BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Note also that the carbon of isoleucine is optically active, just as the carbon of threonine. These two amino acids, isoleucine and threonine, have in common the fact that they have two chiral centers.

Detailed explanation-2: -Threonine has two chiral centers and therefore four possible stereoisomers.

Detailed explanation-3: -In the case of isoleucine and threonine, both chiral centers must be inverted to generate the mirror image amino acids d-isoleucine and d-threonine.

Detailed explanation-4: -Introduction. Most amino acids such as alanine, valine, and leucine are chiral, meaning that such molecules can occur in their left-handed and in their right-handed form. These mirror-image forms are non-superimposable to each other and they are called enantiomers.

Detailed explanation-5: -Together with threonine, isoleucine is one of two common amino acids that have a chiral side chain.