Cathepsin S (CTSS) Antibody – Rabbit Polyclonal

The protein encoded by this gene, a member of the peptidase C1 family, is a lysosomal cysteine proteinase that may participate in the degradation of antigenic proteins to peptides for presentation on MHC class II molecules. The encoded protein can function as an elastase over a broad pH range in alveolar macrophages. Alternatively spliced transcript variants encoding distinct isoforms have been found for this gene. [provided by RefSeq, Dec 2010]

CTSS: Thiol protease. Key protease responsible for the removal of the invariant chain from MHC class II molecules. The bond- specificity of this proteinase is in part similar to the specificities of cathepsin L and cathepsin N. Belongs to the peptidase C1 family. 2 isoforms of the human protein are produced by alternative splicing.

Protein type: EC 3.4.22.27; Protease

Chromosomal Location of Human Ortholog: 1q21.3

Cellular Component: extracellular region; extracellular space; intracellular membrane-bound organelle; lysosomal lumen; lysosome

Molecular Function: collagen binding; cysteine-type endopeptidase activity; fibronectin binding; laminin binding; proteoglycan binding; serine-type endopeptidase activity

Biological Process: adaptive immune response; antigen processing and presentation; antigen processing and presentation of exogenous peptide antigen via MHC class II; antigen processing and presentation of peptide antigen; collagen catabolic process; extracellular matrix disassembly; immune response; neutrophil degranulation; protein processing; proteolysis; proteolysis involved in cellular protein catabolic process; response to acidic pH; toll-like receptor signaling pathway