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Preferential adsorption to air-water interfaces: a novel cryoprotective mechanism for LEA proteins

Yuen, Fanny, Watson, Matthew, Barker, Robert D, Grillo, Isabelle, Heenan, Richard K., Tunnacliffe, Alan, Routh, Alexander F. (2019) Preferential adsorption to air-water interfaces: a novel cryoprotective mechanism for LEA proteins. Biochemical Journal, 476 (7). pp. 1121-1135. ISSN 0264-6021. (doi:10.1042/BCJ20180901) (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided)

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Abstract

Late embryogenesis abundant (LEA) proteins comprise a diverse family whose members play a key role in abiotic stress tolerance. As intrinsically disordered proteins, LEA proteins are highly hydrophilic and inherently stress tolerant. They have been shown to stabilize multiple client proteins under a variety of stresses, but current hypotheses do not fully explain how such broad range stabilization is achieved. Here, using neutron reflection and surface tension experiments, we examine in detail the mechanism by which model LEA proteins, AavLEA1 and ERD10, protect the enzyme citrate synthase from aggregation during freeze-thaw. We find that a major contributing factor to citrate synthase aggregation is the formation of air bubbles during the freeze-thaw process. This greatly increases the air-water interfacial area, which is known to be detrimental to folded protein stability. Both model LEA proteins preferentially adsorb to this interface and compete with citrate synthase, thereby reducing surface induced aggregation. This novel surface activity provides a general mechanism by which diverse members of the LEA protein family might function to provide aggregation protection that is not specific to the client protein.

Item Type: Article
DOI/Identification number: 10.1042/BCJ20180901
Uncontrolled keywords: freeze-thaw; stress tolerance; anhydrobiosis; neutron reflection; protein aggregation
Subjects: Q Science
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Robert Barker
Date Deposited: 21 Mar 2019 11:36 UTC
Last Modified: 23 Jan 2020 04:16 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/73112 (The current URI for this page, for reference purposes)
Barker, Robert D: https://orcid.org/0000-0002-8645-5385
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