Which of the following amino acids is a key regulator of the mTOR signaling pathway, which controls protein synthesis?

A Leucine ✓
B Glutamine
C Arginine
D Lysine

Explanation

Leucine is a branched-chain amino acid that activates the mTOR signaling pathway, which regulates protein synthesis and cell growth.

Mnemonic

Leucine = 'lever' for mTOR

Source

Proud, C.G., Cell Signaling, 2017
Protein Metabolism Biochemistry Protein Synthesis Regulation Hard MEDICAL Confidence: medium