description
After undergoing rounds of translation, mRNA is normally destroyed by the deadenylation-dependent pathway. Though the trigger is unclear, deadenylation likely proceeds in two steps: one catalyzed by the PAN2-PAN3 complex that shortens the poly(A) tail from about 200 adenosine residues to about 80 residues and one catalyzed by the CCR4-NOT complex or by the PARN enzyme that shortens the tail to about 10-15 residues.After deadenylation the mRNA is then hydrolyzed by either the 5' to 3' pathway or the 3' to 5' pathway. It is unknown what determinants target a mRNA to one pathway or the other.The 5' to 3' pathway is initiated by binding of the Lsm1-7 complex to the 3' oligoadenylate tail followed by decapping by the DCP1-DCP2 complex. The 5' to 3' exoribonuclease XRN1 then hydrolyzes the remaining RNA.The 3' to 5' pathway is initiated by the exosome complex at the 3' end of the mRNA. The exosome processively hydrolyzes the mRNA from 3' to 5', leaving only a capped oligoribonucleotide. The cap is then removed by the scavenging decapping enzyme DCPS

external resources
NCBI:1269712
REACTOME:R-HSA-429914
PUBMED:19239894
PUBMED:14749774
PUBMED:17245413
PUBMED:15475613
PUBMED:16141059
PUBMED:11283721

genes
DDX6 , EIF4A1 , EIF4A2 , EIF4B , EIF4E , EIF4G1 , CNOT2 , CNOT3 , CNOT4 , PARN , EXOSC9 , SKIV2L , CNOT9 , CNOT8 , TTC37 , EIF4A3 , PAN2 , PAIP1 , HBS1L , LSM6 , EXOSC8 , DIS3 , EXOSC7 , CNOT1 , EXOSC2 , EDC4 , LSM5 , LSM4 , CNOT10 , PABPC1 , LSM1 , LSM3 , DCPS , CNOT7 , EXOSC3 , EXOSC1 , LSM7 , XRN1 , EXOSC4 , CNOT11 , DCP1A , EXOSC5 , CNOT6 , LSM2 , EDC3 , WDR61 , TNKS1BP1 , NT5C3B , EXOSC6 , DCP2 , DCP1B , PATL1 , CNOT6L , PAN3 ,