Give 4 examples of pairs of polar amino acids that might be substituted for each other...

Give 4 examples of pairs of polar amino acids that might be substituted for each other with little effect on protein function due to the amino acids having the same functional group. For each pair, name the functional group they have in common.

Expert Solution

The four pairs of amino acids are listed below.

i) Asparagine (Asn) and Glutamine (Gln); both contain neutral functional groups. The neutral functional group present is –CONH₂. Asn contains –CH₂CONH₂ while Gln has –CH₂CH₂CONH₂.

ii) Aspartic acid (Asp) and Glutamic acid (Glu); both are acidic amino acids and the functional group present is –COOH. Asp contains –CH₂COOH and Glu contains –CH₂CH₂COOH.

iii) Serine (Ser) and Threonine (Thr); both are neutral polar amino acids containing functional group –OH. Ser contains –CH₂OH as the side chain while Thr has –CH(OH)CH₃ as the side chain.

iv) Histidine (His) and Tryptophan (Trp); both are neutral polar amino acids containing 5-membered N-rings. His contains imidazole ring while Trp has indole ring.

queen_honey_blossom answered 2 years ago

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