Abstract
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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M. Gopalkrishnan’s part of this work was supported by NSF DMS-0943760.
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Gopalkrishnan, M. Catalysis in Reaction Networks. Bull Math Biol 73, 2962–2982 (2011). https://doi.org/10.1007/s11538-011-9655-3
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DOI: https://doi.org/10.1007/s11538-011-9655-3