Phytochemical Composition and Insight into Antibacterial Potential of Origanum vulgare Essential Oil from Saudi Arabia Using In Vitro and In Silico Approaches

Abstract

In Saudi Arabia, Origanum vulgare is widely disseminated. In the present work, we used GC-MS analysis to identify the components of Origanum vulgare essential oil. The disc diffusion assay was used to assess the essential oil’s in vitro antibacterial efficacy against Gram-positive and Gramnegative Staphylococcus aureus and Escherichia coli. The antimicrobial efficacy against many microbial proteins, including tyrosyl-tRNA synthetase (TyrRS), DNA gyrase, and dihydrofolate reductase (DHFR), was further evaluated using molecular docking. Eighteen compounds were identified using GC-MS analysis, which constituted 99.81% of the total essential oil content. Terpinen-4-ol (34.3%), Beta-Terpineol (16.96%), 3-Epimoretenol (11.84%), and Alpha-Terpineol (3.86%) were the main substances identified. According to the antibacterial investigation, the inhibition zone against Staphylococcus aureus was 8 mm and 6 mm against Escherichia coli. High affinities were found between 3-Epimoretenol and tyrosyl-tRNA synthetase (TyrRS) and dihydrofolate reductase (DHFR) compared to positive controls (Clorobiocin, SCHEMBL2181345); the affinity values were −8.3 Kcal/mol and −9.2, respectively. The results of the present study indicate that Origanum vulgare essential oil can be used as a nutraceutical to treat infectious diseases.