5aie

From Proteopedia

(Difference between revisions)

Current revision

Not4 ring domain in complex with Ubc4

Structural highlights

5aie 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 2.8Å
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

NOT4_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

The Ccr4-Not complex regulates eukaryotic gene expression at multiple levels, including mRNA turnover, translational repression, and transcription. We have studied the ubiquitylation module of the yeast Ccr4-Not complex and addressed how E3 ligase binds cognate E2 and how it is tethered to the complex. The 2.8-A resolution crystal structure of the N-terminal RING domain of Not4 in complex with Ubc4 shows the detailed interactions of this E3-E2 complex. The 3.6-A resolution crystal structure of the C-terminal domain of the yeast Not4 in complex with the C-terminal domain of Not1 reveals how a largely extended region at the C-terminus of Not4 wraps around a HEAT-repeat region of Not1. This C-terminal region of Not4 is only partly conserved in metazoans, rationalizing its weaker Not1-binding properties. The structural and biochemical data show how Not1 can incorporate both the ubiquitylation module and the Not2-Not3/5 module concomitantly in the Ccr4-Not complex.

Architecture of the ubiquitylation module of the yeast ccr4-not complex.,Bhaskar V, Basquin J, Conti E Structure. 2015 May 5;23(5):921-8. doi: 10.1016/j.str.2015.03.011. Epub 2015 Apr , 23. PMID:25914052^[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
↑ Bhaskar V, Basquin J, Conti E. Architecture of the ubiquitylation module of the yeast ccr4-not complex. Structure. 2015 May 5;23(5):921-8. doi: 10.1016/j.str.2015.03.011. Epub 2015 Apr , 23. PMID:25914052 doi:http://dx.doi.org/10.1016/j.str.2015.03.011