文章基本信息

标题：An embryo of protocells: The capsule of graphene with selective ion channels
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作者：Zhan Li ; Chunmei Wang ; Longlong Tian 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
期号：1
DOI：10.1038/srep10258
语种：English
出版社：Springer Nature
摘要：The synthesis of artificial cell is a route for searching the origin of protocell. Here, we create a novel cell model of graphene capsules with selective ion channels, indicating that graphene might be an embryo of protocell membrane. Firstly, we found that the highly oxidized graphene and phospholipid-graphene oxide composite would curl into capsules under a strongly acidic saturated solution of heavy metallic salt solution at low temperature. Secondly, L-amino acids exhibited higher reactivity than D-amino acids on graphene oxides to form peptides, and the formed peptides in the influence of graphene would be transformed into a secondary structure, promoting the formation of left-handed proteins. Lastly, monolayer nanoporous graphene, prepared by unfocused ⁸⁴Kr²⁵⁺, has a high selectivity for permeation of the monovalent metal ions ( Rb⁺ > K⁺ > Cs⁺ > Na⁺ > Li⁺, based on permeation concentration), but does not allow Cl^- go through. It is similar to K⁺ channels, which would cause an influx of K⁺ into capsule of graphene with the increase of pH in the primitive ocean, creating a suitable inner condition for the origin of life. Therefore, we built a model cell of graphene, which would provide a route for reproducing the origin of life.