7APK image
Deposition Date 2020-10-17
Release Date 2020-12-16
Last Version Date 2024-05-01
Entry Detail
PDB ID:
7APK
Keywords:
GENE REGULATION
Title:
Structure of the human THO - UAP56 complex
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Trichoplusia ni
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
3.30 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
7APK validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:THO complex subunit 1
Gene (Uniprot):THOC1
Chain IDs:A, H (auth: I), P (auth: a), W (auth: i)
Chain Length:711
Number of Molecules:4
Biological Source:Homo sapiens
UniProt ID:Q96FV9 Pfam ID:PF11957, PF00531
Protein Blast
Polymer Type:polypeptide(L)
Molecule:THO complex subunit 2
Gene (Uniprot):THOC2
Chain IDs:B, I (auth: J), Q (auth: b), X (auth: j)
Chain Length:1226
Number of Molecules:4
Biological Source:Homo sapiens
UniProt ID:Q8NI27 Pfam ID:PF16134, PF11732, PF11262
Protein Blast
Polymer Type:polypeptide(L)
Molecule:THO complex subunit 3
Gene (Uniprot):THOC3
Chain IDs:C, J (auth: K), R (auth: c), Y (auth: k)
Chain Length:395
Number of Molecules:4
Biological Source:Homo sapiens
UniProt ID:Q96J01 Pfam ID:PF00400, PF07676, PF12894
Protein Blast
Polymer Type:polypeptide(L)
Molecule:THO complex subunit 5 homolog
Gene (Uniprot):THOC5
Chain IDs:D (auth: E), K (auth: M), S (auth: e), Z (auth: m)
Chain Length:683
Number of Molecules:4
Biological Source:Homo sapiens
UniProt ID:Q13769 Pfam ID:PF09766
Protein Blast
Polymer Type:polypeptide(L)
Molecule:THO complex subunit 6 homolog
Gene (Uniprot):THOC6
Chain IDs:E (auth: F), L (auth: N), T (auth: f), AA (auth: n)
Chain Length:341
Number of Molecules:4
Biological Source:Homo sapiens
UniProt ID:Q86W42 Pfam ID:PF00400
Protein Blast
Polymer Type:polypeptide(L)
Molecule:THO complex subunit 7 homolog
Gene (Uniprot):THOC7
Chain IDs:F (auth: G), M (auth: O), U (auth: g), BA (auth: o)
Chain Length:204
Number of Molecules:4
Biological Source:Homo sapiens
UniProt ID:Q6I9Y2 Pfam ID:PF05615
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Spliceosome RNA helicase DDX39B
Gene (Uniprot):DDX39B
Chain IDs:G (auth: H), N (auth: P), V (auth: h), CA (auth: p)
Chain Length:451
Number of Molecules:4
Biological Source:Homo sapiens
UniProt ID:Q13838 Pfam ID:PF00270, PF00271
Polymer Type:polypeptide(L)
Molecule:THOC2 anchor (putative)
Chain IDs:O (auth: X), DA (auth: x)
Chain Length:37
Number of Molecules:2
Biological Source:Homo sapiens
Ligand Molecules
NA
Primary Citation
Structure of the human core transcription-export complex reveals a hub for multivalent interactions.
Elife 9 ? ? (2020)
PMID: 33191911 DOI: 10.7554/eLife.61503

Abstact

The export of mRNA from nucleus to cytoplasm requires the conserved and essential transcription and export (TREX) complex (THO-UAP56/DDX39B-ALYREF). TREX selectively binds mRNA maturation marks and licenses mRNA for nuclear export by loading the export factor NXF1-NXT1. How TREX integrates these marks and achieves high selectivity for mature mRNA is poorly understood. Here, we report the cryo-electron microscopy structure of the human THO-UAP56/DDX39B complex at 3.3 Å resolution. The seven-subunit THO-UAP56/DDX39B complex multimerizes into a 28-subunit tetrameric assembly, suggesting that selective recognition of mature mRNA is facilitated by the simultaneous sensing of multiple, spatially distant mRNA regions and maturation marks. Two UAP56/DDX39B RNA helicases are juxtaposed at each end of the tetramer, which would allow one bivalent ALYREF protein to bridge adjacent helicases and regulate the TREX-mRNA interaction. Our structural and biochemical results suggest a conserved model for TREX complex function that depends on multivalent interactions between proteins and mRNA.

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Primary Citation of related structures
7APK