6B7G

Solution NMR structure of BCoR in complex with AF9 (BCoR-AF9)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

BCOR Binding to MLL-AF9 Is Essential for Leukemia via Altered EYA1, SIX, and MYC Activity.

Schmidt, C.R.Achille, N.J.Kuntimaddi, A.Boulton, A.M.Leach, B.I.Zhang, S.Zeleznik-Le, N.J.Bushweller, J.H.

(2020) Blood Cancer Discov 1: 162-177

  • DOI: https://doi.org/10.1158/2643-3230.BCD-20-0036
  • Primary Citation of Related Structures:  
    6B7G

  • PubMed Abstract: 

    MLL is a target of chromosomal translocations in acute leukemias with poor prognosis. The common MLL fusion partner AF9 (MLLT3) can directly bind to AF4, DOT1L, BCOR, and CBX8. To delineate the relevance of BCOR and CBX8 binding to MLL-AF9 for leukemogenesis, here we determine protein structures of AF9 complexes with CBX8 and BCOR, and show that binding of all four partners to AF9 is mutually exclusive. Using the structural analyses, we identify point mutations that selectively disrupt AF9 interactions with BCOR and CBX8. In bone marrow stem/progenitor cells expressing point mutant CBX8 or point mutant MLL-AF9, we show that disruption of direct CBX8/MLL-AF9 binding does not impact in vitro cell proliferation, whereas loss of direct BCOR/MLL-AF9 binding causes partial differentiation and increased proliferation. Strikingly, loss of MLL-AF9/BCOR binding abrogated its leukemogenic potential in a mouse model. The MLL-AF9 mutant deficient for BCOR binding reduces the expression of the EYA1 phosphatase and the protein level of c-Myc. Reduction in BCOR binding to MLL-AF9 alters a MYC-driven gene expression program, as well as altering expression of SIX-regulated genes, likely contributing to the observed reduction in the leukemia-initiating cell population.


  • Organizational Affiliation

    Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, Virginia.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein AF-970Homo sapiensMutation(s): 0 
Gene Names: MLLT3AF9YEATS3
UniProt & NIH Common Fund Data Resources
Find proteins for P42568 (Homo sapiens)
Explore P42568 
Go to UniProtKB:  P42568
PHAROS:  P42568
GTEx:  ENSG00000171843 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP42568
Sequence Annotations
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
BCL-6 corepressor33Homo sapiensMutation(s): 0 
Gene Names: BCORKIAA1575
UniProt & NIH Common Fund Data Resources
Find proteins for Q6W2J9 (Homo sapiens)
Explore Q6W2J9 
Go to UniProtKB:  Q6W2J9
PHAROS:  Q6W2J9
GTEx:  ENSG00000183337 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6W2J9
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-10-10
    Type: Initial release
  • Version 1.1: 2021-04-28
    Changes: Data collection, Database references, Structure summary
  • Version 1.2: 2023-06-14
    Changes: Database references, Other
  • Version 1.3: 2024-05-15
    Changes: Data collection, Database references