Compositional heterogeneity confers selective advantage to model protocellular membranes during the origins of cellular life

被引:27
作者
Sarkar, Susovan [1 ]
Dagar, Shikha [1 ]
Verma, Ajay [1 ]
Rajamani, Sudha [1 ]
机构
[1] Indian Inst Sci Educ & Res, Dept Biol, Pune 411008, Maharashtra, India
关键词
MONOCARBOXYLIC ACIDS; VESICLES; MAGNESIUM; STABILITY; EVOLUTION; ALCOHOLS; IONS;
D O I
10.1038/s41598-020-61372-w
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Protocellular membranes are thought to be composed of mixtures of single chain amphiphiles, such as fatty acids and their derivatives, moieties that would have been part of the complex prebiotic chemical landscape. The composition and physico-chemical properties of these prebiological membranes would have been significantly affected and regulated by their environment. In this study, pertinent properties were systematically characterized, under early Earth conditions. Two different fatty acids were mixed with their respective alcohol and/or glycerol monoester derivatives to generate combinations of binary and tertiary membrane systems. Their properties were then evaluated as a function of multiple factors including their stability under varying pH, varying Mg2+ ion concentrations, dilution regimes, and their permeability to calcein. Our results demonstrate how environmental constraints would have acted as important prebiotic selection pressures to shape the evolution of prebiological membranes. The study also illustrates that compositionally diverse membrane systems are more stable and robust to multiple selection pressures, thereby making them more suitable for supporting protocellular life.
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页数:11
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