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Reductase enzymatic activity The reductase activities of the WT and mutant (K8A, C20A and K47A) proteins were measured spectrophotometrically by recording the increase in absorbance at 260 nm using a UV-VIS spectrophotometer (UV-1800, Shimadzu, Kyoto, Japan) as described previously 37
A peptide that has changed color in its powder form (from white to yellow or brown) is likely degraded
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Moreover, GS is inactivated by extracellular glutamine because the presence of glutamine induces GS acetylation by p300/CBP protein, facilitating its ubiquitination and proteasomal degradation [79-81]
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