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| | <SX load='5g5p' size='340' side='right' viewer='molstar' caption='[[5g5p]], [[Resolution|resolution]] 5.30Å' scene=''> | | <SX load='5g5p' size='340' side='right' viewer='molstar' caption='[[5g5p]], [[Resolution|resolution]] 5.30Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[5g5p]] is a 6 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_18824 Atcc 18824]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5G5P OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=5G5P FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[5g5p]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5G5P OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5G5P FirstGlance]. <br> |
| - | </td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=UNK:UNKNOWN'>UNK</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Electron Microscopy, [[Resolution|Resolution]] 5.3Å</td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=5g5p FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5g5p OCA], [http://pdbe.org/5g5p PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5g5p RCSB], [http://www.ebi.ac.uk/pdbsum/5g5p PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5g5p ProSAT]</span></td></tr> | + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=5g5p FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5g5p OCA], [https://pdbe.org/5g5p PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5g5p RCSB], [https://www.ebi.ac.uk/pdbsum/5g5p PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5g5p ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/SAC3_YEAST SAC3_YEAST]] Component of the SAC3-THP1 complex, which functions in transcription-coupled mRNA export from the nucleus to the cytoplasm. SAC3-THP1 functions in docking export-competent ribonucleoprotein particles (mRNPs) to the nuclear entrance of the nuclear pore complex (nuclear basket), by association with components of the nuclear mRNA export machinery (MEX67-MTR2 and SUB2) in the nucleoplasm and the nucleoporin NUP1 at the nuclear basket.<ref>PMID:12411502</ref> <ref>PMID:12702719</ref> [[http://www.uniprot.org/uniprot/SEM1_YEAST SEM1_YEAST]] Versatile protein that might stabilize multiple protein complexes involved in diverse pathways. Subunit of the 26S proteasome which plays a role in ubiquitin-dependent proteolysis. Associates also with the TREX-2 complex that is required for transcription-coupled mRNA export, and the COP9 signalosome, which is involved in deneddylation.<ref>PMID:19289793</ref> <ref>PMID:15117943</ref> [[http://www.uniprot.org/uniprot/THP1_YEAST THP1_YEAST]] Component of the SAC3-THP1 complex, which functions in transcription-coupled mRNA export from the nucleus to the cytoplasm. SAC3-THP1 functions in docking export-competent ribonucleoprotein particles (mRNPs) to the nuclear entrance of the nuclear pore complex (nuclear basket), by association with components of the nuclear mRNA export machinery (MEX67-MTR2 and SUB2) in the nucleoplasm and the nucleoporin NUP1 at the nuclear basket. THP1 binds to RNA in vitro.<ref>PMID:11139493</ref> <ref>PMID:12411502</ref> <ref>PMID:12702719</ref> | + | [https://www.uniprot.org/uniprot/SAC3_YEAST SAC3_YEAST] Component of the SAC3-THP1 complex, which functions in transcription-coupled mRNA export from the nucleus to the cytoplasm. SAC3-THP1 functions in docking export-competent ribonucleoprotein particles (mRNPs) to the nuclear entrance of the nuclear pore complex (nuclear basket), by association with components of the nuclear mRNA export machinery (MEX67-MTR2 and SUB2) in the nucleoplasm and the nucleoporin NUP1 at the nuclear basket.<ref>PMID:12411502</ref> <ref>PMID:12702719</ref> |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </SX> | | </SX> |
| - | [[Category: Atcc 18824]] | |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Aibara, S]] | + | [[Category: Saccharomyces cerevisiae]] |
| - | [[Category: Bai, X C]] | + | [[Category: Aibara S]] |
| - | [[Category: Stewart, M]] | + | [[Category: Bai XC]] |
| - | [[Category: Mrna]] | + | [[Category: Stewart M]] |
| - | [[Category: Mrna export]]
| + | |
| - | [[Category: Transport protein]]
| + | |
| Structural highlights
Function
SAC3_YEAST Component of the SAC3-THP1 complex, which functions in transcription-coupled mRNA export from the nucleus to the cytoplasm. SAC3-THP1 functions in docking export-competent ribonucleoprotein particles (mRNPs) to the nuclear entrance of the nuclear pore complex (nuclear basket), by association with components of the nuclear mRNA export machinery (MEX67-MTR2 and SUB2) in the nucleoplasm and the nucleoporin NUP1 at the nuclear basket.[1] [2]
Publication Abstract from PubMed
Transcription-export complex 2 (TREX-2 complex) facilitates the localization of actively transcribing genes to the nuclear periphery and also functions to contribute to the generation of export-competent mRNPs through interactions with the general mRNA nuclear export factor Mex67:Mtr2. The TREX-2 complex is based on a Sac3 scaffold to which Thp1, Sem1, Cdc31, and Sus1 bind. TREX-2 can be subdivided into two modules: one, in which Thp1 and Sem1 bind to the Sac3M region (residues approximately 100-551), and the other in which Cdc31 and two Sus1 chains bind to the Sac3CID region (residues approximately 710-805). Complementary structural analyses using X-ray crystallography, electron microscopy, and small-angle X-ray scattering of the Saccharomyces cerevisiae TREX-2 complex, expressed using Baculovirus-infected Sf9 cells, have indicated that the TPR-like repeats of the Sac3M region extend considerably further towards the N-terminus than previously thought, and also indicate that this region and Sac3CID:Sus1:Cdc31 region of the S. cerevisiae complex are structurally independent. Although the density visible accounted for only approximately 100kDa, a 5.3A resolution cryo-EM reconstruction was obtained of the M-region of TREX-2 that showed an additional three putative alpha-helices extending towards the Sac3 N-terminus and these helices were also seen in a 4.9A resolution structure obtained by X-ray crystallography. SUMMARY STATEMENT: We describe the expression, purification and structural characterization of the S. cerevisiae TREX-2 complex and demonstrate that the Sac3 TPR-like repeats are more extensive than previously thought and that the M- and CID-regions do not appear to have a defined spatial orientation.
The Sac3 TPR-like region in the Saccharomyces cerevisiae TREX-2 complex is more extensive but independent of the CID region.,Aibara S, Bai XC, Stewart M J Struct Biol. 2016 Jul 12. pii: S1047-8477(16)30148-4. doi:, 10.1016/j.jsb.2016.07.007. PMID:27422657[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Fischer T, Strasser K, Racz A, Rodriguez-Navarro S, Oppizzi M, Ihrig P, Lechner J, Hurt E. The mRNA export machinery requires the novel Sac3p-Thp1p complex to dock at the nucleoplasmic entrance of the nuclear pores. EMBO J. 2002 Nov 1;21(21):5843-52. PMID:12411502
- ↑ Gallardo M, Luna R, Erdjument-Bromage H, Tempst P, Aguilera A. Nab2p and the Thp1p-Sac3p complex functionally interact at the interface between transcription and mRNA metabolism. J Biol Chem. 2003 Jun 27;278(26):24225-32. Epub 2003 Apr 17. PMID:12702719 doi:http://dx.doi.org/10.1074/jbc.M302900200
- ↑ Aibara S, Bai XC, Stewart M. The Sac3 TPR-like region in the Saccharomyces cerevisiae TREX-2 complex is more extensive but independent of the CID region. J Struct Biol. 2016 Jul 12. pii: S1047-8477(16)30148-4. doi:, 10.1016/j.jsb.2016.07.007. PMID:27422657 doi:http://dx.doi.org/10.1016/j.jsb.2016.07.007
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