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Ca2+/kalmodulin-zavisne proteinske kinaze

Kalcijum/kalmodulin zavisna proteinska kinaza II
Kristalna struktura kalcijum/kalmodulin zavisne proteinske kinaze
Identifikatori
SimbolCaMKII_AD
PfamPF08332
Pfam klanCL0051
InterProIPR013543
Zadržavanje CaMKII gama holoenzima (A) u zatvorenoj i (B) otvorenoj konformaciji (modeli prikazuju 2ux0​ i 2v7o​)

Ca2+/kalmodulin-zavisne proteinske kinaze, ili CaM kinaze (ЕЦ 2.7.11.17), su serin/treonin-specifične proteinske kinaze koje su prvenstveno regulisane Ca2+/kalmodulin kompleksom.[1]

Postoje dva tipa CaM kinaza:

  • Specijalizovane CaM kinaze. Primer kinaze ovog tipa je miozinski-laki-lanac kinaza (MLCK) koja fosforiliše miozin, uzrokujući kontrakciju glatkih mišića.
  • Multifunkcionalne CaM kinaze. Takođe su poznate kao CaM kinaze II. One učestvuju u mnogim procesima, kao što je sekrecija neurotransmitera, regulacija transkripcionih faktora, i metabolizam glikogena. Između 1% i 2% proteina mozga su CaM kinaze II.

Usled njihove sposobnosti da se autofosforilišu, CaMK aktivnost može da bude dugotrajnija od intracelularnog kalcijuma koji je neophodan za njihovu aktivaciju. U neuronima, ova osobina je važna za indukciju sinaptičke plastičnosti.[2] Farmakološka inhibicija CaMKII blokira indukciju dugotrajne potencijacije. Nakon aktivacije, CaMKII fosforiliše postsinaptičke glutamatne receptore i time menja električne osobine sinapse.

  • CaMK I - CAMK1, CAMK1D, CAMK1G
  • CaMK II - CAMK2A, CAMK2B, CAMK2D, CAMK2G
  • CaMK IV - CAMK4
  1. ^ Soderling TR (1999). „The Ca-calmodulin-dependent protein kinase cascade”. Trends in Biochemical Sciences. 24 (6): 232—6. PMID 10366852. 
  2. ^ Lisman, J. E. (1985) A mechanism for memory storage insensitive to molecular turnover: a bistable autophosphorylating kinase. Proc Natl Acad Sci USA 82(9): 3055-7

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Ca2+/kalmodulin-zavisne proteinske kinaze
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