Sandbox Reserved 1777: Difference between revisions

From Proteopedia
Jump to navigationJump to search
No edit summary
No edit summary
Line 40: Line 40:
==Active Site==
==Active Site==


Once all the domains are bound, [https://en.wikipedia.org/wiki/Nucleoside_triphosphate NTpS] binds to PP1C in the active site. '''sentence explaining NTPS'''. Once NTpS is bound, PP1C catalyzes the dephosphorylation of serine 259. NTpS is dephosphorylated to prevent the active dimeric RAF from inactivating and changing into its monomeric structure. The <scene name='95/952705/Pp1c_active_site/4'>NTpS active site</scene> is surrounded by hydrophobic and acidic regions along with the C-terminus. These regions are located on the surface of PP1C, whereas the active site is placed further into the structure. It is thought that these regions help the ligand bind to the active site by making interactions that will lead NTpS into the protein. There is still some uncertainty as to how the substrate selectivity works, but these regions could play an essential role in it. Specifically, the pS from NTpS would bind to the hydrophobic region on PP1C<ref name="Liau">PMID:35768504</ref>.
Once all the domains are bound, [https://en.wikipedia.org/wiki/Nucleoside_triphosphate NTpS] binds to PP1C in the active site. NTpS refers to the phosphorylated serine (residue 259) located at the N-terminus of RAF. Once NTpS is bound, PP1C catalyzes the dephosphorylation of serine 259. NTpS is dephosphorylated to prevent the active dimeric RAF from inactivating and changing into its monomeric structure. The <scene name='95/952705/Pp1c_active_site/4'>NTpS active site</scene> is surrounded by hydrophobic and acidic regions along with the C-terminus. These regions are located on the surface of PP1C, whereas the active site is placed further into the structure. It is thought that these regions help the ligand bind to the active site by making interactions that will lead NTpS into the protein. There is still some uncertainty as to how the substrate selectivity works, but these regions could play an essential role in it. Specifically, the pS from NTpS would bind to the hydrophobic region on PP1C<ref name="Liau">PMID:35768504</ref>.
   
   
NTpS can bind to the PP1C active site without PP1C also being bound to SHOC2 and MRAS, however, the catalytic activity is much slower and the reaction is less efficient. In order for NTpS to bind PP1C in the absence of the other two proteins, NTpS would need to be exposed from its binding site in the inactive RAF complex. RAS has to bind to RAF to expose the NTpS allowing PP1C and NTpS to bind.
NTpS can bind to the PP1C active site without PP1C also being bound to SHOC2 and MRAS, however, the catalytic activity is much slower and the reaction is less efficient. In order for NTpS to bind PP1C in the absence of the other two proteins, NTpS would need to be exposed from its binding site in the inactive RAF complex. RAS has to bind to RAF to expose the NTpS allowing PP1C and NTpS to bind.