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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Jul 2022, 43 (4)                                     Back

nstantaneous and historical temperature effects on a-pinene

Evaluation of diflunisal a difluoro-derivative of salicylic acid as an inhibitor of human serum albumin using molecular docking tools


A.D. Stephen1*, S.M. Shankar2, R.N. Devi3, S. Maruthamuthu2, A.M. Musthafa4, M. Pannipara5 and A.G. Al-Sehemi5

1Department of Physics, PSG College of Arts and Science, Coimbatore-641 014, India

2Department of Physics, PSG Institute of Technology and Applied Research, Coimbatore-641 062, India

3Department of Physics, Fatima college, Madurai-625 001, India

4Department of General Studies (Physics Group), Jubail University College (Male Branch), Royal Commission of Jubail, 31961, Kingdom of Saudi Arabia

5Research Center for Advanced Materials Science, King Khalid University, Abha, 62529, Saudi Arabia

*Corresponding Author Email :


Received: 08.07.2021                                                                                               Revised: 25.10.2021                                                                                      Accepted: 17.02.2022




Aim: To evaluate the binding interaction of diflunisal at active site of Human Serum Albumin (HSA), an important enzyme responsible for osteoarthritis disease.

Methodology: The gas phase molecule was optimized with B3LYP/6-311G** basis set, while a single point energy calculation was carried out for the molecule lifted from the active site. Bader’s theory of atoms in molecules (AIM) was used to determine the electron density and Laplacian of electron density. The protein was assigned with polar hydrogens and Kollman charges. Iterated local search procedure was performed during docking, during this, both protein and ligand were considered as rigid. Among the ten poses, lowest binding energy pose was considered for further ligand protein interaction analysis and QTAIM studies.

Results: A close observation of the results shows that diflunisal has interactions in the binding sites IIA and IIIA of HSA as reported earlier. Two strong classical H-bonding interactions, three hydrophobic contacts with the amino acids VAL456, ALA194 andARG197, two close fluorine interactions, and two Pi-Sigma interactions have been observed. Apart from the H-bond interactions, the stability of HAS-Diflunisal complex was further empathized by five hyrdrophobic interactions framed between hydroxyl benzoic acid ring with ALA194, GLN459 and ARG197amino acid residue and difluorobenzene ring with ALA194 and VAL456.

Interpretation: The results of drug-likeness study showed that diflunisal is highly reactive and less toxic.

Key words: Binding affinity, Diflunisal, Human Serum Albumin, Inflammation, Molecular docking, Pain




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