(1S,2S)-ML-SI3 is a trans-isomer of ML-SI3 that targets all three isoforms of TRPML. (1S,2S)-ML-SI3 is an activator of TRPML2 and TRPML3 (EC50=2.7 μM/10.8 μM) and a potent inhibitor of TRPML1 (IC50=5.9 μM).
Table: Activation and inhibition of the three subtypes of TRPML by the ML-SI3-type compounds[1]
References:
[1]. Leser C, et al. Chemical and pharmacological characterization of the TRPML calcium channel blockers ML-SI1 and ML-SI3. Eur J Med Chem. 2021 Jan 15;210:112966.