Fas-L on the cytotoxic T cell binds to its receptor, the Fas protein on the tumor cells, an apoptotic signaling pathway in the tumor cells becomes activated, which also leads to tumor cell death. 

TLS Online TPP Program

#Id: 9669

#XL - T Zoology

PI-3 kinase was first identified in studies of the 

polyoma virus, a DNA virus

TLS Online TPP Program

#Id: 9670

#XL - T Zoology

PKB contains:

A PH domain

A kinase domain

TLS Online TPP Program

#Id: 9671

#XL - T Zoology

PH domain of PKB binds with high affinity to the 

3-phosphates in both PI(3,4)P2 and PI(3,4,5)P3

TLS Online TPP Program

#Id: 9672

#XL - T Zoology

In unstimulated cells, 

concentration of phosphoinositides is low, and PKB is

inactive because its PH domain physically blocks the kinase active site

TLS Online TPP Program

#Id: 9673

#XL - T Zoology

Ligand-induced receptor activation,

Concentration of PI 3-phosphates rises

PH domain of PKB binds to PI 3-phosphates

TLS Online TPP Program

#Id: 9674

#XL - T Zoology

Maximal activation of PKB depends on recruitment to the cytosolic surface of the plasma membrane of two other kinases -PDK1 and PDK2.