4CXQ image
Entry Detail
PDB ID:
4CXQ
Keywords:
Title:
Mycobaterium tuberculosis transaminase BioA complexed with substrate KAPA
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2014-04-08
Release Date:
2014-04-23
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.19
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:ADENOSYLMETHIONINE-8-AMINO-7-OXONONANOATE AMINOTRANSFERASE
Chain IDs:A, B
Chain Length:457
Number of Molecules:2
Biological Source:MYCOBACTERIUM TUBERCULOSIS
Primary Citation
Inhibition of Mycobacterium Tuberculosis Transaminase Bioa by Aryl Hydrazines and Hydrazides.
Chembiochem 15 575 ? (2014)
PMID: 24482078 DOI: 10.1002/CBIC.201300748

Abstact

7,8-Diaminopelargonic acid synthase (BioA) of Mycobacterium tuberculosis is a recently validated target for therapeutic intervention in the treatment of tuberculosis (TB). Using biophysical fragment screening and structural characterization of compounds, we have identified a potent aryl hydrazine inhibitor of BioA that reversibly modifies the pyridoxal-5'-phosphate (PLP) cofactor, forming a stable quinonoid. Analogous hydrazides also form covalent adducts that can be observed crystallographically but are incapable of inactivating the enzyme. In the X-ray crystal structures, small molecules induce unexpected conformational remodeling in the substrate binding site. We compared these conformational changes to those induced upon binding of the substrate (7-keto-8-aminopelargonic acid), and characterized the inhibition kinetics and the X-ray crystal structures of BioA with the hydrazine compound and analogues to unveil the mechanism of this reversible covalent modification.

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