Streptolydigin inhibits RNA synthesis by binding to RNA polymerase and does not inhibit eukaryotic RNA polymerases. Streptolydigin is a 3-acetyltetramic acid antibiotic and a potent bacterial RNA polymerase inhibitor (Ki: 18 μM and a Kd: 15 μM).
Pseudouridimycin is a C-nucleoside analogue. Pseudouridimycin is an antibiotic and is a selective bacterial RNA polymerase (RNAP) inhibitor. It is effective against both Gram-negative and Gram-positive bacteria.