Uni-directional polymerization leading to homochirality in the RNA world

Details Uni-directional polymerization leading to homochirality in the RNA world Uni-directional polymerization leading to homochirality in the RNA world

2005-05-21

arxiv.org/abs/q-bio/0505041v1

Int. J. Astrobiology 4, 233-239 (2005)

Biology

Quantitative Biology

Biomolecules

9 pages, 4 figures, submitted to Astrobiology

Scientific paper

10.1017/S1473550405002752

The differences between uni-directional and bi-directional polymerization are considered. The uni-directional case is discussed in the framework of the RNA world. Similar to earlier models of this type, where polymerization was assumed to proceed in a bi-directional fashion (presumed to be relevant to peptide nucleic acids), left-handed and right-handed monomers are produced via an autocatalysis from an achiral substrate. The details of the bifurcation from a racemic solution to a homochiral state of either handedness is shown to be remarkably independent of whether the polymerization in uni-directional or bi-directional. Slightly larger differences are seen when dissociation is allowed and the dissociation fragments are being recycled into the achiral substrate.

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