Cyclic di-GMP-II riboswitch
Cyclic di-GMP-II riboswitches (also c-di-GMP-II riboswitches) form a class of riboswitches that specifically bind cyclic di-GMP, a second messenger used in multiple bacterial processes such as virulence, motility and biofilm formation. Cyclic di-GMP II riboswitches are structurally unrelated to cyclic di-GMP-I riboswitches, though they have the same function.
Source: Wikipedia — Cyclic di-GMP-II riboswitch (CC BY-SA 4.0)