PTK6

PTK6
Available structures
PDB	Ortholog search: PDBe RCSB
List of PDB id codes
	1RJA, 2KGT
Identifiers
Aliases	PTK6, BRK, protein tyrosine kinase 6
External IDs	OMIM: 602004; MGI: 99683; HomoloGene: 68494; GeneCards: PTK6; OMA:PTK6 - orthologs
Gene location (Human)
Chr.	Chromosome 20 (human)
End	63,537,376 bp
Gene location (Mouse)
Chr.	Chromosome 2 (mouse)
End	180,844,582 bp
RNA expression pattern
	Top expressed in
	mucosa of transverse colon; ; human penis; ; skin of abdomen; ; skin of leg; ; mucosa of pharynx; ; gums; ; amniotic fluid; ; gingival epithelium; ; oral cavity; ; jejunal mucosa;
	Top expressed in
	jejunum; ; esophagus; ; lip; ; intestinal villus; ; blastocyst; ; skin of external ear; ; tongue; ; ileum; ; Ileal epithelium; ; duodenum;
	More reference expression data
	More reference expression data
Gene ontology
Molecular function	transferase activity; nucleotide binding; protein kinase activity; non-membrane spanning protein tyrosine kinase activity; kinase activity; protein binding; identical protein binding; signaling receptor binding; ATP binding; protein tyrosine kinase activity;
Cellular component	cytoplasm; cell projection; membrane; ruffle; extrinsic component of cytoplasmic side of plasma membrane; nucleus; nucleoplasm; cytosol; plasma membrane; nuclear body;
Biological process	cellular response to retinoic acid; negative regulation of growth; phosphorylation; transmembrane receptor protein tyrosine kinase signaling pathway; protein phosphorylation; negative regulation of protein tyrosine kinase activity; regulation of cell population proliferation; intestinal epithelial cell differentiation; positive regulation of neuron projection development; peptidyl-tyrosine autophosphorylation; protein autophosphorylation; innate immune response; cell migration; positive regulation of cell cycle; ERBB2 signaling pathway; negative regulation of signal transduction; positive regulation of epidermal growth factor receptor signaling pathway; tyrosine phosphorylation of STAT protein; positive regulation of tyrosine phosphorylation of STAT protein; cell differentiation;
	Sources:Amigo / QuickGO
Orthologs
	5753
	20459
	ENSG00000101213
	ENSMUSG00000038751
	Q13882
	Q64434
	NM_001256358; NM_005975
	NM_009184; NM_001356304
	NP_001243287; NP_005966
	NP_033210; NP_001343233
	Wikidata
View/Edit Human	View/Edit Mouse

Tyrosine-protein kinase 6 is an enzyme that in humans is encoded by the PTK6 gene.^[5]^[6]^[7]

Function

Tyrosine-protein kinase 6—also known as BRK^[7] (breast tumor kinase)—is a cytoplasmic non-receptor protein kinase which may function as an intracellular signal transducer in epithelial tissues. The encoded protein has been shown to undergo autophosphorylation.^[7]

Clinical significance

Overexpression of this gene in mammary epithelial cells leads to sensitization of the cells to epidermal growth factor and results in a partially transformed phenotype. Expression of this gene has been detected at low levels in some breast tumors but not in normal breast tissue.^[7]

Interactions

PTK6 has been shown to interact with STAP2^[8] and KHDRBS1.^[9]

References

Serfas MS, Tyner AL (2003). "Brk, Srm, Frk, and Src42A form a distinct family of intracellular Src-like tyrosine kinases". Oncol. Res. 13 (6–10): 409–19. doi:10.3727/096504003108748438. PMID 12725532.
Mitchell PJ, Barker KT, Martindale JE, et al. (1994). "Cloning and characterisation of cDNAs encoding a novel non-receptor tyrosine kinase, brk, expressed in human breast tumours". Oncogene. 9 (8): 2383–90. PMID 8036022.
Kamalati T, Jolin HE, Mitchell PJ, et al. (1997). "Brk, a breast tumor-derived non-receptor protein-tyrosine kinase, sensitizes mammary epithelial cells to epidermal growth factor". J. Biol. Chem. 271 (48): 30956–63. doi:10.1074/jbc.271.48.30956. PMID 8940083.
Lee H, Kim M, Lee KH, et al. (1998). "Exon-intron structure of the human PTK6 gene demonstrates that PTK6 constitutes a distinct family of non-receptor tyrosine kinase". Mol. Cells. 8 (4): 401–7. doi:10.1016/S1016-8478(23)13443-1. PMID 9749526.
Llor X, Serfas MS, Bie W, et al. (1999). "BRK/Sik expression in the gastrointestinal tract and in colon tumors". Clin. Cancer Res. 5 (7): 1767–77. PMID 10430081.
Derry JJ, Richard S, Valderrama Carvajal H, et al. (2000). "Sik (BRK) Phosphorylates Sam68 in the Nucleus and Negatively Regulates Its RNA Binding Ability". Mol. Cell. Biol. 20 (16): 6114–26. doi:10.1128/MCB.20.16.6114-6126.2000. PMC 86087. PMID 10913193.
Mitchell PJ, Sara EA, Crompton MR (2000). "A novel adaptor-like protein which is a substrate for the non-receptor tyrosine kinase, BRK". Oncogene. 19 (37): 4273–82. doi:10.1038/sj.onc.1203775. PMID 10980601.
Kamalati T, Jolin HE, Fry MJ, Crompton MR (2000). "Expression of the BRK tyrosine kinase in mammary epithelial cells enhances the coupling of EGF signalling to PI 3-kinase and Akt, via erbB3 phosphorylation". Oncogene. 19 (48): 5471–6. doi:10.1038/sj.onc.1203931. PMID 11114724.
Hong E, Shin J, Bang E, et al. (2001). "Complete sequence-specific 1H, 13C and 15N resonance assignments of the human PTK6 SH2 domain". J. Biomol. NMR. 19 (3): 291–2. doi:10.1023/A:1011221125013. PMID 11330822. S2CID 20836477.
Deloukas P, Matthews LH, Ashurst J, et al. (2002). "The DNA sequence and comparative analysis of human chromosome 20". Nature. 414 (6866): 865–71. Bibcode:2001Natur.414..865D. doi:10.1038/414865a. PMID 11780052.
Kang KN, Kim M, Pae KM, Lee ST (2002). "Characterization of the 5'-flanking region of the human PTK6 gene". Biochim. Biophys. Acta. 1574 (3): 365–9. doi:10.1016/s0167-4781(02)00234-8. PMID 11997104.
Qiu H, Miller WT (2002). "Regulation of the nonreceptor tyrosine kinase Brk by autophosphorylation and by autoinhibition". J. Biol. Chem. 277 (37): 34634–41. doi:10.1074/jbc.M203877200. PMID 12121988.
Koo BK, Kim MH, Lee ST, Lee W (2002). "Purification and spectroscopic characterization of the human protein tyrosine kinase-6 SH3 domain". J. Biochem. Mol. Biol. 35 (3): 343–7. doi:10.5483/BMBRep.2002.35.3.343. PMID 12297019.
Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–903. Bibcode:2002PNAS...9916899M. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932.
Coyle JH, Guzik BW, Bor YC, et al. (2003). "Sam68 Enhances the Cytoplasmic Utilization of Intron-Containing RNA and Is Functionally Regulated by the Nuclear Kinase Sik/BRK". Mol. Cell. Biol. 23 (1): 92–103. doi:10.1128/MCB.23.1.92-103.2003. PMC 140664. PMID 12482964.
Derry JJ, Prins GS, Ray V, Tyner AL (2003). "Altered localization and activity of the intracellular tyrosine kinase BRK/Sik in prostate tumor cells". Oncogene. 22 (27): 4212–20. doi:10.1038/sj.onc.1206465. PMID 12833144.
Qiu H, Miller WT (2004). "Role of the Brk SH3 domain in substrate recognition". Oncogene. 23 (12): 2216–23. doi:10.1038/sj.onc.1207339. PMID 14676834.

v t e Enzymes
Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Diffusion-limited enzyme Cofactor Enzyme catalysis
Regulation	Allosteric regulation Cooperativity Enzyme inhibitor Enzyme activator
Classification	EC number Enzyme superfamily Enzyme family List of enzymes
Kinetics	Enzyme kinetics Eadie–Hofstee diagram Hanes–Woolf plot Lineweaver–Burk plot Michaelis–Menten kinetics
Types	EC1 Oxidoreductases (list) EC2 Transferases (list) EC3 Hydrolases (list) EC4 Lyases (list) EC5 Isomerases (list) EC6 Ligases (list) EC7 Translocases (list)

PTK6

Function

Clinical significance

Interactions

References

Further reading

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