Component of the type III secretion system (T3SS), also called injectisome, which is used to inject bacterial effector proteins into eukaryotic host cells (By similarity). Acts as a regulator of the YscN/SctN ATPase activity (By similarity). The core secretion machinery of the T3SS is composed of approximately 20 different proteins, including cytoplasmic components, a base, an export apparatus and a needle (PubMed:30107569). This subunit is part of the cytosolic complex (By similarity). Interacts directly with YscN/SctN (T3SS ATPase) and YscQ/SctQ (the major sorting platform component) (By similarity). At 37 degrees Celsius in the absence of calcium. Belongs to the SctL stator family. It is uncertain whether Met-1 or Met-12 is the initiator.