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Cyclin-dependent kinase 5 (Cdk5) and neuron-specific Cdk5 activators

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Progress in Cell Cycle Research

Part of the book series: Progress in Cell Cycle Research ((PCCR))

Abstract

While cyclin-dependent kinase 5 (Cdk5) is widely distributed in mammalian tissues and in cultured cell lines, Cdk5-associated kinase activity has been demonstrated only in mammalian brains. An active form of Cdk5, called neuronal cdc2-like kinase (Nclk) has been purified from mammalian brain and shown to be a heterodimer of Cdk5 and a 25 kDa protein, which is derived proteolytically from a 35 kDa brain and neuron-specific protein. The protein is essential for the kinase activity of Cdk5 and is therefore designated neuronal Cdk5 activator, p25/35Nck5a. Nclk appears to have important neuronal functions. The changes in Cdk5 and Nck5a expression appear to correlate with the terminal differentiation of neurons of the mouse embryonic brain. Transfection of cultured cortical neurons with dominant negative cdk5 mutants or Nck5a antisense DNA may reduce neurite growth, suggesting that Nclk plays an active role in neuron differentiation. A number of cytoskeletal proteins including neurofilament proteins, the neuron-specific microtubule associated protein tau, and the actin binding protein caldesmon are in vitro substrates of Nclk. Although Nck5a has cyclin-like activity, it shows minimal amino acid sequence identity to members of cyclin family proteins. The mechanism of activation of Cdk5 by Nck5a differs from that of cyclin activation of Cdks in that full Cdk5 kinase activity can be achieved in the absence of phosphorylation of Cdk5. An isoform of Nck5a, a 39 kDa protein has been cloned and shown to share extensive amino acid identity and the mechanism of Cdk5 activation with Nck5a. These proteins may represent a subfamily of Cdk activators distinct from cyclins.

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References

  1. Draetta, G. (1990) Trends Biochem. Sci. 15, 378–383.

    PubMed  CAS  Google Scholar 

  2. Murray, A.W. and Kirschner, M.W. (1989) Science 246, 614–621.

    PubMed  CAS  Google Scholar 

  3. Hunt, T. (1989). Curr. Opin. Cell. Biol. 1, 268–274.

    PubMed  CAS  Google Scholar 

  4. Pines, J. and Hunter, T. (1990) New Biol. 2, 389–401.

    PubMed  CAS  Google Scholar 

  5. Massague, J. and Roberts, J.M. (1995) Curr. Opin. Cell Biol. 7, 769–772.

    PubMed  CAS  Google Scholar 

  6. Nurse, P., (1990) Nature 344, 503–507.

    PubMed  CAS  Google Scholar 

  7. Pines, J. (1992) Curr. Opin. Cell. Biol. 4, 144–148.

    PubMed  CAS  Google Scholar 

  8. Pines, J. (1994) Can. Biol. 15, 305–313.

    Google Scholar 

  9. Hunt, T. and Kirschner, M. (1993) Curr. Opin. Cell. Biol. 5, 163–165.

    PubMed  CAS  Google Scholar 

  10. Matsushita, M., Matsui, H., Itano, T., Tomizawa, K., Tokuda, M., Suwaki, H., Wang, J.H., and Hatase, O. (1995) NeuroReport 6, 1267–1270.

    PubMed  CAS  Google Scholar 

  11. Tomizawa, K., Matsui, H., Matsushita, M., Lew, J., Tokuda, M., Itano, T., Konishi, R., Lew, J., Tokuda, M., Itano, T., Konishi, R., Wang, J.H., and Hatas, O. (1996) In Press.

    Google Scholar 

  12. Tsai, L.-H., Takahashi, T., Caviness Jr, V.S., and Harlow, Ed (1993) Development 119, 1029–1040.

    Google Scholar 

  13. Nikolic, M., Dudek, H., Kwon, Y.T., Ramos, Y.F.M., and Tsai, L.-H. (1996) Genes and Development 10, 816–825.

    PubMed  CAS  Google Scholar 

  14. Hellmich, M.R. Pant, H.C., Wada, E., and Battey, J.F. (1992) Proc. Natl. Acad. Sci. USA 89, 10867–10871.

    PubMed  CAS  Google Scholar 

  15. Hayes, T.E., Valtz, N.L.M., and McKay, R.D.G. (1991) New Biol. 3, 259–269.

    PubMed  CAS  Google Scholar 

  16. Ishiguro et al. (1988) J. Biochem. 104, 319–321.

    PubMed  CAS  Google Scholar 

  17. Ishiguro, K., Takamatsu, M., Tomizawa, K., Omori, A., Takahashi, M., Arioka, M., Uchida, T., and Imahori, K. (1992) J. Biol. Chem. 267, 10897–10901.

    PubMed  CAS  Google Scholar 

  18. Lew, J., Beaudette, K., Litwin, C.M.E., and Wang, J.H. (1992a) J. Biol. Chem. 267, 13383–13390.

    PubMed  CAS  Google Scholar 

  19. Lew, J., Huang, Q.-Q., Qi, Z., Winkfein, R.J., Aebersold, R., Hunt, T., and Wang, J.H. (1994) Nature 371, 423–426.

    PubMed  CAS  Google Scholar 

  20. Tsai, L.-H., Delalle, I., Caviness Jr, V.S., Chae, T., and Harlow, Ed (1994) Nature 371, 419–423.

    PubMed  CAS  Google Scholar 

  21. Ishiguro, K., Kobayashi, S., Omori, A., Takamatsu, M., Yonekura, S., Anzai, K., Imahori, K., and Uchida, T. (1994) FEBS Lett. 342, 203–208.

    PubMed  CAS  Google Scholar 

  22. Lew, J., Winkfein, R.J., Paudel, H.K., and Wang, J.H. (1992b) J. Biol. Chem. 267, 25922–25926.

    PubMed  CAS  Google Scholar 

  23. Kobayashi, S., Ishiguro, K., Omori, A., Takamatsu, M., Arioka, M., Imahori, K., and Uchida, T. (1993) FEBS Lett. 335, 171–175.

    PubMed  CAS  Google Scholar 

  24. Uchida, T., Ishiguro, K., Ohnuma, J., Takamatsu, M., Yonekura, S., and Imahori, K. (1994) FEBS Lett. 355, 35–40.

    PubMed  CAS  Google Scholar 

  25. Lew, J., Qi, Z., Huang, Q.-Q., Paudel, H., Matsuura, I., Matsushita, M., Zhu, X., and Wang, J.H. (1995) Neurobiol. Aging 16, 263–270.

    PubMed  CAS  Google Scholar 

  26. Beaudette, K.N., Lew, J., and Wang, J.H. (1993) J. Biol. Chem. 268, 20825–20830.

    PubMed  CAS  Google Scholar 

  27. Vesely, J., Havlicek, L., Strnad, M., Blow, J.J., Donella-Deana, A., Pinna, L., Letham, D.S., Kato, J.-Y., Detivaud, L., Leclerc, S., and Meijer, L. (1994) Eux. J. Biochem. 224, 771–786.

    CAS  Google Scholar 

  28. Shetty, K.T., Link, W.T., and Pant, H.C. (1993) Proc. Natl. Acad. Sci. USA 90, 6844–6848.

    PubMed  CAS  Google Scholar 

  29. Meyerson, M., Enders, G.H., Wu, C.-L., Su, L.-K., Gorka, C., Nelson, C., Harlow, Ed, and Tsai, L.-H. (1992) EMBO J. 11, 2909–2917.

    PubMed  CAS  Google Scholar 

  30. Xiong, Y., Zhang, H., and Beach, D. (1992) Cell 71, 505–514.

    PubMed  CAS  Google Scholar 

  31. Demetrick, D.J., Zhang, H., and Beach D.H. (1994) Cytogenet. Cell Genet. 66, 72–74.

    PubMed  CAS  Google Scholar 

  32. Ohshima, T., Nagle, J.W., Pant, H.C., Joshi, J.B., Kozak, C.A., Brady, R.O., and Kulkarni, A.B. (1995) Genomics 28, 585–588.

    PubMed  CAS  Google Scholar 

  33. Ishizuka, T., Ino, H., Sawa, K., Suzuki, N., and Tatibana, M. (1995) Gene 66, 267–271.

    Google Scholar 

  34. Hellmich, M.R., Kennison, J.A, Hampton, L.L., and Battey, J.F. (1994) FEBS Lett. 356, 317–321.

    PubMed  CAS  Google Scholar 

  35. Lee, K.-Y., Rosales, J.L., Tang, D., and Wang, J.H. (1996) J. Biol. Chem. 271, 1538–1542.

    PubMed  CAS  Google Scholar 

  36. Qi, Z., Huang, Q.-Q., Lee, K.-Y., Lew, J., and Wang, J.H. (1995a) J. Biol. Chem. 270, 10847–10854.

    PubMed  CAS  Google Scholar 

  37. Tang, D., Yeung, J., Lee, K.-Y., Matsushita, M., Matsui, H., Tomizawa, K., Hatase, O., and Wang, J.H. (1995) J. Biol. Chem. 270, 26897–26903.

    PubMed  CAS  Google Scholar 

  38. Huang, Q.-Q., Lee, K.-Y, and Wang, J.H. (1996) FEBS Lett. 378, 48–50.

    PubMed  CAS  Google Scholar 

  39. Hengartner, C.J., Thompson, M.C., Zhang, J., Chao, D.M., Liao, S.-M., Koleske, A.J., Okamura, S., and Young, R.A. (1995) Genes and Development 9, 897–910.

    PubMed  CAS  Google Scholar 

  40. Tassan, J.P., Jaquenoud, M., Leopold, P., Schultz, S.J. and Nigg, E.A. (1995) Proc. Natl. Acad. Sci. USA 92, 8871–8875.

    PubMed  CAS  Google Scholar 

  41. Maldonado, E., Shiekhattar, R., Sheldon, M., Cho, H., Drapkin, R., Richert, P., Lees, E., Anderson, C.W., Linn, S., and Reinberg, D. (1996) Nature 381, 86–89.

    PubMed  CAS  Google Scholar 

  42. Chao, D.M., Gadbois, E.L., Murray, P.J., Anderson, S.F., Sonu, M.S., Parvin, J.D., and Young, R.A. (1996) Nature 380, 82–85.

    PubMed  CAS  Google Scholar 

  43. Jeffrey, P.D., Russo, A.A., Polyak, K., Gibbs, E., Hurwitz, J., Massague, J., and Pavletich, N.P. (1995) Nature 376, 313–320.

    PubMed  CAS  Google Scholar 

  44. Brown, NR, Noble, M., Endicott, JA, Garman, EF, Wakatsuki, S., Mitchell, E., Rasmussen, B., Hunt, T., and Johnson, LN (1995) Structure 3, 1235–1247.

    PubMed  CAS  Google Scholar 

  45. Solomon, M.J., Harper, J.W., and Shuttleworth, J. (1993) EMBO J. 12, 3133–3142.

    PubMed  CAS  Google Scholar 

  46. Poon, R.Y.C., Yamashita, K., Adamczewski, J.P., Hunt, T., and Shuttleworth, J. (1993). EMBO J. 12, 3123–3132.

    PubMed  CAS  Google Scholar 

  47. Fesquet, D., Labbe, J.C., Derancourt, J., Capony, J.P., Galas, S., Girard, F., Lorca, T., Shuttleworh, J., Doree, M., and Cavadore, J.C. (1993) EMBO J. 12, 3111–3121.

    PubMed  CAS  Google Scholar 

  48. Fisher, R.P. and Morgan, D.O. (1994) Cell. 78, 713–724.

    PubMed  CAS  Google Scholar 

  49. Kato, J.-Y., Matsuoka, M., Strom, D.K., and Sherr, C.J. (1994) Mol. Cell. Biol. 14, 2713–2721.

    PubMed  CAS  Google Scholar 

  50. Devault, A., Martinez, A.-M., Fesquet, D., Labbe, J.-C., Morin, N, Tassan, J.P., Nigg, E.A., Cavadore, J.-C., and Doree, M. (1995) EMBO J. 14, 5027–5036.

    PubMed  CAS  Google Scholar 

  51. Ino, H., Ishizuka, T., Chiba, T., and Tatibana, M. (1994) Brain Research 661, 196–206.

    PubMed  CAS  Google Scholar 

  52. Shetty, K.T., Kaech, S., Link, W.T., Jaffe, H., Flores, C.M., Wray, S., Pant, H.C., and Beushausen, S. (1995) J. Neurochem. 64, 1988–1995.

    PubMed  CAS  Google Scholar 

  53. Paudel, H. K., Lew, J., Ali, Z., and Wang, J.H. (1993) J. Biol. Chem. 268, 23512–23518.

    PubMed  CAS  Google Scholar 

  54. Nixon, R.A. and Sihag, R.K. (1991) TINS 14, 501–506.

    PubMed  CAS  Google Scholar 

  55. Mandelkow, E.-M. and Mandelkow, E. (1993) Trends Biochem. Sci. 18, 480–483.

    PubMed  CAS  Google Scholar 

  56. Hasegawa, M., Morishima-kawashima, M., Takio, K., Suzuki, M., Titani, K., and Ihara, Y. (1992) J. Biol. Chem. 267, 17047–17054.

    PubMed  CAS  Google Scholar 

  57. Hisanaga, S., Kusubata, M., Okumura, E., and Kishimoto, T. (1991) J. Biol. Chem. 266, 21798–21803.

    PubMed  CAS  Google Scholar 

  58. Guan, R.G., Hall, F.L., and Cohlberg, J.A. (1992) J. Neurochem. 58, 1365–1371.

    PubMed  CAS  Google Scholar 

  59. Mawal-Dewan, M., Sen, P.C., Abdel-Ghany, M., Shalloway, D., and Racker, E. (1992) J. Biol. Chem. 267, 19705–19709.

    PubMed  CAS  Google Scholar 

  60. Vulliet, R., Halloran, S., Braun, R., Smith, A., and Lee, G. (1992) J. Biol. Chem. 267, 22570–22574.

    PubMed  CAS  Google Scholar 

  61. Ishiguro, K., Omori, A., Sato, K., Tomizawa, K., Imahori, K., and Uchida, T. (1991) Neurosci. Lett. 128, 195–198.

    PubMed  CAS  Google Scholar 

  62. Baumann, K., Mandelkow, E.-M., Biernat, J., Piwnica-Worms, H., Mandelkow, E. (1993) FEBS Lett. 336, 417–424.

    PubMed  CAS  Google Scholar 

  63. Hosoi, T., Uchiyama, M., Okumura, E., Saito, T., Ishiguro, K., Uchida, T., Okuyama, A., Kishimoto, T., and Hisanaga, S.-I. (1995) J. Biochem. 117, 741–749.

    PubMed  CAS  Google Scholar 

  64. Mandelkow, E.-M., Biernat, J., Drewes, G., Gustke, N., Trinczek, B., and Mandelkow, E. (1995) Neurobiology of Aging 16, 355–363.

    PubMed  CAS  Google Scholar 

  65. Lee, V.M.Y., Balin, B.J.; Otvos, L., and Trojanowski, J.Q. (1991) Science 251, 675–678.

    PubMed  CAS  Google Scholar 

  66. Himmler, A., Drechsel, D., Kirschner, M., and Martin, D. (1989) Mol. Cel. Biol. 9, 1381–1388.

    CAS  Google Scholar 

  67. Goedert, M., Spillantini, M., Jakes, R., Rutherford, D., and Crowther, R.A. (1989) Neuron 3, 519–526.

    PubMed  CAS  Google Scholar 

  68. Goedert, M., Crowther, R.A., and Garner, C.C. (1991) TINS 14, 193–199.

    PubMed  CAS  Google Scholar 

  69. Ksiezak-Reding, H., Liu, W.K., and Yen, S.H. (1992) Brain Res. 597, 209–219.

    PubMed  CAS  Google Scholar 

  70. Knops, J., Kosik, K.S., Lee, G., Pardee, J.D., Cohen-Gould, L., and McConlogue, L. (1991) J. Cell. Biol. 114, 725–735.

    PubMed  CAS  Google Scholar 

  71. Kosik, K.S., and Greenberg, S.M. (1994) in Alzheimer Disease.(R.D. Terry, R. Katzman, and K.L. Bick, eds.) Raven Press. New York, 335–344.

    Google Scholar 

  72. Anderton, B.H. (1993) Hippocampus 3, 227–237.

    PubMed  Google Scholar 

  73. Will, H., Drewes, G., Biernat, J., Mandelkow, E.M., and Mandelkow, E. (1992) J. Cell. Biol. 118, 573–584.

    Google Scholar 

  74. Crowther, R.A., Olesen, O.F., Jakes, R., and Goedert, M. (1992) FEBS Lett. 309, 199–202.

    PubMed  CAS  Google Scholar 

  75. Kosik, K.S. (1992) Science 256, 780–783.

    PubMed  CAS  Google Scholar 

  76. Drewes, G., Lichtenberg-Kraag, B., Doring, F., Mandelkow, E.-M., Biernat, J., Goris, J., Doree, M., and Mandeklow, E. (1992) EMBO J. 11, 2131–2138.

    PubMed  CAS  Google Scholar 

  77. Mandelkow, E.-M., Drewes, G., Biernat, J., Gustke, N., Van Lint, J., Vandenheede, J.R., and Mandelkow, E., (1992) FEBS Lett. 3, 314–321.

    Google Scholar 

  78. Liem, R.K.H. (1993) Curr. Opin. Cell. Biol. 5, 12–16.

    PubMed  CAS  Google Scholar 

  79. Steinert, P.M. and Roop, D.R. (1988) Annu. Rev. Biochem. 57, 593–625.

    PubMed  CAS  Google Scholar 

  80. Pant, H.C. and Veeranna (1995) Biochem. Cell. Biol. 73, 575–592.

    PubMed  CAS  Google Scholar 

  81. Shaw, G. (1991) in The Neuronal Cytoskeleton, (Burgoyne, R.D. ed.) New York, 186–214.

    Google Scholar 

  82. Fliegner, K.H. and Liem, R.K.H. (1991) Int, Rev. Cytol. 131, 109–167.

    CAS  Google Scholar 

  83. Parry, D.A.D. and Steinert, P.M. (1992) Curr. Opin. Cell Biol. 4, 94–98.

    PubMed  CAS  Google Scholar 

  84. Gill, S.R., Wong, P.C., Monteiro, M.J., and Cleveland, D.W. (1990) J. Cell. Biol. 111, 2005–2019.

    PubMed  CAS  Google Scholar 

  85. Sihag, R.K. and Nixon, R.A. (1989) J. Biol. Chem. 264, 457–464.

    PubMed  CAS  Google Scholar 

  86. Sihag, R.K. and Nixon, R.A. (1990) J. Biol. Chem. 265, 4166–4171.

    PubMed  CAS  Google Scholar 

  87. Sihag, R.H. and Nixon, R.A. (1991) J. Biol. Chem. 266, 18861–18867.

    PubMed  CAS  Google Scholar 

  88. Hisanaga, S., Gonda, Y., Inagaki, M., Ikai, A., and Hirokawa, N. (1990) Cell. Regul. 1, 237–248.

    PubMed  CAS  Google Scholar 

  89. Nakamura, Y., Takeda, M., Angelides, H.J., Tanaka, T., Tada, K., and Nishimura, T. (1990) Biochem. Biophys. Res. Commun. 169, 744–750.

    PubMed  CAS  Google Scholar 

  90. Dosemeci, A., Floyd, C., and Pant, H.C. (1990) Cell. Mol. Neurobiol. 10, 369–382.

    PubMed  CAS  Google Scholar 

  91. Dosemeci, A. and Pant, H.C. (1992) Biochem. J. 282, 477–481.

    PubMed  CAS  Google Scholar 

  92. Pant, H.C. (1990) in Advances in Physiological Sciences.(Manchanda, S.K., Murthy, W.S., and Mohankumar, V. eds.) MacMillan India Ltd., Delhi, pp. 96–100.

    Google Scholar 

  93. Lee, V.M.Y., Carden, M., Schlaepfer, W., and Trojanski, J. (1987) J. Neurosa. 7, 3474–3488.

    CAS  Google Scholar 

  94. Lee, V.M.Y., Otvos., L., Carden, M.J., Hollosi, M., Dietzschold, B., and Lazzarini, R.A. (1988) Proc. Natl. Acad. Sci. USA 85, 1998–2002.

    PubMed  CAS  Google Scholar 

  95. Xu, Z.-S., Liu, W.-S., and Willard, M.B. (1992) J. Biol. Chem. 267, 4467–4471.

    PubMed  CAS  Google Scholar 

  96. Elhanany, E., Jaffe, H., Link, W.T., Sheeley, D.M., Gainer, H., and Pant, H.C. (1994) J. Neurochem. 63, 2324–2335.

    PubMed  CAS  Google Scholar 

  97. Qi, Z., Tang, D., Matsuura, I., Lee, K.-Y., Zhu, X., Huang, Q.-Q., and Wang, J.H. (1995b) Mol. Cell. Biochem. 149(150), 35–39.

    PubMed  Google Scholar 

  98. Miyasaka H., Okabe, S., Ishiguro, K., Uchida, T., and Hirokawa, N. (1993) J. Biol. Chem. 268, 22695–22702.

    PubMed  CAS  Google Scholar 

  99. Lasek, R.J., Garner, J.A., and Brady, S.T. (1984) J. Cell. Biol. 99, 212s-221s.

    Google Scholar 

  100. Hollenbeck, P.J. (1989) J. Cell. Biol. 108, 223–227.

    PubMed  CAS  Google Scholar 

  101. Ksiezak-Reding, H., and Yen, S.H. (1987) J. Neurosci. 7, 3554–3560.

    PubMed  CAS  Google Scholar 

  102. Waegh, S.M.D., Lee, V.M-Y., and Brady, S.T. (1992) Cell. 68, 451–463.

    PubMed  Google Scholar 

  103. Harper, J.W., Elledge, S.J., Keyomarsi, K., Dynlacht, B., Tsai, L.-H., Zhang, P., Dobrowolski, S., Bai, C., Connell-Crowley, L., Swindell, E., Fox, M.P., and Wei, N. (1995) Mol. Biol. Cell. 6, 387–400.

    PubMed  CAS  Google Scholar 

  104. Lee, M.-H., Nikolic, M., Baptista, CA., Lai, E., Tsai, L.-H., and Massague, J. (1996) Proc. Natl. Acad. Sci. USA 93, 3259–3263.

    PubMed  CAS  Google Scholar 

  105. Lew, J. and Wang, J.H. (1995) TIBS 20, 33–37.

    PubMed  CAS  Google Scholar 

  106. Bates, S., Bonetta, L., MacAllan, D., Parry, D., Holder, A., Dickson, C., and Peters, G. (1994) Oncogene 9, 71–79.

    PubMed  CAS  Google Scholar 

  107. Miyajima, M., Nornes, H.O., and Neuman, T. (1995) NeuroReport 6, 1130–1132.

    PubMed  CAS  Google Scholar 

  108. Azzi, L., Meijer, L., Ostvold, A.-C., Lew, J., and Wang, J.H. (1994) J. Biol. Chem. 26 13297-13288.

    Google Scholar 

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Tang, D., Wang, J.H. (1996). Cyclin-dependent kinase 5 (Cdk5) and neuron-specific Cdk5 activators. In: Meijer, L., Guidet, S., Vogel, L. (eds) Progress in Cell Cycle Research. Progress in Cell Cycle Research. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5873-6_20

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