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Apple Snail Perivitellin Precursor Properties Help Explain Predators' Feeding Behavior
María Pilar Cadierno1, Marcos Sebastián Dreon1,2, Horacio Heras1,3
11 Instituto de Investigaciones Bioquímicas de La Plata (INIBIOLP), Consejo Nacional de Investigaciones Científicas y Técnicas-Universidad Nacional de La Plata (CONICET-UNLP), La Plata, Argentina.
Physiological and Biochemical Zoology : PBZ
|April 13, 2017
Summary
Apple snails store active defensive proteins in their albumen gland, unlike other invertebrates. These perivitellin precursors are stable, antinutritive, and toxic, explaining why predators avoid them.
Area of Science:
- Marine Biology
- Biochemistry
- Animal Behavior
Background:
- Gastropod reproductive tracts feature an albumen gland (AG) secreting perivitelline fluid.
- The apple snail (Pomacea canaliculata) AG produces defensive perivitellins, yet predators avoid it for unknown reasons.
Purpose of the Study:
- To analyze the structure-function properties of perivitellin precursors.
- To understand perivitellin maturation and its link to predator avoidance in apple snails.
Main Methods:
- Structural analysis: small-angle X-ray scattering, spectroscopy, circular dichroism, electrophoresis, chromatography, partial proteolysis.
- Functional analysis: proteinase digestion, pH stability tests, toxicity assays in mice.
Main Results:
- Perivitellin precursors (PcOvo, PcPV2) are structurally similar to mature egg forms.
- Precursors are stable, antinutritive, resist digestion, and maintain quaternary structure across pH 4.0-10.0.
- AG extracts are toxic to mice and limit nutrient digestion, exhibiting neurotoxic effects.
Conclusions:
- Gastropod perivitellin precursors do not undergo extensive structural processing like vitellogenins.
- The apple snail AG contains active, defensive proteins with neurotoxic, antinutritive, and antidigestive properties.
- These properties likely explain predator avoidance of the apple snail AG.