Which categories of amino acid would you expect to find on the surface of a soluble protein, and which would you expect to find in the interior? What distribution of amino acids would you expect to find in a protein embedded in a lipid bilayer?

Polar and charged amino acid residues (the remainder after peptide bond formation) are more likely to be found on the surface of soluble proteins where they can interact with water, and nonpolar (e.g., amino acid side chains) are more likely to be found in the interior where they are sequestered from water.

Explanation:

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luisvaschetto luisvaschetto · Answer 2 · 2021-09-07T20:37:59+02:00

The amino acids with POLAR and CHARGED side chains are expected to be observed on the membrane surface, whereas amino acids with NON-POLAR and HYDROPHOBIC side chains are expected to be found inside the lipid bilayer.

The lipidic bilayer is mainly composed of phospholipids.

Phospholipids have hydrophilic, polar phosphate heads facing out on each surface to interact with water and hydrophobic fatty acid tails facing each other inside the lipid bilayer.

The polar and charged side chains of amino acids are expected to be observed on the surface of membrane proteins because they can interact with water (H2O) molecules.

On the other hand, nonpolar side chains of specific amino acids are expected to be observed inside the lipid bilayer to interact with the hydrophobic fatty acid tails of phospholipids.

The polar amino acids include glutamine, glutamic acid, arginine, asparagine, aspartic acid, histidine, lysine, serine, and threonine.

Moreover, amino acids with hydrophobic side chains include leucine, isoleucine, glycine, alanine, valine and proline.

In conclusion, amino acid residues with POLAR and CHARGED side chains are expected to be observed on the membrane surface, whereas amino acids with NON-POLAR and HYDROPHOBIC chains are expected to be found inside the lipid bilayer.

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