TRM61 Inhibitors

TRM61 inhibitors refer to a class of compounds that can indirectly inhibit the activity of the TRM61 protein, a subunit of the tRNA methyltransferase complex. These inhibitors work by targeting various stages of the tRNA modification process or by interfering with the general methylation machinery within the cell. The listed compounds are not direct inhibitors of TRM61 but can affect the protein's function by altering substrate availability or inhibiting related enzymatic activities.

Compounds like Adenosine periodate and 5-Azacytidine can modify the substrate (tRNA) such that its recognition by TRM61 is altered, which can prevent proper methylation. Sinefungin and Neplanocin A are nucleoside analogs that inhibit methyltransferase enzymes broadly, which can include enzymes like TRM61. SAH and MTA are feedback inhibitors; they are products or byproducts of the methylation reaction that can inhibit methyltransferases, including TRM61, by occupying the enzyme's active site. Other compounds, such as BIX-01294 and RG108, are known to inhibit DNA methyltransferases, and due to the similarity in the catalytic mechanisms, they might also inhibit RNA methyltransferases. Decitabine and Zebularine are cytidine analogs that can incorporate into RNA and DNA, potentially inhibiting methylation processes at large, which can indirectly affect TRM61 activity. Additionally, compounds like 3-Deazaneplanocin A inhibit the enzyme S-adenosylhomocysteine hydrolase, leading to the accumulation of SAH, a strong product inhibitor of methyltransferases, thereby inhibiting TRM61 activity. Cycloleucine can inhibit the synthesis of S-adenosylmethionine (SAM), the primary methyl donor for methylation reactions, affecting TRM61's methylation activity.