AUTHOR=Prasad Jay Kishor , Pandey Priyanka , Anand Richa , Raghuwanshi Richa 

TITLE=Drought Exposed Burkholderia seminalis JRBHU6 Exhibits Antimicrobial Potential Through Pyrazine-1,4-Dione Derivatives Targeting Multiple Bacterial and Fungal Proteins

JOURNAL=Frontiers in Microbiology

VOLUME=12

YEAR=2021

URL=https://www.frontiersin.org/journals/microbiology/articles/10.3389/fmicb.2021.633036

DOI=10.3389/fmicb.2021.633036

ISSN=1664-302X

ABSTRACT=<p>The present study aimed to explore the antimicrobial potentials of soil bacteria and identify the bioactive compounds and their likely targets through <italic>in silico</italic> studies. A total 53 bacterial isolates were screened for their antimicrobial potential of which the strain JRBHU6 showing highest antimicrobial activity was identified as <italic>Burkholderia seminalis</italic> (GenBank accession no. <ext-link ext-link-type="DDBJ/EMBL/GenBank" xlink:href="MK500868" xmlns:xlink="http://www.w3.org/1999/xlink">MK500868</ext-link>) based on 16S ribosomal RNA (rRNA) gene sequencing and phylogenetic analysis. <italic>B. seminalis</italic> JRBHU6 also produced hydrolytic enzymes chitinases and cellulase of significance in accrediting its antimicrobial nature. The bioactive metabolites produced by the isolate were extracted in different organic solvents among which methanolic extract showed best growth-suppressing activities toward multidrug resistant <italic>Staphylococcus aureus</italic> and fungal strains, <italic>viz Fusarium oxysporum</italic>, <italic>Aspergillus niger</italic>, <italic>Microsporum gypseum</italic>, <italic>Trichophyton mentagrophytes</italic>, and <italic>Trichoderma harzianum</italic>. The antimicrobial compounds were purified using silica gel thin layer chromatography and high-performance liquid chromatography (HPLC). On the basis of spectroscopic analysis, the bioactive metabolites were identified as pyrrolo(1,2-a)pyrazine-1,4-dione,hexahydro (PPDH) and pyrrolo(1,2-a)pyrazine-1,4-dione, hexahydro-3(2-methylpropyl) (PPDHMP). <italic>In silico</italic> molecular docking studies showed the bioactive compounds targeting fungal and bacterial proteins, among which PPDHMP was multitargeting in nature as reported for the first time through this study.</p>