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Molecular interaction between human SUMO-I and histone like DNA binding protein of Helicobacter pylori (Hup) investigated by NMR and other biophysical tools.
International Journal of Biological Macromolecules 2018 November 13
The proteins secreted by bacteria contribute to immune mediated gastric inflammation and epithelial damage; thus aid bacterial invasion in host tissue, and may also interact with host proteins, conspirating a mechanism against host-immune system. The Histone-like DNA binding protein is one of the most abundant nucleoid-associated proteins in Helicobacter pylori (H. pylori). The protein -referred here as Hup- is also secreted in vitro by H. pylori, thus it may have its role in disease pathogenesis. This is possible only if Hup interact with some human proteins including Small-Ubiquitin-like-Modifier (SUMO) proteins. Studies have established that SUMO-proteins participate in various innate-immune pathways and thus promote an efficient immune response to combat pathogenic infections. Sequence analysis revealed the presence of two SUMO interacting motifs (SIMs) and several positively charged lysine residues on the protein surface of Hup. Additionally, SUMO-proteins epitomize negatively charged surface which confers them the ability to bind to DNA/RNA binding proteins. Based on the presence of SIMs as well as charge complementarity between the proteins, it is legitimate to consider that Hup protein would bind to SUMO-proteins. The present study has been undertaken to establish this interaction for the first time using NMR in combination with ITC and other biophysical techniques.
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