Methionine can act as a precursor to N-acetyl cysteine, which is considered to be the rate limiting step for making glutathione.3 Glutathione is composed of 3 amino acids: glycine, cysteine, and glutamine
J Leukoc Biol (2016) 100(5):97984
Notably, a propargyl group at P1 or alternatively an extended P1 side chain resulted both in very potent and fairly selective IRAP inhibitors, 45 (DG046) with IC50 values of 2 nM and 46 with a IC50 value of 4 nM (Figure 11)
doi:10.1016/bs.afnr.2017.11.005
The major part of the flux is carried by the low affinity transporter, which has sigmoidal kinetics with a V max in the range 9001400 M/hr, a K m of approximately 3000 M, and a Hill coefficient of approximately 3 [3436]
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