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Rice plant diseases play a major role as biological constraints on production. One of such rice disease is bacterial leaf blight, caused by Xanthomonas oryzae pv. Oryzae (Xoo). The diffusible signal factor (DSF) synthesized by Xoo has a major role in virulence to rice plant. The DSF synthase RpfF protein, which is related to crotonase superfamily is responsible for the maintaining concentration of DSF. DSF-dependent quorum sensing (QS) system adopts protein- protein interaction mechanism to auto regulates the production of DSF. The antibacterial activity of pesticides against Xoo has not yet been completely understood. Three dimensional structure of RpfF protein was predicted using homology modeling method by MODELLER 9V9 software, SWISS MODEL and GENO3D online tools and structures were validated by Ramachandran plot, TM-Score and RMSD. 3D structure of RpfF (accession number AAL06345) was predicted using DSF synthase of Xanthomonas campestris pv. campestris (Xcc) (PDB ID: 3M6M) as a template. The stereo chemical check reveals the structure developed from the modeller was the best one and the potential ligand binding sites were identified by CASTp Server. The predicted RpfF model provides insight into its structure, active sites and aid in the development of novel inhibitors to control bacterial leaf blight in rice plant. DSF synthase RpfF protein could be used as a novel target to control infection.

In silico model of DSF synthase RpfF protein from Xanthomonas oryzae pv. Oryzae: A novel target for bacterial blight of rice disease