Abstract
The furin (FR) complex with each of four different sequences of hemagglutinin from the highly pathogenic H5N1 strains (HPH5), which were identified during the 2004–2010 influenza outbreaks in Thailand, were evaluated by molecular dynamics simulations, so as to compare the specificity and recognition of the enzyme–substrate binding. Relative to the conventional HPH5 inserted (H5Sq1, RERRRKKR), the S5-R or S6-R arginine residue is replaced by the smaller lysine in the H5Sq2 (RERKRKKR) and H5Sq3 (REKRRKKR) strains, respectively, whereas the S3-K lysine residue is deleted in H5Sq4 (RERRR_KR). The molecular dynamics results of the intermolecular interactions, in terms of hydrogen bonds and per-residue decomposition energy, between the substrate and furin revealed that the deletion of the positively charged amino acid at the S3 position in H5Sq4 leads to a notably weaker binding and specificity with the furin active site compared with that of FR–H5Sq1. A slight change in the substrate binding was found in the FR–H5Sq2 and FR–H5Sq3 complexes as a result of the replacement of the arginine with the shorter side-chained lysine (same positive charge). Altogether, the predicted binding free energy of the enzyme–substrate complexes was found to be in the following order: FR–H5Sq1 < FR–H5Sq2 ~ FR–H5Sq3 ≪ FR–H5Sq4.
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Acknowledgments
This work was supported by the National Research University Project of CHE and Ratchadaphiseksomphot Endowment Fund (HR1155A) and the Thai Government Stimulus Package 2 (TKK2555), under the Project for Establishment of Comprehensive Center for Innovative Food, Health Products and Agriculture. P.K. and P.Y. are grateful for the postdoctoral fellowship from the Ratchadaphiseksomphot Endowment Fund from Chulalongkorn University. P.K. acknowledges the funding for New Research from the Thailand Research Fund. The authors would like to thank the Computational Chemistry Unit Cell, Faculty of Science, Chulalongkorn University, and the Institute of Theoretical Chemistry, University of Vienna, for providing research facilities, software packages, and computing times. The Center of Excellence for Petroleum, Petrochemicals and Advanced Materials, Chulalongkorn University, is acknowledged.
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Kongsune, P., Rungrotmongkol, T., Nunthaboot, N. et al. Molecular insights into the binding affinity and specificity of the hemagglutinin cleavage loop from four highly pathogenic H5N1 isolates towards the proprotein convertase furin. Monatsh Chem 143, 853–860 (2012). https://doi.org/10.1007/s00706-011-0690-4
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DOI: https://doi.org/10.1007/s00706-011-0690-4