5anr
From Proteopedia
Structure of a human 4E-T - DDX6 - CNOT1 complex
Structural highlights
Disease[4ET_HUMAN] Primary ovarian failure. [DDX6_HUMAN] Note=A chromosomal aberration involving DDX6 may be a cause of hematopoietic tumors such as B-cell lymphomas. Translocation t(11;14)(q23;q32). Function[CNOT1_HUMAN] Belongs to the CCR4-NOT complex that functions as general transcription regulation complex. Acts as a transcriptional repressor. Represses the ligand-dependent transcriptional activation by nuclear receptors.[1] [2] [4ET_HUMAN] Nucleoplasmic shuttling protein. Mediates the nuclear import of EIF4E by a piggy-back mechanism. [DDX6_HUMAN] In the process of mRNA degradation, may play a role in mRNA decapping. Publication Abstract from PubMedThe DEAD-box protein DDX6 is a central component of translational repression mechanisms in maternal mRNA storage in oocytes and microRNA-mediated silencing in somatic cells. DDX6 interacts with the CCR4-NOT complex and functions in concert with several post-transcriptional regulators, including Edc3, Pat1, and 4E-T. We show that the conserved CUP-homology domain (CHD) of human 4E-T interacts directly with DDX6 in both the presence and absence of the central MIF4G domain of CNOT1. The 2.1-A resolution structure of the corresponding ternary complex reveals how 4E-T CHD wraps around the RecA2 domain of DDX6 and contacts CNOT1. Although 4E-T CHD lacks recognizable sequence similarity with Edc3 or Pat1, it shares the same DDX6-binding surface. In contrast to 4E-T, however, the Edc3 and Pat1 FDF motifs dissociate from DDX6 upon CNOT1 MIF4G binding in vitro. The results underscore the presence of a complex network of simultaneous and/or mutually exclusive interactions in DDX6-mediated repression. Structure of a Human 4E-T/DDX6/CNOT1 Complex Reveals the Different Interplay of DDX6-Binding Proteins with the CCR4-NOT Complex.,Ozgur S, Basquin J, Kamenska A, Filipowicz W, Standart N, Conti E Cell Rep. 2015 Oct 27;13(4):703-11. doi: 10.1016/j.celrep.2015.09.033. Epub 2015 , Oct 17. PMID:26489469[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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