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Protein: AKT3_HUMAN

RAC-gamma serine/threonine-protein kinase

FUNCTION: IGF-1 leads to the activation of AKT3, which may play a role in regulating cell survival. Capable of phosphorylating several known proteins. Truncated isoform 2/PKB gamma 1 without the second serine phosphorylation site could still be stimulated but to a lesser extent. CATALYTIC ACTIVITY: ATP + a protein = ADP + a phosphoprotein. more...

ENZYME REGULATION: Two specific sites, one in the kinase domain (Thr-305) and the other in the C-terminal regulatory region (Ser- 472), need to be phosphorylated for its full activation (By similarity).

SUBUNIT: Interacts (via PH domain) with TCL1A; this enhances AKT3 phosphorylation and activation. Interacts with TRAF6.

SUBCELLULAR LOCATION: Cytoplasm. Membrane; Peripheral membrane protein. Note=Membrane-associated after cell stimulation leading to its translocation.

ALTERNATIVE PRODUCTS: Event=Alternative splicing; Named isoforms=2; Name=1; Synonyms=PKB gamma; IsoId=Q9Y243-1; Sequence=Displayed; Name=2; Synonyms=PKB gamma 1; IsoId=Q9Y243-2; Sequence=VSP_004947;

TISSUE SPECIFICITY: In adult tissues, it is highly expressed in brain, lung and kidney, but weakly in heart, testis and liver. In fetal tissues, it is highly expressed in heart, liver and brain and not at all in kidney.

DOMAIN: Binding of the PH domain to the phosphatidylinositol 3- kinase alpha (PI(3)K) results in its targeting to the plasma membrane.

PTM: Phosphorylation on Thr-305 and Ser-472 is required for full activity (By similarity). Phosphorylated upon DNA damage, probably by ATM or ATR.

PTM: Ubiquitinated. When fully phosphorylated and translocated into the nucleus, undergoes 'Lys-48'-polyubiquitination catalyzed by TTC3, leading to its degradation by the proteasome.

SIMILARITY: Belongs to the protein kinase superfamily. AGC Ser/Thr protein kinase family. RAC subfamily.

SIMILARITY: Contains 1 AGC-kinase C-terminal domain.

SIMILARITY: Contains 1 PH domain.

SIMILARITY: Contains 1 protein kinase domain. WEB RESOURCE: Name=Atlas of Genetics and Cytogenetics in Oncology and Haematology; URL="";


COPYRIGHT: Protein annotation is derived from the UniProt Consortium ( Distributed under the Creative Commons Attribution-NoDerivs License.



  • Homo sapiens

Gene Symbol:

  • AKT3


  • Protein kinase B gamma
  • Protein kinase Akt-3
  • RAC-PK-gamma
  • STK-2
  • PKB gamma

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