PMID- 23002146 OWN - NLM STAT- MEDLINE DCOM- 20130130 LR - 20211021 IS - 1362-4962 (Electronic) IS - 0305-1048 (Print) IS - 0305-1048 (Linking) VI - 40 IP - 21 DP - 2012 Nov TI - Rbg1-Tma46 dimer structure reveals new functional domains and their role in polysome recruitment. PG - 11100-14 LID - 10.1093/nar/gks867 [doi] AB - Developmentally Regulated GTP-binding (DRG) proteins are highly conserved GTPases that associate with DRG Family Regulatory Proteins (DFRP). The resulting complexes have recently been shown to participate in eukaryotic translation. The structure of the Rbg1 GTPase, a yeast DRG protein, in complex with the C-terminal region of its DFRP partner, Tma46, was solved by X-ray diffraction. These data reveal that DRG proteins are multimodular factors with three additional domains, helix-turn-helix (HTH), S5D2L and TGS, packing against the GTPase platform. Surprisingly, the S5D2L domain is inserted in the middle of the GTPase sequence. In contrast, the region of Tma46 interacting with Rbg1 adopts an extended conformation typical of intrinsically unstructured proteins and contacts the GTPase and TGS domains. Functional analyses demonstrate that the various domains of Rbg1, as well as Tma46, modulate the GTPase activity of Rbg1 and contribute to the function of these proteins in vivo. Dissecting the role of the different domains revealed that the Rbg1 TGS domain is essential for the recruitment of this factor in polysomes, supporting further the implication of these conserved factors in translation. FAU - Francis, Sandrea M AU - Francis SM AD - Instituto de Biomedicina de Valencia (IBV-CSIC), Calle Jaime Roig, 11, Valencia E-46010, Spain. FAU - Gas, Maria-Eugenia AU - Gas ME FAU - Daugeron, Marie-Claire AU - Daugeron MC FAU - Bravo, Jeronimo AU - Bravo J FAU - Seraphin, Bertrand AU - Seraphin B LA - eng SI - PDB/4A9A PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20120923 PL - England TA - Nucleic Acids Res JT - Nucleic acids research JID - 0411011 RN - 0 (Fungal Proteins) RN - 149371-72-2 (developmentally regulated GTP-binding protein) RN - 86-01-1 (Guanosine Triphosphate) RN - EC 3.6.1.- (GTP-Binding Proteins) SB - IM MH - Amino Acid Sequence MH - Dimerization MH - Fungal Proteins/*chemistry/genetics/metabolism MH - GTP-Binding Proteins/*chemistry/metabolism MH - Gene Deletion MH - Guanosine Triphosphate/metabolism MH - Models, Molecular MH - Molecular Sequence Data MH - Polyribosomes/*metabolism MH - Protein Structure, Tertiary MH - Static Electricity PMC - PMC3510508 EDAT- 2012/09/25 06:00 MHDA- 2013/01/31 06:00 PMCR- 2012/09/23 CRDT- 2012/09/25 06:00 PHST- 2012/09/25 06:00 [entrez] PHST- 2012/09/25 06:00 [pubmed] PHST- 2013/01/31 06:00 [medline] PHST- 2012/09/23 00:00 [pmc-release] AID - gks867 [pii] AID - 10.1093/nar/gks867 [doi] PST - ppublish SO - Nucleic Acids Res. 2012 Nov;40(21):11100-14. doi: 10.1093/nar/gks867. Epub 2012 Sep 23.