Insight into multicopper oxidase laccase from ITCC-8447: a case study using in silico and experimental analysis.

["The oxidation activity of multicopper-oxidases overlaps with different substrates of laccases and bilirubin oxidases, thus in the present study an integrated approach of bioinformatics using homology modeling, docking, and experimental validation was used to confirm the type of multicopper-oxidase in ITCC-8447. The result of peptide sequence of ITCC-8447 enabled to predict the 3\u2009D-structure of multicopper-oxidase. It was overlapped with the structure of laccase and root mean square deviation (RMSD) was 1.53\u2009\u00c5 for 533 and, 171 residues. The low binding energy with azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) (-5.64) as compared to bilirubin (-4.39) suggested that ITCC-8447 have laccase-like activity. The experimental analysis confirmed high activity with laccase specific substrates, phenol (18.3\u2009U\/L), ampyrone (172.4\u2009U\/L) and, ampyrone phenol coupling (50\u2009U\/L) as compared to bilirubin oxidase substrate bilirubin (16.6\u2009U\/L). In addition, lowest binding energy with ABTS (-5.64), syringaldazine SYZ (-4.83), guaiacol GCL (-4.42), and 2,6-dimethoxyphenol DMP (-4.41) confirmed the presence of laccase. Further, complete remediation of two hazardous model pollutants i.e., phenol and resorcinol (1.5\u2009mM) after 12\u2009h of incubation and low binding energy of -4.32 and, -4.85 respectively confirmed its removal by laccase. The results confirmed the presence of laccase in ITCC-8447 and its effective bioremediation potential."]