Crystal structure of 7,8-diaminopelargonic acid synthase (BioA) from Mycobacterium tuberculosis, complexed with an inhibitor optimized from HTS lead

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.159 

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Ligand Structure Quality Assessment 

This is version 1.4 of the entry. See complete history


Structure-Based Optimization of Pyridoxal 5'-Phosphate-Dependent Transaminase Enzyme (BioA) Inhibitors that Target Biotin Biosynthesis in Mycobacterium tuberculosis.

Liu, F.Dawadi, S.Maize, K.M.Dai, R.Park, S.W.Schnappinger, D.Finzel, B.C.Aldrich, C.C.

(2017) J Med Chem 60: 5507-5520

  • DOI: https://doi.org/10.1021/acs.jmedchem.7b00189
  • Primary Citation of Related Structures:  
    4XJO, 4XJP, 5KGS, 5KGT

  • PubMed Abstract: 

    The pyridoxal 5'-phosphate (PLP)-dependent transaminase BioA catalyzes the second step in the biosynthesis of biotin in Mycobacterium tuberculosis (Mtb) and is an essential enzyme for bacterial survival and persistence in vivo. A promising BioA inhibitor 6 containing an N-aryl, N'-benzoylpiperazine scaffold was previously identified by target-based whole-cell screening. Here, we explore the structure-activity relationships (SAR) through the design, synthesis, and biological evaluation of a systematic series of analogues of the original hit using a structure-based drug design strategy, which was enabled by cocrystallization of several analogues with BioA. To confirm target engagement and discern analogues with off-target activity, each compound was evaluated against wild-type (WT) Mtb in biotin-free and -containing medium as well as BioA under- and overexpressing Mtb strains. Conformationally constrained derivative 36 emerged as the most potent analogue with a K D of 76 nM against BioA and a minimum inhibitory concentration of 1.7 μM (0.6 μg/mL) against Mtb in biotin-free medium.

  • Organizational Affiliation

    Department of Microbiology and Immunology, Weill Cornell Medical College , New York, New York 10065, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Adenosylmethionine-8-amino-7-oxononanoate aminotransferase
A, B
457Mycobacterium tuberculosis H37RvMutation(s): 0 
Gene Names: bioARv1568MTCY336.35c
Find proteins for P9WQ81 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WQ81 
Go to UniProtKB:  P9WQ81
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP9WQ81
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 41N

Download Ideal Coordinates CCD File 
D [auth A],
H [auth B]
C20 H20 N2 O4
Query on PLP

Download Ideal Coordinates CCD File 
C [auth A],
G [auth B]
C8 H10 N O6 P
Query on PEG

Download Ideal Coordinates CCD File 
F [auth A],
L [auth B]
C4 H10 O3
Query on EDO

Download Ideal Coordinates CCD File 
E [auth A],
I [auth B],
J [auth B],
K [auth B],
M [auth B]
C2 H6 O2
Binding Affinity Annotations 
IDSourceBinding Affinity
41N Binding MOAD:  4XJP Kd: 108 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.187 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.159 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.469α = 90
b = 65.92β = 90
c = 204.252γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-01-20
    Type: Initial release
  • Version 1.1: 2016-02-03
    Changes: Database references
  • Version 1.2: 2017-07-05
    Changes: Database references, Derived calculations
  • Version 1.3: 2018-10-10
    Changes: Data collection, Database references, Structure summary
  • Version 1.4: 2023-09-27
    Changes: Data collection, Database references, Refinement description, Structure summary