Effector proteins function to alter host cell physiology and promote bacterial survival in host tissues. May act as a translocator that mediates translocation of SPI-2 TTSS effector proteins from intraphagosomal bacterial cells into the host cells. May form a complex with SseB and SseC. SseB is required for correct localization of SseD on the bacterial cell surface. Binds to the chaperone SseA. Secreted via type III secretion system 2 (SPI-2 TTSS). After secretion, localizes mainly on the surface of the bacterial cell. Disruption prevents SpvB-induced F-actin depolymerization in human macrophages without affecting intra-bacterial SpvB protein levels.