Interaction-induced structural transformation of lysozyme and kappa-carrageenan in binary complexes.

O N Makshakova, L R Bogdanova, D A Faizullin, E A Ermakova, Yu F Zuev, I A Sedov

Carbohydrate polymers 2021 Jan 15

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The interactions between κ-carrageenan and hen egg-white lysozyme have been studied. In dilute solutions, the insoluble complexes with constant κ-carrageenan/lysozyme ratio of 0.3, or 12 disaccharide units per mole of protein are formed. FTIR-spectroscopy revealed that κ-carrageenan retains its unordered conformation and induces the rise of β-structure in lysozyme. In the complexes formed in concentrated mixtures, κ-carrageenan adopts helical conformation and lysozyme retains its native-like structure. These complexes contain 21 disaccharide units per mole of protein. Molecular modeling showed that flexible coil and rigid double helix of κ-carrageenan have different binding patterns to lysozyme surface. The latter has a strong preference to positively charged spots in lysozyme α-domain while the former also interacts to protein β-domain and stabilizes short-living β-structures. The obtained results confirm the preference of unordered κ-carrageenan to β-structure rich protein regions, which can be further used in the development of carrageenan-based protection of amyloid-like aggregation of proteins. Copyright © 2020 Elsevier Ltd. All rights reserved.

Citation

O N Makshakova, L R Bogdanova, D A Faizullin, E A Ermakova, Yu F Zuev, I A Sedov. Interaction-induced structural transformation of lysozyme and kappa-carrageenan in binary complexes. Carbohydrate polymers. 2021 Jan 15;252:117181