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4b8b

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N-Terminal domain of the yeast Not1

Structural highlights

4b8b is a 2 chain structure with sequence from Saccharomyces cerevisiae S288C. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.801Å
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

NOT1_YEAST Acts as component of the CCR4-NOT core complex, which in the nucleus seems to be a general transcription factor, and in the cytoplasm the major mRNA deadenylase involved in mRNA turnover. The NOT protein subcomplex negatively regulates the basal and activated transcription of many genes. Preferentially affects TC-type TATA element-dependent transcription. Could directly or indirectly inhibit component(s) of the general transcription machinery.^[1]

Publication Abstract from PubMed

Shortening eukaryotic poly(A) tails represses mRNA translation and induces mRNA turnover. The major cytoplasmic deadenylase, the Ccr4-Not complex, is a conserved multisubunit assembly. Ccr4-Not is organized around Not1, a large scaffold protein that recruits two 3'-5' exoribonucleases, Caf1 and Ccr4. We report structural studies showing that the N-terminal arm of yeast Not1 has a HEAT-repeat structure with domains related to the MIF4G fold. A MIF4G domain positioned centrally within the Not1 protein recognizes Caf1, which in turn binds the LRR domain of Ccr4 and tethers the Ccr4 nuclease domain. The interactions that form the nuclease core of the Ccr4-Not complex are evolutionarily conserved. Their specific disruption affects cell growth and mRNA deadenylation and decay in vivo in yeast. Thus, the N-terminal arm of Not1 forms an extended platform reminiscent of scaffolding proteins like eIF4G and CBP80, and places the two nucleases in a pivotal position within the Ccr4-Not complex.

Architecture of the nuclease module of the yeast ccr4-not complex: the not1-caf1-ccr4 interaction.,Basquin J, Roudko VV, Rode M, Basquin C, Seraphin B, Conti E Mol Cell. 2012 Oct 26;48(2):207-18. doi: 10.1016/j.molcel.2012.08.014. Epub 2012 , Sep 6. PMID:22959269^[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Liu HY, Badarinarayana V, Audino DC, Rappsilber J, Mann M, Denis CL. The NOT proteins are part of the CCR4 transcriptional complex and affect gene expression both positively and negatively. EMBO J. 1998 Feb 16;17(4):1096-106. PMID:9463387 doi:http://dx.doi.org/10.1093/emboj/17.4.1096
↑ Basquin J, Roudko VV, Rode M, Basquin C, Seraphin B, Conti E. Architecture of the nuclease module of the yeast ccr4-not complex: the not1-caf1-ccr4 interaction. Mol Cell. 2012 Oct 26;48(2):207-18. doi: 10.1016/j.molcel.2012.08.014. Epub 2012 , Sep 6. PMID:22959269 doi:http://dx.doi.org/10.1016/j.molcel.2012.08.014