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Functional elucidation of hypothetical proteins for their indispensable roles toward drug designing targets from Helicobacter pylori strain HPAG1.
Journal of Biomolecular Structure & Dynamics 2018 March
Helicobacter pylori is a flagellated and slow growing gram-negative bacterium that persistently infects about half of the entire world population. In present study, we examined the proteome of H. pylori strain HPAG1 for identification of key uncharacterized proteins toward their novel regulatory functions. The complete proteome of this strain consists of 1539 proteins, out of which 520 proteins are annotated as hypothetical. Based on the functional motifs in their primary sequences, we were able to classify 254 of these hypothetical proteins into 6 functional categories. Further, KEGG database was used to find the roles of these hypothetical proteins in several pathways and structural prediction was done by homology modeling methods. Thirty-three of these hypothetical proteins were found to have strong association in various pathways including signaling and defense mechanisms. We noted that 27 of these proteins are specific to H. pylori and can be selected for drug designing targets, based on their virulence and regulatory role. We were able to successfully model the 3D structures of three of these proteins: YP_626977.1, YP_626786.1, and YP_628146.1. The stability of these proteins was also validated using molecular dynamics simulations, and their possible role in the regulation of different pathways was explained. These novel annotations may contribute to the understanding of disease mechanism at molecular level and provide novel potential targets for designing new drugs against H. pylori strain HPAG1.
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