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CTSK
HPA
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  • CTSK
PROTEIN SUMMARY GENE INFORMATION RNA DATA ANTIBODY DATA
GENERAL INFORMATIONi

General description of the gene and the encoded protein(s) using information from HGNC and Ensembl, as well as predictions made by the Human Protein Atlas project.

Gene namei

Official gene symbol, which is typically a short form of the gene name, according to HGNC.

CTSK
Synonyms CTSO, CTSO2, PKND, PYCD
Gene descriptioni

Full gene name according to HGNC.

Cathepsin K
Protein classi

Assigned HPA protein class(es) for the encoded protein(s).

Disease related genes
Enzymes
Human disease related genes
Metabolic proteins
Plasma proteins
Potential drug targets
Predicted locationi

All transcripts of all genes have been analyzed regarding the location(s) of corresponding protein based on prediction methods for signal peptides and transmembrane regions.

  • Genes with at least one transcript predicted to encode a secreted protein, according to prediction methods or to UniProt location data, have been further annotated and classified with the aim to determine if the corresponding protein(s) are secreted or actually retained in intracellular locations or membrane-attached.

  • Remaining genes, with no transcript predicted to encode a secreted protein, will be assigned the prediction-based location(s).

The annotated location overrules the predicted location, so that a gene encoding a predicted secreted protein that has been annotated as intracellular will have intracellular as the final location.

Membrane, Intracellular
Protein evidence Evidence at protein level (all genes)
GENE INFORMATIONi

Gene information from Ensembl and Entrez, as well as links to available gene identifiers are displayed here. Information was retrieved from Ensembl if not indicated otherwise.

Chromosome 1
Cytoband q21.3
Chromosome location (bp) 150794880 - 150809577
Number of transcriptsi

Number of protein-coding transcripts from the gene as defined by Ensembl.

10
Ensembl ENSG00000143387 (version 109)
Entrez gene 1513
HGNC HGNC:2536
UniProt P43235 (UniProt - Evidence at protein level)
neXtProt NX_P43235
GeneCards CTSK
Antibodypedia CTSK antibodies


PROTEIN FUNCTION
Protein function (UniProt)i

Useful information about the protein provided by UniProt.

Thiol protease involved in osteoclastic bone resorption and may participate partially in the disorder of bone remodeling. Displays potent endoprotease activity against fibrinogen at acid pH. May play an important role in extracellular matrix degradation. Involved in the release of thyroid hormone thyroxine (T4) by limited proteolysis of TG/thyroglobulin in the thyroid follicle lumen 1.... show less
Molecular function (UniProt)i

Keywords assigned by UniProt to proteins due to their particular molecular function.

Hydrolase, Protease, Thiol protease
Gene summary (Entrez)i

Useful information about the gene from Entrez

The protein encoded by this gene is a lysosomal cysteine proteinase involved in bone remodeling and resorption. This protein, which is a member of the peptidase C1 protein family, is predominantly expressed in osteoclasts. However, the encoded protein is also expressed in a significant fraction of human breast cancers, where it could contribute to tumor invasiveness. Mutations in this gene are the cause of pycnodysostosis, an autosomal recessive disease characterized by osteosclerosis and short stature. [provided by RefSeq, Apr 2013]... show less
PROTEIN INFORMATIONi

The protein information section displays alternative protein-coding transcripts (splice variants) encoded by this gene according to the Ensembl database.

The Splice variant identifier links to the Ensembl website protein summary for the selected splice variant. The data in the Swissprot and TrEMBL columns links to corresponding pages in the UniProt database.

The protein classes assigned to this protein are shown if expanding the data in the protein class column. Parent protein classes are in bold font and subclasses are listed under the parent class.

The length of the protein (amino acid residues according to Ensembl), molecular mass (kDalton), predicted signal peptide and number of predicted transmembrane region(s) according to in-house majority decision methods based on sets of predictors are also reported.
Splice variant SwissProt TrEMBL Protein class Gene ontology Length & mass Signal peptide
(predicted)
Transmembrane regions
(predicted)
CTSK-201
ENSP00000271651
ENST00000271651
P43235
[Direct mapping] Cathepsin K
Show all
Enzymes
   ENZYME proteins
   Hydrolases
   Peptidases
   Cysteine-type peptidases
Metabolic proteins
   Secreted proteins predicted by MDSEC
   SignalP predicted secreted proteins
   Phobius predicted secreted proteins
   SPOCTOPUS predicted secreted proteins
   DeepTMHMM predicted secreted proteins
   DeepSig predicted secreted proteins
Predicted intracellular proteins
Plasma proteins
Disease related genes
Potential drug targets
Human disease related genes
   Congenital disorders of metabolism
   Lysosomal storage diseases
   Congenital malformations
   Congenital malformations of skin
Mapped to neXtProt
   neXtProt - Evidence at protein level
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0000422 [autophagy of mitochondrion]
GO:0001957 [intramembranous ossification]
GO:0001968 [fibronectin binding]
GO:0004197 [cysteine-type endopeptidase activity]
GO:0004252 [serine-type endopeptidase activity]
GO:0005515 [protein binding]
GO:0005518 [collagen binding]
GO:0005576 [extracellular region]
GO:0005615 [extracellular space]
GO:0005654 [nucleoplasm]
GO:0005737 [cytoplasm]
GO:0005764 [lysosome]
GO:0005886 [plasma membrane]
GO:0006508 [proteolysis]
GO:0006590 [thyroid hormone generation]
GO:0006955 [immune response]
GO:0008233 [peptidase activity]
GO:0008234 [cysteine-type peptidase activity]
GO:0009897 [external side of plasma membrane]
GO:0014070 [response to organic cyclic compound]
GO:0016020 [membrane]
GO:0016324 [apical plasma membrane]
GO:0016787 [hydrolase activity]
GO:0022617 [extracellular matrix disassembly]
GO:0030574 [collagen catabolic process]
GO:0032868 [response to insulin]
GO:0034224 [cellular response to zinc ion starvation]
GO:0036021 [endolysosome lumen]
GO:0043202 [lysosomal lumen]
GO:0043231 [intracellular membrane-bounded organelle]
GO:0043394 [proteoglycan binding]
GO:0045453 [bone resorption]
GO:0045471 [response to ethanol]
GO:0051603 [proteolysis involved in protein catabolic process]
GO:0061037 [negative regulation of cartilage development]
GO:0071356 [cellular response to tumor necrosis factor]
GO:0071560 [cellular response to transforming growth factor beta stimulus]
GO:1903131 [mononuclear cell differentiation]
Show all
329 aa
37 kDa
Yes 0
CTSK-202
ENSP00000405083
ENST00000443913
Q5QP40
[Direct mapping] Cathepsin K
Show all
Metabolic proteins
Predicted membrane proteins
   Prediction method-based
   Membrane proteins predicted by MDM
   MEMSAT3 predicted membrane proteins
   MEMSAT-SVM predicted membrane proteins
   Phobius predicted membrane proteins
   SCAMPI predicted membrane proteins
   SPOCTOPUS predicted membrane proteins
   # TM segments-based
   1TM proteins predicted by MDM
Human disease related genes
   Congenital disorders of metabolism
   Lysosomal storage diseases
   Congenital malformations
   Congenital malformations of skin
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0004197 [cysteine-type endopeptidase activity]
GO:0005576 [extracellular region]
GO:0005654 [nucleoplasm]
GO:0005764 [lysosome]
GO:0005886 [plasma membrane]
GO:0006508 [proteolysis]
GO:0008233 [peptidase activity]
GO:0008234 [cysteine-type peptidase activity]
GO:0016020 [membrane]
GO:0016324 [apical plasma membrane]
GO:0016787 [hydrolase activity]
GO:0043231 [intracellular membrane-bounded organelle]
Show all
388 aa
44.1 kDa
No 1
CTSK-205
ENSP00000504737
ENST00000676716
A0A7I2YQX0
[Direct mapping] Cathepsin K
Show all
Metabolic proteins
   Secreted proteins predicted by MDSEC
   SignalP predicted secreted proteins
   Phobius predicted secreted proteins
   SPOCTOPUS predicted secreted proteins
   DeepTMHMM predicted secreted proteins
   DeepSig predicted secreted proteins
Predicted intracellular proteins
Human disease related genes
   Congenital disorders of metabolism
   Lysosomal storage diseases
   Congenital malformations
   Congenital malformations of skin
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0004197 [cysteine-type endopeptidase activity]
GO:0005764 [lysosome]
GO:0006508 [proteolysis]
GO:0008233 [peptidase activity]
GO:0008234 [cysteine-type peptidase activity]
GO:0016787 [hydrolase activity]
Show all
288 aa
32.2 kDa
Yes 0
CTSK-206
ENSP00000502964
ENST00000676751
A0A7I2V2M6
[Direct mapping] Cathepsin K
Show all
Metabolic proteins
   Secreted proteins predicted by MDSEC
   SignalP predicted secreted proteins
   Phobius predicted secreted proteins
   SPOCTOPUS predicted secreted proteins
   DeepTMHMM predicted secreted proteins
   DeepSig predicted secreted proteins
Predicted intracellular proteins
Human disease related genes
   Congenital disorders of metabolism
   Lysosomal storage diseases
   Congenital malformations
   Congenital malformations of skin
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0004197 [cysteine-type endopeptidase activity]
GO:0005576 [extracellular region]
GO:0005764 [lysosome]
GO:0005886 [plasma membrane]
GO:0006508 [proteolysis]
GO:0008234 [cysteine-type peptidase activity]
GO:0016020 [membrane]
GO:0016324 [apical plasma membrane]
Show all
330 aa
36.9 kDa
Yes 0
CTSK-207
ENSP00000504176
ENST00000676824
P43235
[Direct mapping] Cathepsin K
Show all
Enzymes
   ENZYME proteins
   Hydrolases
   Peptidases
   Cysteine-type peptidases
Metabolic proteins
   Secreted proteins predicted by MDSEC
   SignalP predicted secreted proteins
   Phobius predicted secreted proteins
   SPOCTOPUS predicted secreted proteins
   DeepTMHMM predicted secreted proteins
   DeepSig predicted secreted proteins
Predicted intracellular proteins
Plasma proteins
Disease related genes
Potential drug targets
Human disease related genes
   Congenital disorders of metabolism
   Lysosomal storage diseases
   Congenital malformations
   Congenital malformations of skin
Mapped to neXtProt
   neXtProt - Evidence at protein level
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0000422 [autophagy of mitochondrion]
GO:0001968 [fibronectin binding]
GO:0004197 [cysteine-type endopeptidase activity]
GO:0004252 [serine-type endopeptidase activity]
GO:0005515 [protein binding]
GO:0005518 [collagen binding]
GO:0005576 [extracellular region]
GO:0005615 [extracellular space]
GO:0005654 [nucleoplasm]
GO:0005764 [lysosome]
GO:0005886 [plasma membrane]
GO:0006508 [proteolysis]
GO:0006590 [thyroid hormone generation]
GO:0006955 [immune response]
GO:0008233 [peptidase activity]
GO:0008234 [cysteine-type peptidase activity]
GO:0016020 [membrane]
GO:0016324 [apical plasma membrane]
GO:0016787 [hydrolase activity]
GO:0022617 [extracellular matrix disassembly]
GO:0030574 [collagen catabolic process]
GO:0036021 [endolysosome lumen]
GO:0043202 [lysosomal lumen]
GO:0043231 [intracellular membrane-bounded organelle]
GO:0043394 [proteoglycan binding]
GO:0051603 [proteolysis involved in protein catabolic process]
Show all
329 aa
37 kDa
Yes 0
CTSK-208
ENSP00000503723
ENST00000676966
P43235
[Direct mapping] Cathepsin K
Show all
Enzymes
   ENZYME proteins
   Hydrolases
   Peptidases
   Cysteine-type peptidases
Metabolic proteins
   Secreted proteins predicted by MDSEC
   SignalP predicted secreted proteins
   Phobius predicted secreted proteins
   SPOCTOPUS predicted secreted proteins
   DeepTMHMM predicted secreted proteins
   DeepSig predicted secreted proteins
Predicted intracellular proteins
Plasma proteins
Disease related genes
Potential drug targets
Human disease related genes
   Congenital disorders of metabolism
   Lysosomal storage diseases
   Congenital malformations
   Congenital malformations of skin
Mapped to neXtProt
   neXtProt - Evidence at protein level
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0000422 [autophagy of mitochondrion]
GO:0001968 [fibronectin binding]
GO:0004197 [cysteine-type endopeptidase activity]
GO:0004252 [serine-type endopeptidase activity]
GO:0005515 [protein binding]
GO:0005518 [collagen binding]
GO:0005576 [extracellular region]
GO:0005615 [extracellular space]
GO:0005654 [nucleoplasm]
GO:0005764 [lysosome]
GO:0005886 [plasma membrane]
GO:0006508 [proteolysis]
GO:0006590 [thyroid hormone generation]
GO:0006955 [immune response]
GO:0008233 [peptidase activity]
GO:0008234 [cysteine-type peptidase activity]
GO:0016020 [membrane]
GO:0016324 [apical plasma membrane]
GO:0016787 [hydrolase activity]
GO:0022617 [extracellular matrix disassembly]
GO:0030574 [collagen catabolic process]
GO:0036021 [endolysosome lumen]
GO:0043202 [lysosomal lumen]
GO:0043231 [intracellular membrane-bounded organelle]
GO:0043394 [proteoglycan binding]
GO:0051603 [proteolysis involved in protein catabolic process]
Show all
329 aa
37 kDa
Yes 0
CTSK-209
ENSP00000503832
ENST00000676970
A0A7I2V4B1
[Direct mapping] Cathepsin K
Show all
Metabolic proteins
   Secreted proteins predicted by MDSEC
   SignalP predicted secreted proteins
   Phobius predicted secreted proteins
   SPOCTOPUS predicted secreted proteins
   DeepTMHMM predicted secreted proteins
   DeepSig predicted secreted proteins
Predicted intracellular proteins
Human disease related genes
   Congenital disorders of metabolism
   Lysosomal storage diseases
   Congenital malformations
   Congenital malformations of skin
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0004197 [cysteine-type endopeptidase activity]
GO:0005576 [extracellular region]
GO:0005764 [lysosome]
GO:0005886 [plasma membrane]
GO:0006508 [proteolysis]
GO:0008233 [peptidase activity]
GO:0008234 [cysteine-type peptidase activity]
GO:0016020 [membrane]
GO:0016324 [apical plasma membrane]
GO:0016787 [hydrolase activity]
Show all
333 aa
37.4 kDa
Yes 0
CTSK-212
ENSP00000503876
ENST00000677887
A0A7I2V4B6
[Direct mapping] Cathepsin K
Show all
Metabolic proteins
   MEMSAT3 predicted membrane proteins
   MEMSAT-SVM predicted membrane proteins
   Phobius predicted membrane proteins
   SCAMPI predicted membrane proteins
   TMHMM predicted membrane proteins
   Secreted proteins predicted by MDSEC
   SPOCTOPUS predicted secreted proteins
   DeepTMHMM predicted secreted proteins
   DeepSig predicted secreted proteins
Predicted intracellular proteins
Human disease related genes
   Congenital disorders of metabolism
   Lysosomal storage diseases
   Congenital malformations
   Congenital malformations of skin
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0004197 [cysteine-type endopeptidase activity]
GO:0005576 [extracellular region]
GO:0005764 [lysosome]
GO:0005886 [plasma membrane]
GO:0006508 [proteolysis]
GO:0008233 [peptidase activity]
GO:0008234 [cysteine-type peptidase activity]
GO:0016020 [membrane]
GO:0016324 [apical plasma membrane]
GO:0016787 [hydrolase activity]
Show all
343 aa
38.6 kDa
Yes 0
CTSK-214
ENSP00000504759
ENST00000678337
A0A7I2V5Y6
[Direct mapping] Cathepsin K
Show all
Metabolic proteins
   MEMSAT3 predicted membrane proteins
   MEMSAT-SVM predicted membrane proteins
   SCAMPI predicted membrane proteins
   THUMBUP predicted membrane proteins
   Secreted proteins predicted by MDSEC
   SPOCTOPUS predicted secreted proteins
   DeepTMHMM predicted secreted proteins
   DeepSig predicted secreted proteins
Predicted intracellular proteins
Human disease related genes
   Congenital disorders of metabolism
   Lysosomal storage diseases
   Congenital malformations
   Congenital malformations of skin
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0004197 [cysteine-type endopeptidase activity]
GO:0005576 [extracellular region]
GO:0005764 [lysosome]
GO:0005886 [plasma membrane]
GO:0006508 [proteolysis]
GO:0008233 [peptidase activity]
GO:0008234 [cysteine-type peptidase activity]
GO:0016020 [membrane]
GO:0016324 [apical plasma membrane]
GO:0016787 [hydrolase activity]
Show all
341 aa
38.5 kDa
Yes 0
CTSK-220
ENSP00000504534
ENST00000679260
A0A7I2V5Y9
[Direct mapping] Cathepsin K
Show all
Metabolic proteins
   Secreted proteins predicted by MDSEC
   SignalP predicted secreted proteins
   Phobius predicted secreted proteins
   SPOCTOPUS predicted secreted proteins
   DeepTMHMM predicted secreted proteins
   DeepSig predicted secreted proteins
Predicted intracellular proteins
Human disease related genes
   Congenital disorders of metabolism
   Lysosomal storage diseases
   Congenital malformations
   Congenital malformations of skin
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0006508 [proteolysis]
GO:0008234 [cysteine-type peptidase activity]
Show all
256 aa
29.2 kDa
Yes 0

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