Abstract
•New arylhydrazothiazolylsulfonamide derivatives 3(a-e) have been synthesized, designed and spectral characterized.•3d displayed more potent antimicrobial activity than the antibiotics•DFT, molecular docking and dynamics simulation were performed to explore detailed binding process•Computational approach supported the in vitro results
To find out effective new antibacterial agents, a series of novel aryl-hydrazothiazolyl-sulfonamide derivatives 3a-e were synthesized and well characterized by analytical and spectroscopic techniques. All the compounds were evaluated for their antibacterial and antifungal potential and the results showed excellent antimicrobial activity of 3d against all strains, especially B. cereus (MIC = 5.54 μM vs. 17.6 μM), P. aeruginosa (MIC = 7.3 μM vs.12.8 μM), E. coli (MIC = 6.4 μM vs. 21.3 μM) and C. albicans (MIC = 6.8 μM vs. 26.4 μM) in comparison to the commercial antibiotics, tetracycline and amphotericin B, respectively. The others analogues dispalyed potent to moderate antimicrobial activity. Structure-activity relationships (SARs) provides specially that incorporation of pyrimidin-2-ylsulfamoyl group at the para-phenyl position (3d) is good contributor for improving the antimicrobial activity. Further, Density Functional Theory (DFT) on 3d revealed its high stability and strongest electron-donating capability. Molecular docking and dynamic simulation studies on 3d inside the active site of S. aureus tyrosyl-tRNA synthetase (PDB ID: 1JIJ), E. coli dihydropteroate synthetase (PDB ID: 1AJ0), C. albicans dihydropteroate synthetase (PDB ID: 4HOE), and C. albicans N-myristoyl transferase (PDB ID: 1IYL) showed good binding profiles with the targets proteins, in particular with 1IYL and 4HOE receptors via the involvement of hydrogen bonding and that the formed complexes were thermodynamically highly stable. Taken together, our results make 3d as a promising lead for further drugs development.
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