When this specific three-dimensional structure is disrupted, the protein loses its functionality and is said to have undergone denaturation. The interactions, such as hydrogen bonding , that dictate the tertiary structure of proteins are not as strong as covalent chemical bonds.
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From Wikipedia, the free encyclopedia. For the shrub with the same vernacular name, see Vinca minor. The common periwinkle or winkle (Littorina littorea) is a species of small edible sea snail, a marine gastropod mollusc that has gills and an operculum, and is classified within the family Littorinidae, the periwinkles.This is a robust intertidal species with a dark and sometimes banded shell.ommon periwinkles have been introduced to the Atlantic coast of North America, possibly by rock ballast in the mid-19th century. The first recorded case was in 1840 in the Gulf of St. Lawrence.