Protein
Decapping and exoribonuclease protein 1
Organism
Kluyveromyces lactis (strain ATCC 8585 / CBS 2359 / DSM 70799 / NBRC 1267 / NRRL Y-1140 / WM37)
Function
Ribonuclease that specifically degrades pre-mRNAs with a defective 5' end cap and is part of a pre-mRNA capping quality control. Has decapping and 5'-3' exonuclease activities. Has decapping activity toward incomplete 5' end cap mRNAs such as unmethylated 5' end-capped RNA to release GpppN and 5' end monophosphate RNA. The 5' end monophosphate RNA is then degraded by the 5'-3' exoribonuclease activity, enabling this enzyme to decap and degrade incompletely capped mRNAs.
Similarity
Belongs to the DXO/Dom3Z family.
Sequence
MTTVSCDKDENKVDQLGESLSQLRISTRKNNKPSQKKGSLVLSCKKFPHVSVNYVVDKTPKLLTDCKEVHNCSYIINDATLLWNEASRKPRLRPEVCTYIKDSKWENKAVKDSFIGIDLTKGYDDYVPLDRNVLNSLVILKEAYQRYEKTLNPEKTTFVSLRHHIIDIIMCPFLDEPLSLLMTVQPDKNILISVDKSKDKPNGIHETRNSFNKKICYTGFALEDLLIESPTEGHILEHELYYSIVHGSLNDEIDLLIQAEMDSINTLTDTYTEIKSSVHFKLGNTYHRRKLLRMWIQTNLLPKSDLLIGFRNSYSNELEQLKAYKIQDIYHKINNSSIVGKPGKFYKFNPNVANDWFQHIFQVLKQNLLLLSQESTSTTFKVQIDTNLTLSISPASQFVTALG