salicifolia needs to be evaluated in animal models to determine its potential as natural health care product. All authors have none to declare. The authors would like to acknowledge the working team in the Department of Pharmacology at the National Research Centre for their assistance concerning the biological activity. Screening Library cell line Also a lot of thanks go to Dr. Maha G. Haggag, lecturer of Microbiology, Research Institute of Ophthalmology, for her assistance concerning the antibacterial activity. “
“An enzyme tyrosinase (EC 1.14.18.1) harbors the monophenol hydroxylase and diphenol oxidase activities which is required

for the melanin pigments. It was reported to be prevalent widely in nature, and identified in Hamster melanoma,1 mouse melanoma,2 mouse skin,3 human skin,4 potato tuber,5 broad bean,6 mushroom.7 Tyrosinase acts as defensive agent against UV light by production of melanin in human and bacterial species.8 Bacterial tyrosinase activity was investigated by crystallizing

and determining the three dimensional structure of the protein of Bacillus megaterium. 9 Tyrosinase brings about oxidation of tyrosine to melanin through l-3,4-dihydroxyphenylalanine (l-DOPA) and dopaquinone. Dopaquinone is a neurotransmitter and its deficiency leads to Parkinson’s in human. PF-01367338 price The Homo sapiens

tyrosinase enzyme mechanism of complicated hydroxylation in active site was not understood completely, as tertiary structure is not available till date. One important reason for such deficit is that eukaryotic tyrosinase was not purified in sufficient quantity to crystallize. While, this is not the case in prokaryotic tyrosinase, as intensive research and characterization have been done. 10 In order to investigate the potent tyrosinase inhibitor which could be used in melanin treatment therapy, we have performed docking study with bacterial tyrosinase as a model and docking data was Mephenoxalone reported as per QSAR, which could be useful in drug study. As human tyrosinase three dimensional structure is not available, the selection of bacterial tyrosinase was done in Protein Data Bank. The three dimensional structure of tyrosinase of B. megaterium with protein polypeptide chain A and B along with ligands of copper ions and sodium dodecyl sulfate was retrieved from the RCSB Protein Data Bank. The web address is http://www.rcsb.org/pdb/explore/explore.do?structureId=4D87. In total, 5 drugs were designed using the Chem Draw ultra 6.0 and 3D structure was energy minimized by MM2 energy optimization program by Chem3D software. The drug docking parameters were set in using the software AutoDock 4.2 version 4.2.5.