Catalysis in Reaction Networks

Details Catalysis in Reaction Networks Catalysis in Reaction Networks

2010-06-18

arxiv.org/abs/1006.3627v3

Bull Math Biol (2011) 73:2962 -- 2982

Biology

Quantitative Biology

Molecular Networks

19 pages, 1 figure

Scientific paper

10.1007/s11538-011-9655-3

We define catalytic networks as chemical reaction networks with an essentially catalytic reaction pathway: one which is on in the presence of certain catalysts and off in their absence. We show that examples of catalytic networks include synthetic DNA molecular circuits that have been shown to perform signal amplification and molecular logic. Recall that a critical siphon is a subset of the species in a chemical reaction network whose absence is forward invariant and stoichiometrically compatible with a positive point. Our main theorem is that all weakly-reversible networks with critical siphons are catalytic. Consequently, we obtain new proofs for the persistence of atomic event-systems of Adleman et al., and normal networks of Gnacadja. We define autocatalytic networks, and conjecture that a weakly-reversible reaction network has critical siphons if and only if it is autocatalytic.

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