describe the two roles of glutathione in affinity chromatography - an overview Protein Affinity Chromatography
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But yeah, sometimes I love that analogy

Silymarin compounds: chemistry, innovative extraction techniques and synthesis

In this way, SAM serves as a sensor of dietary methionine such that homocysteine is recycled to reform methionine when dietary intake is low and is catabolized when dietary intake is high
Nutrition and metabolism of glutamate and glutamine in fish

Binding of transcription factors to DNA elements leads to the recruitment of CBP and/or other coactivators to the transcriptional initiation complex on the promoter regions of various genes 28
In essence, MOTS-c acts as a metabolic master switch that promotes energy homeostasis: it helps cells take up and use glucose, ramps up fat burning, and avoids metabolic dysfunction under stress conditions