Interacts with the Salmonella typhimurium virulence protein spiC. May be part of some vesicular structure distinct from lysosomal vesicles. Ubiquitous. Highly expressed in liver, kidney and muscle. Expressed at intermediate level in brain, heart, colon, thymus, kidney, small intestine, placenta, lung, leukocytes and spleen. Belongs to the NipSnap family.