Macromolecule Content

• Total Structure Weight: 15257.95 
• Atom Count: 1064 
• Residue Count: 140 
• Unique protein chains: 1

2KU7

Solution structure of MLL1 PHD3-Cyp33 RRM chimeric protein

• DOI: 10.2210/pdb2KU7/pdb

• Classification: TRANSCRIPTION
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2010-02-12 Released: 2010-07-07 
• Deposition Author(s): Song, J., Wang, Z., Patel, D.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Pro isomerization in MLL1 PHD3-bromo cassette connects H3K4me readout to CyP33 and HDAC-mediated repression.

Wang, Z., Song, J., Milne, T.A., Wang, G.G., Li, H., Allis, C.D., Patel, D.J.

(2010) Cell 141: 1183-1194

• PubMed: 20541251 
• DOI: 10.1016/j.cell.2010.05.016
• Primary Citation of Related Structures:  
  3LQJ, 3LQI, 3LQH, 3LPY


• PubMed Abstract: 
  

The MLL1 gene is a frequent target for recurrent chromosomal translocations, resulting in transformation of hematopoietic precursors into leukemia stem cells. Here, we report on structure-function studies that elucidate molecular events in MLL1 binding of histone H3K4me3/2 marks and recruitment of the cyclophilin CyP33. CyP33 contains a PPIase and a RRM domain and regulates MLL1 function through HDAC recruitment. We find that the PPIase domain of CyP33 regulates the conformation of MLL1 through proline isomerization within the PHD3-Bromo linker, thereby disrupting the PHD3-Bromo interface and facilitating binding of the MLL1-PHD3 domain to the CyP33-RRM domain. H3K4me3/2 and CyP33-RRM target different surfaces of MLL1-PHD3 and can bind simultaneously to form a ternary complex. Furthermore, the MLL1-CyP33 interaction is required for repression of HOXA9 and HOXC8 genes in vivo. Our results highlight the role of PHD3-Bromo cassette as a regulatory platform, orchestrating MLL1 binding of H3K4me3/2 marks and cyclophilin-mediated repression through HDAC recruitment.

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Organizational Affiliation: 

Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
MLL1 PHD3-Cyp33 RRM chimeric protein	A	140	Homo sapiens	Mutation(s): 0  Gene Names: PPIE (CYP33), KMT2A (ALL1, CXXC7, HRX, HTRX, MLL, MLL1, TRX1) EC: 5.2.1.8 2.1.1.43
Find proteins for Q9UNP9 (Homo sapiens) Go to Gene View: PPIE Go to UniProtKB:  Q9UNP9
Find proteins for Q03164 (Homo sapiens) Go to Gene View: KMT2A Go to UniProtKB:  Q03164

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-02-12 
• Released Date: 2010-07-07 
• Deposition Author(s): Song, J., Wang, Z., Patel, D.

Revision History 

• Version 1.0: 2010-07-07
  Type: Initial release
• Version 1.1: 2011-07-13
  Type: Version format compliance