Analyses of the bioluminescence mechanism in the land snail, Quantula weinkauffiana.

The mechanism of bioluminescence in the luminous land snails remains largely unknown. Here, we analyzed basic biochemical properties of the luminous land snail, Quantula weinkauffiana. The luminescence activity was extracted from the light organ located near the mouth using a neutral buffer containing detergent. The reaction of the crude buffer extract was triggered by the addition of only hydrogen peroxide (H 2 O 2 ). These results are inconsistent with the single precedent report on the bioluminescence in the Quantula striata by Shimomura and Haneda in 1986, in which the luminescence of the buffer extract (without detergent) from the light organ was induced by the coaddition of three indispensable components H 2 O 2 , ferrous ion, and 2-mercaptoethanol. Based on the present findings, we suggested that an insoluble photoprotein is involved in the bioluminescence of the luminous land snails and the luminescence reaction is simply triggered by H 2 O 2 .