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What are the four levels of protein structure? For each level, list what types of bonds and where in the structure each bond is found?
in General Knowledge by Platinum (163,814 points) | 130 views

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1. Primary structure - consists of covalent peptide bonds between amino acids. This is also known as the sequence of the protein.

2. Secondary structure - consists mostly of hydrogen bonds between local areas of a protein sequence. The hydrogen bonds frequently occur between backbone carbonyl and amino groups and usually form structures like alfa helices and beta sheets.

3. Tertiary structure - this is the overall 3 dimensional structure of the protein, which includes how the beta sheets and alfa helices interact in 3 dimensions. Noncovalent bonds and interactions involving the amino acid side chains are frequently observed - these include hydrophobic interactions, salt bridges, and hydrogen bonds. However, there are covalent bonds in the case of disulfide bridges.

4. Quaternary structure - this involves interactions between different (not covalently connected) polypeptide chains or protein subunits to "build" a multimeric protein. The same types of noncovalent bonds and interactions in tertiary structure are important for quaternary structure, although these interactions are between different polypeptide chains.
by Platinum (163,814 points)

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