Protein
PAN2-PAN3 deadenylation complex subunit pan3
Organism
Neurospora crassa (strain ATCC 24698 / 74-OR23-1A / CBS 708.71 / DSM 1257 / FGSC 987)
Function
Regulatory subunit of the poly(A)-nuclease (PAN) deadenylation complex, one of two cytoplasmic mRNA deadenylases involved in mRNA turnover. PAN specifically shortens poly(A) tails of RNA and the activity is stimulated by poly(A)-binding protein pabp-1. PAN deadenylation is followed by rapid degradation of the shortened mRNA tails by the CCR4-NOT complex. Deadenylated mRNAs are then degraded by two alternative mechanisms, namely exosome-mediated 3'-5' exonucleolytic degradation, or deadenlyation-dependent mRNA decaping and subsequent 5'-3' exonucleolytic degradation by rgb-30/xrn1. May also be involved in post-transcriptional maturation of mRNA poly(A) tails. par-2/pan3 acts as a positive regulator for PAN activity, recruiting the catalytic subunit par-1/pan2 to mRNA via its interaction with RNA and with pabp-1.
Similarity
Belongs to the protein kinase superfamily. PAN3 family.
Sequence
MAATRYNSGDLRRQVGSPRAKNRDTKETLCRNVVIYGHCRWEDSGCTFNHDQNKASVSQTDLNSNRRVFNVESPSFTPANQQQSAGKKSTFSSQAASAAPFTPRGVGTSTPTLQQANDSTIFNPAAIREFTPQNYDVGNTISQNGAQHVTQDGGLYSDPFSISSLGQTMPPQGQYNPYANDPNNLAGAGAGLYQPAGFGNGLVHPPNYHLYQPPSELYRPSLQPYQRTTYDFFIPKDRRENLQKKLFHMQQLLPNSGLPNLDRWHSLFPLDTKATRNSTCFGYPSWMYKAQNNKNGRHFALRRIEGYRLTNEKAILNVTKEWKKIINANIVTVHEAFTTEFFGDSSLIFVYDFHPLSETLYDHHFPPNNSHNRLRNTNKIPENLLWSYVCQIANALLAIHNAKLAARCLELSKIIWENNRIRLAACSILDVLHHDSPNRKTIEELQQEDFVKFGRIILALATNTPTLNFNNIDAALATIVPRYSTQLRGVLEWLIKPSAPGETKTVETLLGGITTHLANFANFVMQESDEKEFHLMRELENGRIARLMFKLSVVNERGDSCGVHNWSETGERLLLKLFRDYVFHQVDADGKARLDTNHYLNCLSKLDASSEEQILLTSRDNATVFVVSYRSIRQMLDRAYGELGKESKPSATGATI