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A Proposed Function for Spermine and Spermidine: Protection of Replicating DNA Against Damage by Singlet Oxygen

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Specialty Science
Date 1992 Dec 1
PMID 1454830
Citations 39
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Abstract

Like all aliphatic amines, the polyamines spermine and spermidine are physical quenchers of singlet molecular oxygen (1O2*). The rate constants of these processes were determined in vitro with photochemically generated 1O2* and the hydrocarbon rubrene as substrate, in pyridine. At millimolar concentration, spermine and spermidine should quench 1O2* in vivo and prevent it from damaging DNA. It is proposed that a biological function of polyamines is the protection of replicating DNA against oxidative damage.

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