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Biological Membranes in Extreme Conditions: Anionic Tetraether Lipid Membranes and Their Interactions with Sodium and Potassium
Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences. (Computational Chemistry and Biochemistry (CCBG) ; LNUC Biomaterials Chemistry)
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. (Centre for Ecology and Evolution in Microbial model Systems (EEMiS))ORCID iD: 0000-0002-9622-3318
Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences. (Computational Chemistry and Biochemistry (CCBG) ; LNUC Biomaterials Chemistry)ORCID iD: 0000-0001-8696-3104
2016 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 120, no 41, p. 10628-10634Article in journal (Refereed) Published
Abstract [en]

Archaea such as Sulfolobus acidocaldarius tolerate extreme temperatures and high acidity and can grow in the presence of toxic metals and low concentrations of Na+ or K+. It is believed that their unique tetraether membranes protect them from harsh environments and allow their survival under such conditions. We used molecular dynamics simulations to study membranes comprising glycerol dialkylnonitol tetraether lipids, which are the main component of S. acidocaldariusmembranes, in solutions containing different concentrations of NaCl and KCl or with Na+ or K+counterions (trace cations, 0 M). Anionic binding sites on the membranes were almost 50% occupied in the presence of counterions. The free energy of cation–phosphate complexation and the residence times of ions near the membranes were found to be both ion- and concentration-dependent. Sodium ions had more favorable interactions with the membranes and a longer residence time, whereas higher cation concentrations led to shorter ion residence times. When only counterions were present in the solutions, large residence times suggested that the membrane may function as a cation-attracting reservoir. The results suggested that the ions can be easily transferred to the cytoplasm as needed, explaining the growth curves of S. acidocaldarius under different salinities and pH.

Place, publisher, year, edition, pages
2016. Vol. 120, no 41, p. 10628-10634
National Category
Theoretical Chemistry Physical Chemistry
Research subject
Chemistry, Physical Chemistry
Identifiers
URN: urn:nbn:se:lnu:diva-57493DOI: 10.1021/acs.jpcb.6b06206ISI: 000386107500002Scopus ID: 2-s2.0-84992197879OAI: oai:DiVA.org:lnu-57493DiVA, id: diva2:1038867
Funder
Carl Tryggers foundation , 11:146Carl Tryggers foundation , 12:140Swedish National Infrastructure for Computing (SNIC)Available from: 2016-10-20 Created: 2016-10-20 Last updated: 2017-11-29Bibliographically approved

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Pineda De Castro, Luis FelipeDopson, MarkFriedman, Ran

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Pineda De Castro, Luis FelipeDopson, MarkFriedman, Ran
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