Cathepsin K

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Cathepsin K is the processed form of the 329 amino acid peptide preprocathepsin coded by the CTSK gene at 1q21.3. It is a potent cysteine endoprotease for fibrinogen at acid pH and appears to have an important role in extracellular matrix degradation by osteoclasts. It is also expressed in some some hypertrophic chondrocytes. Inhibiting cathepsin K is being targeted as a means of maintaining bone mineral density in osteoporosis.

Mutations of the gene cause pycnodysostosis which is an autosomal recessive osteochondrodysplasia with osteosclerosis and short stature.

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