rac-alpha serine/threonine kinase (AKT1 kinase, protein kinase B)

From Aaushi
Jump to navigation Jump to search

Function

  • inactive homodimer binds to & dissociates upon binding with phosphatidylinositol 3-phosphates.
  • Akt1 kinase activity is stimulated by insulin & IGF-1
  • activated by phosphorylation on T308 (by PDK1) & S473
Substrates include:         site
AHNAK                       Ser1169
ARK5                        Ser600
ASK1 (MAP3K5)               Ser83
AS160                       Ser588, Thr642
ATP citrate lyase           Ser455
BAD                         Ser75, Ser99
Caspase 9 alpha             Ser196
Ezrin                       Thr567
Cytovillin                  Thr567
Villin 2                    Thr567
Filamin C                   Ser2213
Forkhead                    Thr24, Ser256, Ser319
GABA A receptor             Ser410
GSK3 alpha                  Ser19
GSK3 beta                   Ser9
HAND2, dHAND                Ser114 ?
Huntingtin                  Ser421
I kappa-B kinase alpha      Thr23
IRS-1                       Ser270, Ser307, Ser330, Ser527
PAK1                        Ser21
p21WAF1                     Thr145, Ser 146
PTP-1B                      Ser50
PFK-2                       Ser466, Ser483
PRAS40                      Thr246
p47phox                     Ser304, Ser328
14-3-3-zeta                 Ser58
Raf-1 (c-Raf)               Ser259
MKK4 (SEK1)                 Ser78
Tau                         Thr212, Ser214
Tuberin                     Ser939
WNK1                        Thr60
yes associated protein YAP
  • phosphorylation of glycogen synthase kinase 3 leads to inactivation
  • phosphorylation of foxO subfamily of forkhead transcription factors leads to exclusion from the nucleus
  • Akt1 plays role in insulin signaling, cell survival & transformation
  • Akt1 inhibits apoptosis by preventing exposure of membrane phosphatidylserine[5]

Pathology

Laboratory

More general terms

References

  1. Bellacosa A, Testa JR, Staal SP, Tsichlis PN. A retroviral oncogene, akt, encoding a serine-threonine kinase containing an SH2-like region. Science. 1991 Oct 11;254(5029):274-7. PMID: https://www.ncbi.nlm.nih.gov/pubmed/1833819
  2. Bos TIBS 20:442 1995
  3. Maira SM, Galetic I, Brazil DP, Kaech S, Ingley E, Thelen M, Hemmings BA. Carboxyl-terminal modulator protein (CTMP), a negative regulator of PKB/Akt and v-Akt at the plasma membrane. Science. 2001 Oct 12;294(5541):374-80. PMID: https://www.ncbi.nlm.nih.gov/pubmed/11598301
  4. Kinasource http://www.kinasource.co.uk/Database/A%20substrates/Akt%20substrates.html
  5. 5.0 5.1 Kang JQ, Chong ZZ, Maiese K. Critical role for Akt1 in the modulation of apoptotic phosphatidylserine exposure and microglial activation. Mol Pharmacol. 2003 Sep;64(3):557-69. PMID: https://www.ncbi.nlm.nih.gov/pubmed/12920191

Database