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Shrimp tropomyosin, a major allergen found in crustaceans, is characterized by its repetitive coiled-coil structure which contributes to its stability and resistance to digestion. This protein, identified as Pen a 1 in shrimp, contains several IgE-binding regions that are crucial for its allergenic properties. Tropomyosin is capable of self-assembling into nanofibres under high ionic strength conditions, a feature that distinguishes it from vertebrate tropomyosins. The gene encoding shrimp tropomyosin is located in the muscle tissue, and its allergenic potential is often studied in the context of food allergies, particularly in marine invertebrates. Structural analyses using techniques like SDS-PAGE and circular dichroism have been employed to understand its conformation and digestibility, which are vital for developing methods to reduce its allergenicity.
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