Is There Sufficient Evidence that the Melatonin Binding Site MT3 Is Quinone Reductase 2
2019
In the 1980s, researchers used binding studies to show that there is a melatonin binding site in addition to the receptors described previously. It was first termed ML 2 and then, in 1999, MT 3 . Purification efforts led to its identification as
quinone
reductase2. Several lines of evidence support the notion that MT 3 is the same as
quinone
reductase2, including the detection and characterization of MT 3 whenever
quinone
reductase2 was added to various systems under various conditions. This evidence is discussed in this review, which summarizes the results of relevant cellular and animal experiments. The recent discovery that the
quinone
reductase2 enzyme can be partly membrane-associated may unite the current body of evidence and allow us to conclude definitively that the third melatonin binding site, MT 3 , is indeed
quinone
reductase2.
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