title: The deadenylase components Not2p, Not3p, and Not5p promote mRNA decapping.
abstract: Decay of mRNA is essential for the efficient regulation of gene expression. A major pathway of mRNA degradation is initiated by the shortening of the poly(A) tail via the CCR4/NOT deadenylase complex. Deadenylation is followed by removal of the 5' cap (i.e., decapping) and then 5' to 3' exonucleolytic decay of the message body. The highly conserved CCR4/NOT deadenylase complex consists of the exonucleases CCR4 and POP2/CAF1, as well as a group of four or five (depending on organism) accessory factors of unknown function, i.e., the NOT proteins. In this study, we find thatSaccharomyces cerevisiaeNot2p, Not3p, and Not5p (close paralogs of each other) are involved in promoting mRNA decapping. Furthermore, we find that Not3p and Not5p bind to the decapping activator protein Pat1p. Together, these data implicate the deadenylase complex in coordinating the downstream decapping reaction via Not2p, Not3p, and Not5p. This suggests that the coupling of deadenylation with decapping is, in part, a direct consequence of coordinated assembly of decay factors.
authors.affiliation: Center for RNA Molecular Biology, Case Western Reserve University, Cleveland, Ohio 44106, USA.
authors.forename: Najwa
authors.initials: N
authors.lastname: Alhusaini
authors.affiliation: Center for RNA Molecular Biology, Case Western Reserve University, Cleveland, Ohio 44106, USA.
authors.forename: Jeff
authors.identifier: http://orcid.org/0000-0001-5662-8110
authors.initials: J
authors.lastname: Coller
mesh_terms: D000595:Amino Acid Sequence; D015153:Blotting, Western; D008969:Molecular Sequence Data; D012315:RNA Caps; D012333:RNA, Messenger / Q000235:genetics*; D012441:Saccharomyces cerevisiae / Q000235:genetics; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry / Q000235:genetics / Q000502:physiology*; D017386:Sequence Homology, Amino Acid; D020798:Two-Hybrid System Techniques
chemical_list: D012315:RNA Caps; D012333:RNA, Messenger; D029701:Saccharomyces cerevisiae Proteins
keywords: deadenylation; decapping; mRNA decay; mRNA stability