2LP0

The solution structure of homeodomain-protein complex


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the least restraint violations 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structural basis for homeodomain recognition by the cell-cycle regulator Geminin

Zhou, B.Liu, C.Xu, Z.Zhu, G.

(2012) Proc.Natl.Acad.Sci.USA --: --

  • DOI: 10.1073/pnas.1200874109

  • PubMed Abstract: 
  • Homeodomain-containing transcription factors play a fundamental role in the regulation of numerous developmental and cellular processes. Their multiple regulatory functions are accomplished through context-dependent inputs of target DNA sequences and ...

    Homeodomain-containing transcription factors play a fundamental role in the regulation of numerous developmental and cellular processes. Their multiple regulatory functions are accomplished through context-dependent inputs of target DNA sequences and collaborating protein partners. Previous studies have well established the sequence-specific DNA binding to homeodomains; however, little is known about how protein partners regulate their functions through targeting homeodomains. Here we report the solution structure of the Hox homeodomain in complex with the cell-cycle regulator, Geminin, which inhibits Hox transcriptional activity and enrolls Hox in cell proliferative control. Side-chain carboxylates of glutamates and aspartates in the C terminus of Geminin generate an overall charge pattern resembling the DNA phosphate backbone. These residues provide electrostatic interactions with homeodomain, which combine with the van der Waals contacts to form the stereospecific complex. We further showed that the interaction with Geminin is homeodomain subclass-selective and Hox paralog-specific, which relies on the stapling role of residues R43 and M54 in helix III and the basic amino acid cluster in the N terminus. Interestingly, we found that the C-terminal residue Ser184 of Geminin could be phosphorylated by Casein kinase II, resulting in the enhanced binding to Hox and more potent inhibitory effect on Hox transcriptional activity, indicating an additional layer of regulation. This structure provides insight into the molecular mechanism underlying homeodomain-protein recognition and may serve as a paradigm for interactions between homeodomains and DNA-competitive peptide inhibitors.


    Organizational Affiliation

    Division of Life Science and State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Kowloon, Hong Kong.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Homeobox protein Hox-C9
A
60Homo sapiensMutation(s): 0 
Gene Names: HOXC9 (HOX3B)
Find proteins for P31274 (Homo sapiens)
Go to Gene View: HOXC9
Go to UniProtKB:  P31274
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Geminin
B
20Homo sapiensMutation(s): 0 
Gene Names: GMNN
Find proteins for O75496 (Homo sapiens)
Go to Gene View: GMNN
Go to UniProtKB:  O75496
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the least restraint violations 
  • Olderado: 2LP0 Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-06-06
    Type: Initial release