4PYU

The conserved ubiquitin-like protein hub1 plays a critical role in splicing in human cells


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The conserved ubiquitin-like protein Hub1 plays a critical role in splicing in human cells.

Ammon, T.Mishra, S.K.Kowalska, K.Popowicz, G.M.Holak, T.A.Jentsch, S.

(2014) J Mol Cell Biol 6: 312-323

  • DOI: 10.1093/jmcb/mju026

  • PubMed Abstract: 
  • Different from canonical ubiquitin-like proteins, Hub1 does not form covalent conjugates with substrates but binds proteins non-covalently. In Saccharomyces cerevisiae, Hub1 associates with spliceosomes and mediates alternative splicing of SRC1, with ...

    Different from canonical ubiquitin-like proteins, Hub1 does not form covalent conjugates with substrates but binds proteins non-covalently. In Saccharomyces cerevisiae, Hub1 associates with spliceosomes and mediates alternative splicing of SRC1, without affecting pre-mRNA splicing generally. Human Hub1 is highly similar to its yeast homolog, but its cellular function remains largely unexplored. Here, we show that human Hub1 binds to the spliceosomal protein Snu66 as in yeast; however, unlike its S. cerevisiae homolog, human Hub1 is essential for viability. Prolonged in vivo depletion of human Hub1 leads to various cellular defects, including splicing speckle abnormalities, partial nuclear retention of mRNAs, mitotic catastrophe, and consequently cell death by apoptosis. Early consequences of Hub1 depletion are severe splicing defects, however, only for specific splice sites leading to exon skipping and intron retention. Thus, the ubiquitin-like protein Hub1 is not a canonical spliceosomal factor needed generally for splicing, but rather a modulator of spliceosome performance and facilitator of alternative splicing.


    Organizational Affiliation

    Department of Molecular Cell Biology, Max Planck Institute of Biochemistry, Am Klopferspitz 18, 82152 Martinsried, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ubiquitin-like protein 5
A, B, G, K, O, S
76Homo sapiensMutation(s): 0 
Gene Names: UBL5
Find proteins for Q9BZL1 (Homo sapiens)
Go to Gene View: UBL5
Go to UniProtKB:  Q9BZL1
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
U4/U6.U5 tri-snRNP-associated protein 1
C, D, H, L, P, T
19Homo sapiensMutation(s): 0 
Gene Names: SART1
Find proteins for O43290 (Homo sapiens)
Go to Gene View: SART1
Go to UniProtKB:  O43290
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.186 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 87.510α = 90.00
b = 103.630β = 90.00
c = 67.000γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
PHASERphasing
MAR345data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-07-16
    Type: Initial release
  • Version 1.1: 2014-08-06
    Type: Database references
  • Version 1.2: 2017-11-22
    Type: Refinement description