Abstract：
:To understand the effect of counter ions (Na+) on the secondary conformation and functionality of the lysozyme, we have studied the interaction of lysozyme with counterion associated iron oxide nanoparticles (IONPs). The investigation was carried out at pH 7.4 and 9.0, with three different types of NPs, namely, bare IONPs, low molecular weight chitosan modified IONPs (LMWC-IONPs) and the counterion (Na+) associated sodium tripolyphosphate IONPs (STP-LMWC-IONPs) and confirmed by using various spectroscopy techniques. The difference in UV-vis absorbance (ΔA) between native and STP-LMWC-IONPs interacted hen egg white lysozyme (HEWL) was greater than that between native and NPs interacted HEWL at pH 9.0 compared with pH 7.4. Furthermore, STP-LMWC-IONPs exhibited quenching effect on lysozyme fluorescence spectrum at pH 9.0 due to binding of Na+ counterions to the protein, confirming denaturation of the latter. After HEWL interaction with STP-LMWC-IONPs (pH 9.0), CD spectra revealed a conformational change in the secondary structure of HEWL. Also, counterion induced lysozyme inactivation, due to interaction with nanoparticles at pH 9.0, was confirmed by enzymatic activity assay involving lysis of Micrococcus lysodeikticus. In conclusion, pH 9.0 was observed to be a more favorable condition, compared to pH 7.4, for the strongest electrostatic interaction between lysozyme and NPs. We postulate that the counterions in nanoparticle surface-coating can ameliorate protein misfolding or unfolding and also prevent their aggregation and, therefore, can be considered as a powerful and potential therapeutic strategy to treat incurable neurodegenerative disorders.
journal_name
Bioorg Chemjournal_title
Bioorganic chemistryauthors
Dyawanapelly S,Mehrotra P,Ghosh G,Jagtap DD,Dandekar P,Jain Rdoi
10.1016/j.bioorg.2018.09.020subject
Has Abstractpub_date
2019-02-01 00:00:00pages
17-25eissn
0045-2068issn
1090-2120pii
S0045-2068(18)30759-4journal_volume
82pub_type
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更新日期：2020-06-01 00:00:00
