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For Research Use Only. Not for use in diagnostic procedures.

Klotho, named after one of the Fates in Greek mythology, is a type-I transmembrane protein that is associated with many functions. A novel ?-glucuronidase, Klotho has been associated with phosphate regulation, organ protection, and aging, among others. Though a single gene, it has 3 major isoforms: the transmembrane form, a shed soluble form, and a truncated soluble form. The extracellular portion of the protein consists of two glycosyl hydrolase domains referred to as KL1 and KL2. Upon cleavage at the base of the extracellular domain the protein becomes the shed soluble form, and is an active form that functions as a hormone.