Elongator complex-associated factor that is not a structural subunit but rather transiently contacts the complex (By similarity). Regulates both meristem activity and organ growth; acts as a positive regulator of adaxial leaf patterning. Required for an early step in synthesis of 5-carbamoylmethyl (ncm5) groups present on uridines (ncm5U) at the wobble position in tRNA (By similarity). Interacts with the elongator complex (By similarity). Binds to calmodulin in a calcium-dependent manner (By similarity). Belongs to the KTI12 family. Extended N-terminus.