Kidney Injury Molecule-1 (KIM-1) is a type 1 transmembrane glycoprotein. KIM-1 is highly up regulated in proximal tubular cells following kidney injury. It consists of an extracellular portion, a novel 6-cysteine immunoglobulin-like domain, 2 N-glycosylation sites, also contains one transmembrane domain and a short cytoplasmic domain with a conservative tyrosine phosphorylation site.