Water achieves its highest density—that is, its molecules are the most packed together—at 4°C.

TLS Online TPP Program

#Id: 10483

#Unit 4. Cell Communication and Cell Signaling

MDM2

catalyzes the ubiquitinylation of p53 & targeting it for proteasomal degradation

TLS Online TPP Program

#Id: 10484

#Unit 4. Cell Communication and Cell Signaling

Rapid degradation of p53 is inhibited by ATM and ATR, after DNA damage

TLS Online TPP Program

#Id: 10485

#Unit 4. Cell Communication and Cell Signaling

Phosphorylation of p53 on a serine residue in the N-terminus by ATM or DNA-PK displaces bound MDM2 from p53, thereby stabilizing it

TLS Online TPP Program

#Id: 10486

#Unit 4. Cell Communication and Cell Signaling

MDM2 levels in the cytoplasm are controlled by

ATR and p14ARF (p19ARF in the mouse), sequesters it in the nucleolus, where it cannot access p53.

TLS Online TPP Program

#Id: 10487

#Unit 4. Cell Communication and Cell Signaling

Neoantigens are self-antigens generated by tumor cells because of genomic mutations, also derive from unique proteins or peptides produced by dysregulated RNA splicing and disordered post-translational protein modification

TLS Online TPP Program

#Id: 10488

#Unit 4. Cell Communication and Cell Signaling

Most tumor cells,express MHC class I molecules on their surface, cytotoxic T cells can directly recognize tumor cells expressing neo-antigens.