A pre-cell is a hypothetical lipid-based structure that, under the RNA world hypothesis, could have confined RNA in ancient times. A pre-cell allowed the RNA to remain in close proximity with other RNA molecules, keeping them concentrated and allowing for an increased reaction rate of enzymes. Pre-cells would have had semi-permeable membranes, allowing only certain molecules to pass through. These enclosed structures may have facilitated natural selection in RNA molecules.
Pre-cells are thought to have had a membrane composed of mixed-enantiomer lipid molecules. As natural selection proceeded, pre-cells may have developed steriospecific lipid membranes through frequent fission and fusion of racemic pre-cells.
- Black, S (1970 May 23). "Pre-cell evolution and te origin of enzymes.". Nature 226 (5247): 754–5. doi:10.1038/226754a0. PMID 5443250.
- Wächtershäuser, G (2003 Jan). "From pre-cells to Eukarya--a tale of two lipids". Molecular microbiology 47 (1): 13–22. doi:10.1046/j.1365-2958.2003.03267.x. PMID 12492850.
|This molecular or cell biology article is a stub. You can help Wikipedia by expanding it.|