Fung SPS, Wang H, Tomek P, Squire CJ, Flanagan JU, Palmer BD, Bridewell DJA, Tijono SM, Jamie JF, Ching LM. Discovery and characterisation of hydrazines as inhibitors of the immune suppressive enzyme, indoleamine 2,3-dioxygenase 1 (IDO1).
Bioorg Med Chem 2013;
21:7595-603. [PMID:
24262887 DOI:
10.1016/j.bmc.2013.10.037]
[Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2013] [Revised: 10/16/2013] [Accepted: 10/24/2013] [Indexed: 11/30/2022]
Abstract
Screening of a fragment library identified 2-hydrazinobenzothiazole as a potent inhibitor of indoleamine 2,3-dioxygenase 1 (IDO1), an enzyme expressed by tumours that suppresses the immune system. Spectroscopic studies indicated that 2-hydrazinobenzothiazole interacted with the IDO1 haem and in silico docking predicted that the interaction was through hydrazine. Subsequent studies of hydrazine derivatives identified phenylhydrazine (IC50=0.25 ± 0.07 μM) to be 32-fold more potent than 2-hydrazinobenzothiazole (IC50=8.0 ± 2.3 μM) in inhibiting rhIDO1 and that it inhibited cellular IDO1 at concentrations that were noncytotoxic to cells. Here, phenylhydrazine is shown to inhibit IDO1 through binding to haem.
Collapse