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Coexisting properties of thermostability and ultraviolet radiation resistance in the main S-layer complex of Deinococcus radiodurans

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Abstract

Deinococcus radiodurans is well known for its unusual resistance to different environmental stresses. Recently, we have described a novel complex composed of the surface (S)-layer protein DR_2577 and the carotenoid deinoxanthin. We also showed a role of this complex in the UV resistance under desiccation. Both these properties, UV and desiccation resistance, suggest a selective pressure generated by Sun irradiation. In order to confirm this hypothesis we checked whether this S-layer Deinoxanthin Binding Complex (SDBC) has features of thermo-resistance, a property also expected in proteins evolved under solar irradiative pressure. We performed the spectroscopic characterization of the SDBC by means of thermal shift assay, circular dichroism and related in silico analysis. Our findings identify a stability typical of thermo-adapted proteins and provide a new insight into the origin of specific S-layer types. The results are discussed in terms of co-evolutionary mechanisms related to Sun-induced desiccation and heat.

Graphical abstract: Coexisting properties of thermostability and ultraviolet radiation resistance in the main S-layer complex of Deinococcus radiodurans

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Publication details

The article was received on 28 Jun 2017, accepted on 24 Nov 2017 and first published on 27 Nov 2017


Article type: Paper
DOI: 10.1039/C7PP00240H
Citation: Photochem. Photobiol. Sci., 2018, Advance Article
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    Coexisting properties of thermostability and ultraviolet radiation resistance in the main S-layer complex of Deinococcus radiodurans

    D. Farci, C. Slavov and D. Piano, Photochem. Photobiol. Sci., 2018, Advance Article , DOI: 10.1039/C7PP00240H

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