Invitrogen™ Human Calpain 6 (aa 498-595) Control Fragment Recombinant Protein

Calpain-6, also known as calpamodulin or calpain-X, is an intracellular, calcium-dependent cysteine protease. Calpain-6 has a much more tissue-specific expression in adults than the ubiquitous calpain-1 and calpain-2, and has thus far been found primarily in the placenta, although it is expressed embryonically in a number of tissues. The classical calpain family members consist of a common small subunit (calpain-4), and a large variable subunit, but it is not known if calpain-6 associates with a small subunit. Domains in the large subunit include the amino terminal domain-I, the proteinase domain-II, domain-III, and the EF-hand domain-IV (domain T in calpains 5 and 6). Located on the X chromosome, the calpain-6 sequence lacks the 'EF hand' calcium-binding motif found in domain-IV of the classical calpains. In addition, the canonical active site Cys, His and Asn are modified to Lys, His, Asn in human and Lys, Tyr, Asn in mouse calpain-6, making it unlikely that calpain-6 is proteolytically active.