Collagen Structure - Protein Biochemistry

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Collagen is the most abundant protein in vertebrates. It has a very high tensile strength, and it is essential component of some of our strongest structures, e.g. bones, teeth, ligaments, tendons, cartilage, etc. Collagen makes up about 30% of our bodies by mass.
In this video, I discuss the unique triple helix structure of collagen, along with a discussion of its unusual amino acid composition. Collagen is one of the best-studied fibrous proteins.
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Hello sir.
Is the triple helical structure of collagen considered a secondary structure or quartarnary? According to my understanding since there are several polypeptide chains forming the structure, it should be categorized as quartarnary but various sources classify it under secondary structure. Could you please explain.

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