Side-chain hydrogen bonding Check all that apply Disulfide bonds Check all that

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Side-chain hydrogen bonding

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Disulfide bonds

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Two cysteine residues can form hydrogen bonds. Threonine and glutamine can form hydrogen bonds. Side chains connect distant parts of a polypeptide chain and introduce loops into the chain. Hydrogen bonds stabilize quaternary protein structure by holding together several protein strands. Side chains that can form hydrogen bonds are located on the outside of a protein, where they can stabilize tertiary structure by forming hydrogen bonds with water.

Disulfide bonds

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Threonine and glutamine form disulfide bridges. Disulfide bonds connect distant parts of a polypeptide chain and introduce loops into the chain. Disulfide bonds that can form hydrogen bonds are located on the outside of a protein, where they can stabilize tertiary structure by forming hydrogen bonds with water. Two cysteine residues form disulfide bridges. Hydrogen bonds stabilize quaternary protein structure by holding together several protein strands.

Explanation / Answer

Hydrogen bond

Disulfide bond

two cystine residues form disulfide bridges- cystines have side chains which contains sulfer. Dilsulfide bidge is formed between this side chains.

Disulfide bonds connect distant parts of a polypeptide chain and introduce loops into the chain- dilsulfide bond join two parts of polypeptide chain which in normal situation are situated apart by large number of aino acids.

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