7el8

From Proteopedia

Crystal structure of Mycobacterium tuberculosis tryptophanyl-tRNA synthetase

Structural highlights

7el8 is a 1 chain structure with sequence from Mycobacterium tuberculosis. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.1Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

SYW_MYCTU

Publication Abstract from PubMed

Indolmycin (IND) is a microbial natural product that selectively inhibits bacterial tryptophanyl-tRNA synthetase (TrpRS). The tryptophan biosynthesis pathway was recently shown to be an important target for developing new antibacterial agents against Mycobacterium tuberculosis (Mtb). We investigated the antibacterial activity of IND against several mycobacterial model strains. A TrpRS biochemical assay was developed to analyze a library of synthetic IND analogues. The 4-methylated IND compound, Y-13, showed improved anti-Mtb activity with a minimum inhibitory concentration (MIC) of 1.88 muM ( approximately 0.5 mug/mL). The MIC increased significantly when overexpression of TrpRS was induced in the genetically engineered surrogate M. bovis BCG. The cocrystal structure of Mtb TrpRS complexed with IND and ATP has revealed that the amino acid pocket is in a state between the open form of apo protein and the closed complex with the reaction intermediate. In whole-cell-based experiments, we studied the combination effect of Y-13 paired with different antibacterial agents. We evaluated the killing kinetics, the frequency of resistance to INDs, and the mode of resistance of IND-resistant mycobacteria by genome sequencing. The synergistic interaction of Y-13 with the TrpE allosteric inhibitor, indole propionic acid, suggests that prospective IND analogues could shut down tryptophan biosynthesis and protein biosynthesis in pathogens, leading to a new class of antibiotics. Finally, we discuss a strategy to expand the genome mining of antibiotic-producing microbes specifically for antimycobacterial development.

Investigate Natural Product Indolmycin and the Synthetically Improved Analogue Toward Antimycobacterial Agents.,Yang Y, Xu Y, Yue Y, Wang H, Cui Y, Pan M, Zhang X, Zhang L, Li H, Xu M, Tang Y, Chen S ACS Chem Biol. 2022 Jan 21;17(1):39-53. doi: 10.1021/acschembio.1c00394. Epub, 2021 Dec 15. PMID:34908399^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Yang Y, Xu Y, Yue Y, Wang H, Cui Y, Pan M, Zhang X, Zhang L, Li H, Xu M, Tang Y, Chen S. Investigate Natural Product Indolmycin and the Synthetically Improved Analogue Toward Antimycobacterial Agents. ACS Chem Biol. 2022 Jan 21;17(1):39-53. PMID:34908399 doi:10.1021/acschembio.1c00394