Biological Assembly 1  

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

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

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

Macromolecule Content

• Total Structure Weight: 65.30 kDa 
• Atom Count: 4469 
• Modelled Residue Count: 578 
• Deposited Residue Count: 592 
• Unique protein chains: 1

1QAP

QUINOLINIC ACID PHOSPHORIBOSYLTRANSFERASE WITH BOUND QUINOLINIC ACID

• PDB DOI: 10.2210/pdb1QAP/pdb

• Classification: GLYCOSYLTRANSFERASE
• Organism(s): Salmonella enterica subsp. enterica serovar Typhimurium
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 1996-09-20 Released: 1997-03-12 
• Deposition Author(s): Eads, J.C., Ozturk, D., Wexler, T.B., Grubmeyer, C., Sacchettini, J.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.274 
• R-Value Work: 0.186 
• R-Value Observed: 0.186 

Literature

A new function for a common fold: the crystal structure of quinolinic acid phosphoribosyltransferase.

Eads, J.C., Ozturk, D., Wexler, T.B., Grubmeyer, C., Sacchettini, J.C.

(1997) Structure 5: 47-58

• PubMed: 9016724 
• DOI: 10.1016/s0969-2126(97)00165-2
• Primary Citation of Related Structures:  
  1QAP


• PubMed Abstract: 
  

Quinolinic acid (QA) is a neurotoxin and has been shown to be present at high levels in the central nervous system of patients with certain diseases, such as AIDS and meningitis. The enzyme quinolinic acid phosphoribosyltransferase (QAPRTase) provides the only route for QA metabolism and is also an essential step in de novo NAD biosynthesis. QAPRTase catalyzes the synthesis of nicotinic acid mononucleotide (NAMN) from QA and 5-phosphoribosyl-1-pyrophosphate (PRPP). The structures of several phosphoribosyltransferases (PRTases) have been reported, and all have shown a similar fold of a five-strandard beta sheet surrounded by four alpha helices. A conserved sequence motif of 13 residues is common to these 'type I' PRTases but is not observed in the QAPRTase sequence, suggestive of a different fold for this enzyme.

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Organizational Affiliation: 

Department of Biochemistry, Albert Einstein College of Medicine, Bronx, NY 10461, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
QUINOLINIC ACID PHOSPHORIBOSYLTRANSFERASE	A, B	296	Salmonella enterica subsp. enterica serovar Typhimurium	Mutation(s): 0  EC: 2.4.2.19
UniProt
Find proteins for P30012 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore P30012  Go to UniProtKB:  P30012

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NTM	C [auth A], D [auth B]	QUINOLINIC ACID C7 H5 N O4 GJAWHXHKYYXBSV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.274 
• R-Value Work: 0.186 
• R-Value Observed: 0.186 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 81.4	α = 90
b = 81.4	β = 90
c = 217.3	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
XENGEN	data reduction
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1996-09-20 
• Released Date: 1997-03-12 
Deposition Author(s): Eads, J.C., Ozturk, D., Wexler, T.B., Grubmeyer, C., Sacchettini, J.C.

Revision History  

• Version 1.0: 1997-03-12
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance