Question

The hydropathy of an amino acid can be used to predict whether an amino acid side...

The hydropathy of an amino acid can be used to predict whether an amino acid side chain folds towards the inside or outside of a globular protein. Positive values are hydrophilic while negative values are hydrophobic.

True or false?

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Answer #1

Hydropathy plot is a quantitative representation of hydrophilicity/hydrophobicity of amino acid stretches in a polypeptide chain. It is used to determine the membrane-spanning regions of proteins. Hydrophilic amino acids are located on the surface of a globular protein. Hydrophobic amino acids are buried inside the core of a globular protein.

Hydrophobic amino acids have a positive hydropathy score.
Examples:
Ile = +4.5
Val = +4.2
Phe = +2.8

Hydrophilic amino acids have a negative hydropathy score.
Examples:
Arg = -4.5
Lys = -3.9
Asn = -3.5

So, the given statement is incorrect.

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