Abstract

ANTIBACTERIAL ACTIVITY OF BLACK AND GREEN TEA EXTRACTS AGAINST MULTIDRUG RESISTANCE SHIGELLA SONNEI AND SHIGELLA FLEXNERI: AN INTEGRATED EXPERIMENTAL STUDY AND COMPUTATIONAL APPROACH

Md. Eram Hosen, Faria Tasnim, Meherun Nesa, Md. Sojiur Rahman, Md. Faruk Hasan and Rashed Zaman*

ABSTRACT

Shigella spp. is well known for shigellosis in humans. Growing resistance pattern of Shigella spp. to different antibiotics is increasing global public health concerns. This study has been conducted to evaluate the antibiotics sensitivity of Shigella sonnei and Shigella flexneri, the antibacterial activity of methanol extract of black tea (BT) and green tea (GT), and the docking study was performed using 28 phytochemicals from Camellia sinensis with Shigella effector protein kinase OspG (4BVU) as well as in silico drug-likeness and ADME properties were also studied. Both S. sonnei and S. flexneri exhibited diverse antibiotics resistance patterns. Interestingly, methanol extract of GT showed higher antibacterial activity than BT extract against both bacteria. In addition, the docking study exposed 50% phytocompounds from Camellia sinensis which have strong inhibitory activity against 4BVU compared to control ciprofloxacin with binding energy of more than -7.40 kcal/mol. The highest binding affinity -9.70 kcal/mol was found by theaflavin with 21 interacting amino acid residues from 4BVU. However, drug-likeness and ADME properties showed Lipinski’s violation of our top binding ligand theaflavin, whereas 2nd and 3rd highest binding compounds theaflavic acid and theaflagallin showed violation with one parameter in H-bond donor. Therefore, present observation suggests Camellia sinensis may have the inhibitory activity against S. sonnei and S. flexneri, and phytocompunds theaflavic acid and theaflagallin could be used as effective drug candidates against Shigella spp.

Keywords: Shigellosis, Camellia sinensis, Antibacterial activity, Shigella effector protein kinase OspG, Molecular docking.