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词条 Cyclin-dependent kinase 6
释义

  1. Structure

  2. Function

      Cell cycle    Cellular development    DNA protection    Metabolic homeostasis    Centrosome stability  

  3. Mechanisms of regulation

  4. Clinical relevance

      Cancer    Medulloblastoma    As a drug target    Interactions  

  5. See also

  6. References

  7. Further reading

  8. External links

{{Infobox_gene}}Cell division protein kinase 6 (CDK6) is an enzyme encoded by the CDK6 gene.[1][2] It is regulated by cyclins, more specifically by Cyclin D proteins and Cyclin-dependent kinase inhibitor proteins.[3] The protein encoded by this gene is a member of the cyclin-dependent kinase, (CDK) family, which includes CDK4.[3] CDK family members are highly similar to the gene products of Saccharomyces cerevisiae cdc28, and Schizosaccharomyces pombe cdc2, and are known to be important regulators of cell cycle progression in the point of regulation named R or restriction point.[4]

This kinase is a catalytic subunit of the protein kinase complex, important for the G1 phase progression and G1/S transition of the cell cycle and the complex is composed also by an activating sub-unit; the cyclin D.[6] The activity of this kinase first appears in mid-G1 phase, which is controlled by the regulatory subunits including D-type cyclins and members of INK4 family of CDK inhibitors.[3] This kinase, as well as CDK4, has been shown to phosphorylate, and thus regulate the activity of, tumor suppressor Retinoblastoma protein making CDK6 an important protein in cancer development.[6]

Structure

The CDK6 gene is conserved in eukaryotes, including the budding yeast and the nematode Caenorhabditis elegans.[5] The CDK6 gene is located on chromosome 7 in humans. The gene spans 231,706 base pairs and encodes a 326 amino acid protein with a kinase function.[2] The gene is overexpressed in cancers like lymphoma, leukemia, medulloblastoma and melanoma associated with chromosomal rearrangements.[2]

The CDK6 protein contains a catalytic core composed of a serine/threonine domain.[6] This protein also contains an ATP-binding pocket, inhibitory and activating phosphorylation sites, a PSTAIRE-like cyclin-binding domain and an activating T-loop motif.[7] After binding the Cyclin in the PSTAIRE helix, the protein changes its conformational structure to expose the phosphorylation motif.[7] The protein can be found in the cytoplasm and the nucleus, however most of the active complexes are found in the nucleus of proliferating cells.[7]

Function

Cell cycle

In 1994, Matthew Meyerson and Ed Harlow investigated the product of a close analogous gene of CDK4.[3] This gene, identified as PLSTIRE was translated into a protein that interacted with the cyclins CD1, CD2 and CD3 (same as CDK4), but that was different from CDK4; the protein was then renamed CDK6 for simplicity.[8] In mammalian cells, cell cycle is activated by CDK6 in the early G1 phase[9] through interactions with cyclins D1, D2 and D3.[8] There are many changes in gene expression that are regulated through this enzyme.[10] After the complex is formed, the C-CDK6 enzymatic complex phosphorylates the protein pRb.[11]

After its phosphorylation, pRb releases its binding partner E2F, a transcriptional activator, which in turn activates DNA replication.[12] The CDK6 complex ensures a point of switch to commit to division responding to external signals, like mitogens and growth factors.[13]

CDK6 is involved in a positive feedback loop that activates transcription factors through a reaction cascade.[14] Importantly, these C-CDK complexes act as a kinase, phosphorylating and inactivating the protein of Rb and p-Rb related “pocket proteins” p107 and p130.[15] While doing this, the CDK6 in conjunction with CDK4, act as a switch signal that first appears in G1,[8] directing the cell towards S phase of the cell cycle.[10]

CDK6 is important for the control of G1 to S phase transition.[8] However, in recent years, new evidence proved that the presence of CDK6 is not essential for proliferation in every cell type,[16] the cell cycle has a complex circuitry of regulation and the role of CDK6 might be more important in certain cell types than in others, where CDK4 or CDK2 can act as protein kinases compensating its role.[16][17]

Cellular development

In mutant Knockout mice of CDK6, the hematopoietic function is impaired, regardless of otherwise organism normal development.[16] This might hint additional roles of CDK6 in the development of blood components.[16] There are additional functions of CDK6 not associated with its kinase activity.[34] For example, CDK6 is involved in the differentiation of T cells, acting as an inhibitor of differentiation.[18] Even though CDK6 and CDK4 share 71% amino acid identity, this role in differentiation is unique to CDK6.[18] CDK6 has also been found to be important in the development of other cell lines, for example, CDK6 has a role in the alteration of the morphology of astrocytes[19] and in the development of other stem cells.[7][12]

DNA protection

CDK6 differs from CDK4 in other important roles.[40] For example, CDK6 plays a role in the accumulation of the apoptosis proteins p53 and p130, this accumulation keeps cells from entering cell division if there is DNA damage, activating pro- apoptotic pathways.[20]

Metabolic homeostasis

Studies in the metabolic control of cells have revealed yet another role of CDK6.[42] This new role is associated with the balance of the oxidative and non-oxidative branches of the pentose pathway in cells.[42] This pathway is a known route altered in cancer cells, when there is an aberrant overexpression of CDK6 and CDK4.[42] The overepression of these proteins provides the cancer cells with a new hallmark capability of cancer; the deregulation of the cell metabolism.[21]

Centrosome stability

In 2013 researches discovered yet another role of CDK6.[46] There is evidence that CDK6 associates with the centrosome and controls organized division and cell cycle phases in neuron production.[46] When the CDK6 gene is mutated in these developing lines, the centrosomes are not properly divided, this could lead to division problems such as aneuploidy, which in turns leads to health issues like primary microcephaly.[22]

Mechanisms of regulation

CDK6 is positively regulated primarily by its union to the D cyclins D1,D2 and D3. If this subunit of the complex is not available, CDK6 is not active or available to phosphorylate the pRb substrate.[4] An additional positive activator needed by CDK6 is the phosphorylation in a conserved threonine residue located in 177 position, this phosphorylation is done by the cdk-activating kinases, CAK.[23] Additionally, CDK6 can be phosphorylated and activated by the Kaposi's sarcoma-associated herpes virus, stimulating the CDK6 over activation and uncontrolled cell proliferation.[24]

CDK6 is negatively regulated by binding to certain inhibitors that can be classified in two groups;[25] CKIs or CIP/KIP family members like the protein p21[12] and p27 act blocking and inhibiting the assembled C-CDKs binding complex enzymes[23] in their catalytic domain.[26]

Furthermore, inhibitors of the INK4 family members like p15, p16, p18 and p19 inhibit the monomer of CDK6, preventing the complex formation.[15][27]

Clinical relevance

CDK6 is a protein kinase activating cell proliferation, it is involved in an important point of restriction in the cell cycle.[14] For this reason, CDK6 and other regulators of the G1 phase of the cell cycle are known to be unbalanced in more than 80-90% of tumors.[4] In cervical cancer cells, CDK6 function has been shown to be altered indirectly by the p16 inhibitor.[27] CDK6 is also overexpressed in tumors that exhibit drug resistance, for example glioma malignancies exhibit resistance to chemotherapy using temozolomide (TMZ) when they have a mutation overexpressing CDK6.[28] Likewise, the overexpression of CDK6 is also associated with resistance to hormone therapy using the anti oestrogen Fluvestrant in breast cancer.[29]

Cancer

Loss of normal cell cycle control is the first step to developing different hallmarks of cancer; alterations of CDK6 can directly or indirectly affect the following hallmarks; disregulated cell cellular energetics, sustaining of proliferative signaling, evading growth suppressors and inducing angiogenesis,[4] for example, deregulation of CDK6 has been shown to be important in lymphoid malignancies by increasing angiogenesis, a hallmark of cancer.[15] These features are reached through upregulation of CDK6 due to chromosome alterations or epigenetic dysregulations.[4] Additionally, CDK6 might be altered through genomic instability, a mechanism of downregulation of tumor suppressor genes; this represents another evolving hallmark of cancer.[30]

Medulloblastoma

Medulloblastoma is the most common cause of brain cancer in children.[67] About a third of these cancers have upregulated CDK6, representing a marker for poor prognosis for this disease.[67] Since it is so common for these cells to have alterations in CDK6, researchers are seeking for ways to downregulate CDK6 expression acting specifically in those cell lines. The MicroRNA (miR) -124 has successfully controlled cancer progression in an in-vitro setting for medulloblastoma and glioblastoma cells.[67] Furthermore, researchers have found that it successfully reduces the growth of xenograft tumors in rat models.[67]

As a drug target

{{further|CDK inhibitor}}Palbociclib and Ribociclib are FDA approved inhibitors of CDK4 and CDK6. Ribociclib is approved in combination with letrozole for treatment of breast cancer in patients with a hormone receptor positive, HER2 negative advanced metastatic breast cancer.[31] A phase three clinical trial found that Ribocyclib administered in combination with letrozole increased the likelihood of progression free survival to 63% in the first 18 months of therapy versus 42% for letrozole alone.[32] Subsequent analysis demonstrated that patients treated with Ribociclib and letrozole showed a median progression-free survival of 25.3 months.[31] Inhibitors of CDK6 have shown the disadvantage of having low specificity for CDK6 over other CDKs, and as a consequence they might act inhibiting other CDKs that are crucial in other tissues and at other points of cell cycle.[33] The compound PD-0332991, is currently under more than 20 clinical trials acting either as single agent or as coadjuvant of other therapies in clinical trial phase I-III showing promising results in the control of breast cancer in-vitro.[34]

The direct targeting of CDK6 and CDK4 should be used with caution in the treatment of cancer, because these enzymes are important for the cell cycle of normal cells as well.[35] Furthermore, small molecules targeting these proteins might increase drug resistance events.[35] However, these kinases have been shown to be useful as coadjuvants in breast cancer chemotherapy.[36]

Another indirect mechanism for the control of CDK6 expression, is the use of a mutated D-cyclin that binds with high affinity to CDK6, but does not induce its kinase activity.[36] this mechanism was studied in the development of mammary tumorigenesis in rat cells, however, the clinical effects have not yet been shown in human patients.[36]

A

Interactions

Cyclin-dependent kinase 6 interacts with:

{{div col|colwidth=20em}}
  • CDKN2C,[37][38][39]
  • Cyclin D1,[84][40]
  • Cyclin D3,[41][42]
  • P16,[43][44][45]
  • PPM1B,[46] and
  • PPP2CA.[46]
{{Div col end}}

See also

Cell cycle, Mitosis, CDK, CDK4, Hallmarks of cancer

[https://www.genecards.org/cgi-bin/carddisp.pl?gene=CDK6 Genecards]

[https://www.uniprot.org/uniprot/?query=cdk6&sort=score Uniprot]

NCI

References

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44. ^{{cite journal | vauthors = Russo AA, Tong L, Lee JO, Jeffrey PD, Pavletich NP | title = Structural basis for inhibition of the cyclin-dependent kinase Cdk6 by the tumour suppressor p16INK4a | journal = Nature | volume = 395 | issue = 6699 | pages = 237–43 | date = Sep 1998 | pmid = 9751050 | doi = 10.1038/26155 }}
45. ^{{cite journal | vauthors = Kaldis P, Ojala PM, Tong L, Mäkelä TP, Solomon MJ | title = CAK-independent activation of CDK6 by a viral cyclin | journal = Molecular Biology of the Cell | volume = 12 | issue = 12 | pages = 3987–99 | date = Dec 2001 | pmid = 11739795 | pmc = 60770 | doi = 10.1091/mbc.12.12.3987}}
46. ^1 {{cite journal | vauthors = Cheng A, Kaldis P, Solomon MJ | title = Dephosphorylation of human cyclin-dependent kinases by protein phosphatase type 2C alpha and beta 2 isoforms | journal = The Journal of Biological Chemistry | volume = 275 | issue = 44 | pages = 34744–9 | date = Nov 2000 | pmid = 10934208 | doi = 10.1074/jbc.M006210200 }}

Further reading

{{refbegin|35em}}
  • {{cite journal | vauthors = Adams MD, Kerlavage AR, Fleischmann RD, Fuldner RA, Bult CJ, Lee NH, Kirkness EF, Weinstock KG, Gocayne JD, White O | title = Initial assessment of human gene diversity and expression patterns based upon 83 million nucleotides of cDNA sequence | journal = Nature | volume = 377 | issue = 6547 Suppl | pages = 3–174 | date = Sep 1995 | pmid = 7566098 | doi = | url = http://www.columbia.edu/itc/biology/pollack/w4065/client_edit/readings/nature377_3.pdf }}
  • {{cite journal | vauthors = Aprelikova O, Xiong Y, Liu ET | title = Both p16 and p21 families of cyclin-dependent kinase (CDK) inhibitors block the phosphorylation of cyclin-dependent kinases by the CDK-activating kinase | journal = The Journal of Biological Chemistry | volume = 270 | issue = 31 | pages = 18195–7 | date = Aug 1995 | pmid = 7629134 | doi = 10.1074/jbc.270.31.18195 }}
  • {{cite journal | vauthors = Lucas JJ, Szepesi A, Modiano JF, Domenico J, Gelfand EW | title = Regulation of synthesis and activity of the PLSTIRE protein (cyclin-dependent kinase 6 (cdk6)), a major cyclin D-associated cdk4 homologue in normal human T lymphocytes | journal = Journal of Immunology | volume = 154 | issue = 12 | pages = 6275–84 | date = Jun 1995 | pmid = 7759865 | doi = }}
  • {{cite journal | vauthors = Bullrich F, MacLachlan TK, Sang N, Druck T, Veronese ML, Allen SL, Chiorazzi N, Koff A, Heubner K, Croce CM | title = Chromosomal mapping of members of the cdc2 family of protein kinases, cdk3, cdk6, PISSLRE, and PITALRE, and a cdk inhibitor, p27Kip1, to regions involved in human cancer | journal = Cancer Research | volume = 55 | issue = 6 | pages = 1199–205 | date = Mar 1995 | pmid = 7882308 | doi = }}
  • {{cite journal | vauthors = Guan KL, Jenkins CW, Li Y, Nichols MA, Wu X, O'Keefe CL, Matera AG, Xiong Y | title = Growth suppression by p18, a p16INK4/MTS1- and p14INK4B/MTS2-related CDK6 inhibitor, correlates with wild-type pRb function | journal = Genes & Development | volume = 8 | issue = 24 | pages = 2939–52 | date = Dec 1994 | pmid = 8001816 | doi = 10.1101/gad.8.24.2939 }}
  • {{cite journal | vauthors = Meyerson M, Harlow E | title = Identification of G1 kinase activity for cdk6, a novel cyclin D partner | journal = Molecular and Cellular Biology | volume = 14 | issue = 3 | pages = 2077–86 | date = Mar 1994 | pmid = 8114739 | pmc = 358568 | doi = 10.1128/MCB.14.3.2077}}
  • {{cite journal | vauthors = Fåhraeus R, Paramio JM, Ball KL, Laín S, Lane DP | title = Inhibition of pRb phosphorylation and cell-cycle progression by a 20-residue peptide derived from p16CDKN2/INK4A | journal = Current Biology | volume = 6 | issue = 1 | pages = 84–91 | date = Jan 1996 | pmid = 8805225 | doi = 10.1016/S0960-9822(02)00425-6 }}
  • {{cite journal | vauthors = Bonaldo MF, Lennon G, Soares MB | title = Normalization and subtraction: two approaches to facilitate gene discovery | journal = Genome Research | volume = 6 | issue = 9 | pages = 791–806 | date = Sep 1996 | pmid = 8889548 | doi = 10.1101/gr.6.9.791 }}
  • {{cite journal | vauthors = Lamphere L, Fiore F, Xu X, Brizuela L, Keezer S, Sardet C, Draetta GF, Gyuris J | title = Interaction between Cdc37 and Cdk4 in human cells | journal = Oncogene | volume = 14 | issue = 16 | pages = 1999–2004 | date = Apr 1997 | pmid = 9150368 | doi = 10.1038/sj.onc.1201036 }}
  • {{cite journal | vauthors = Nagasawa M, Melamed I, Kupfer A, Gelfand EW, Lucas JJ | title = Rapid nuclear translocation and increased activity of cyclin-dependent kinase 6 after T cell activation | journal = Journal of Immunology | volume = 158 | issue = 11 | pages = 5146–54 | date = Jun 1997 | pmid = 9164930 | doi = }}
  • {{cite journal | vauthors = Ezhevsky SA, Nagahara H, Vocero-Akbani AM, Gius DR, Wei MC, Dowdy SF | title = Hypo-phosphorylation of the retinoblastoma protein (pRb) by cyclin D:Cdk4/6 complexes results in active pRb | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 94 | issue = 20 | pages = 10699–704 | date = Sep 1997 | pmid = 9380698 | pmc = 23451 | doi = 10.1073/pnas.94.20.10699 }}
  • {{cite journal | vauthors = Fåhraeus R, Laín S, Ball KL, Lane DP | title = Characterization of the cyclin-dependent kinase inhibitory domain of the INK4 family as a model for a synthetic tumour suppressor molecule | journal = Oncogene | volume = 16 | issue = 5 | pages = 587–96 | date = Feb 1998 | pmid = 9482104 | doi = 10.1038/sj.onc.1201580 }}
  • {{cite journal | vauthors = Gonzales AJ, Goldsworthy TL, Fox TR | title = Chemical transformation of mouse liver cells results in altered cyclin D-CDK protein complexes | journal = Carcinogenesis | volume = 19 | issue = 6 | pages = 1093–102 | date = Jun 1998 | pmid = 9667749 | doi = 10.1093/carcin/19.6.1093 }}
  • {{cite journal | vauthors = Russo AA, Tong L, Lee JO, Jeffrey PD, Pavletich NP | title = Structural basis for inhibition of the cyclin-dependent kinase Cdk6 by the tumour suppressor p16INK4a | journal = Nature | volume = 395 | issue = 6699 | pages = 237–43 | date = Sep 1998 | pmid = 9751050 | doi = 10.1038/26155 }}
  • {{cite journal | vauthors = Brotherton DH, Dhanaraj V, Wick S, Brizuela L, Domaille PJ, Volyanik E, Xu X, Parisini E, Smith BO, Archer SJ, Serrano M, Brenner SL, Blundell TL, Laue ED | title = Crystal structure of the complex of the cyclin D-dependent kinase Cdk6 bound to the cell-cycle inhibitor p19INK4d | journal = Nature | volume = 395 | issue = 6699 | pages = 244–50 | date = Sep 1998 | pmid = 9751051 | doi = 10.1038/26164 }}
  • {{cite journal | vauthors = Jiang W, Wells NJ, Hunter T | title = Multistep regulation of DNA replication by Cdk phosphorylation of HsCdc6 | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 96 | issue = 11 | pages = 6193–8 | date = May 1999 | pmid = 10339564 | pmc = 26858 | doi = 10.1073/pnas.96.11.6193 }}
  • {{cite journal | vauthors = Yarbrough WG, Buckmire RA, Bessho M, Liu ET | title = Biologic and biochemical analyses of p16(INK4a) mutations from primary tumors | journal = Journal of the National Cancer Institute | volume = 91 | issue = 18 | pages = 1569–74 | date = Sep 1999 | pmid = 10491434 | doi = 10.1093/jnci/91.18.1569 }}
  • {{cite journal | vauthors = Harbour JW, Luo RX, Dei Santi A, Postigo AA, Dean DC | title = Cdk phosphorylation triggers sequential intramolecular interactions that progressively block Rb functions as cells move through G1 | journal = Cell | volume = 98 | issue = 6 | pages = 859–69 | date = Sep 1999 | pmid = 10499802 | doi = 10.1016/S0092-8674(00)81519-6 }}
  • {{cite journal | vauthors = Grossel MJ, Baker GL, Hinds PW | title = cdk6 can shorten G(1) phase dependent upon the N-terminal INK4 interaction domain | journal = The Journal of Biological Chemistry | volume = 274 | issue = 42 | pages = 29960–7 | date = Oct 1999 | pmid = 10514479 | doi = 10.1074/jbc.274.42.29960 }}
{{refend}}

External links

  • {{MeshName|Cyclin-Dependent+Kinase+6}}
  • {{UCSC genome browser|CDK6}}
  • {{UCSC gene details|CDK6}}
{{PDB Gallery|geneid=1021}}{{Cell cycle proteins}}{{Serine/threonine-specific protein kinases}}{{Enzymes}}{{Portal bar|Molecular and Cellular Biology|border=no}}{{DEFAULTSORT:Cyclin-dependent kinase 06}}

3 : Cell cycle|Proteins|EC 2.7.11
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