3TFT

Crystal structure of 7,8-diaminopelargonic acid synthase (BioA) from Mycobacterium tuberculosis, pre-reaction complex with a 3,6-dihydropyrid-2-one heterocycle inhibitor

• PDB DOI: https://doi.org/10.2210/pdb3TFT/pdb

• Classification: TRANSFERASE
• Organism(s): Mycobacterium tuberculosis
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2011-08-16 Released: 2011-10-19 
• Deposition Author(s): Geders, T.W., Finzel, B.C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 0.197 
• R-Value Work: 0.156 
• R-Value Observed: 0.158 

Starting Model: experimental

Literature

Mechanism-based Inactivation by Aromatization of the Transaminase BioA Involved in Biotin Biosynthesis in Mycobaterium tuberculosis.

Shi, C., Geders, T.W., Park, S.W., Wilson, D.J., Boshoff, H.I., Abayomi, O., Barry, C.E., Schnappinger, D., Finzel, B.C., Aldrich, C.C.

(2011) J Am Chem Soc 133: 18194-18201

• PubMed: 21988601 
• DOI: https://doi.org/10.1021/ja204036t
• Primary Citation of Related Structures:  
  3TFT, 3TFU


• PubMed Abstract: 
  

  BioA catalyzes the second step of biotin biosynthesis, and this enzyme represents a potential target to develop new antitubercular agents. Herein we report the design, synthesis, and biochemical characterization of a mechanism-based inhibitor (1) featuring a 3,6-dihydropyrid-2-one heterocycle that covalently modifies the pyridoxal 5'-phosphate (PLP) cofactor of BioA through aromatization. The structure of the PLP adduct was confirmed by MS/MS and X-ray crystallography at 1.94 Å resolution. Inactivation of BioA by 1 was time- and concentration-dependent and protected by substrate. We used a conditional knock-down mutant of M. tuberculosis to demonstrate the antitubercular activity of 1 correlated with BioA expression, and these results provide support for the designed mechanism of action.

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Organizational Affiliation: 

Academic Health Center, University of Minnesota, Minnesota 55455, United States.

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: 97.65 kDa 
• Atom Count: 7,239 
• Modelled Residue Count: 846 
• Deposited Residue Count: 914 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Adenosylmethionine-8-amino-7-oxononanoate aminotransferase	A, B	457	Mycobacterium tuberculosis	Mutation(s): 0  Gene Names: bioA, MT1619, MTCY336.35c, Rv1568 EC: 2.6.1.62
UniProt
Find proteins for P9WQ81 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)) Explore P9WQ81  Go to UniProtKB:  P9WQ81

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PLP	C [auth A], E [auth B]	PYRIDOXAL-5'-PHOSPHATE C8 H10 N O6 P NGVDGCNFYWLIFO-UHFFFAOYSA-N
DMS	D [auth A]	DIMETHYL SULFOXIDE C2 H6 O S IAZDPXIOMUYVGZ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 0.197 
• R-Value Work: 0.156 
• R-Value Observed: 0.158 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 63.057	α = 90
b = 66.385	β = 90
c = 203.13	γ = 90

Software Package:

Software Name	Purpose
d*TREK	data scaling
d*TREK	data reduction
PHASER	phasing
PHENIX	refinement
PDB_EXTRACT	data extraction
Blu-Ice	data collection

Structure Validation

Entry History 

Deposition Data

• Released Date: 2011-10-19 
Deposition Author(s): Geders, T.W., Finzel, B.C.

Revision History  

• Version 1.0: 2011-10-19
  Type: Initial release
  
• Version 1.1: 2011-11-23
  Changes: Database references
• Version 1.2: 2023-09-13
  Changes: Data collection, Database references, Derived calculations, Refinement description