E., Smith, C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å

Literature

Structural homologies with ATP- and folate-binding enzymes in the crystal structure of folylpolyglutamate synthetase.

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

(1998) Proc Natl Acad Sci U S A 95: 6647-6652

• PubMed: 9618466 
• DOI: 10.1073/pnas.95.12.6647
• Primary Citation of Related Structures:  
  1FGS


• PubMed Abstract: 
  

Folylpolyglutamate synthetase, which is responsible for the addition of a polyglutamate tail to folate and folate derivatives, is an ATP-dependent enzyme isolated from eukaryotic and bacterial sources, where it plays a key role in the retention of the intracellular folate pool. Here, we report the 2.4-A resolution crystal structure of the MgATP complex of the enzyme from Lactobacillus casei. The structural analysis reveals that folylpolyglutamate synthetase is a modular protein consisting of two domains, one with a typical mononucleotide-binding fold and the other strikingly similar to the folate-binding enzyme dihydrofolate reductase. We have located the active site of the enzyme in a large interdomain cleft adjacent to an ATP-binding P-loop motif. Opposite this site, in the C domain, a cavity likely to be the folate binding site has been identified, and inspection of this cavity and the surrounding protein structure suggests that the glutamate tail of the substrate may project into the active site. A further feature of the structure is a well defined Omega loop, which contributes both to the active site and to interdomain interactions. The determination of the structure of this enzyme represents the first step toward the elucidation of the molecular mechanism of polyglutamylation of folates and antifolates.

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Organizational Affiliation: 

Department of Biochemistry, Massey University, Palmerston North, New Zealand.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
FOLYLPOLYGLUTAMATE SYNTHETASE	A	428	Lacticaseibacillus casei	Mutation(s): 0  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
POP	C [auth A]	PYROPHOSPHATE 2- H2 O7 P2 XPPKVPWEQAFLFU-UHFFFAOYSA-L
MG	B [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 54	α = 90
b = 46.1	β = 107.3
c = 84.9	γ = 90

Software Package:

Software Name	Purpose
MLPHARE	phasing
TNT	refinement
DENZO	data reduction
AGROVATA	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-04-29 
• Released Date: 1999-05-04 
Deposition Author(s): Sun, X., Bognar, A., Baker, E., Smith, C.

Revision History  

• Version 1.0: 1999-05-04
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance