title: Analysis of the Nse3/MAGE-binding domain of the Nse4/EID family proteins.
abstract: BACKGROUND
  The Nse1, Nse3 and Nse4 proteins form a tight sub-complex of the large SMC5-6 protein complex. hNSE3/MAGEG1, the mammalian ortholog of Nse3, is the founding member of the MAGE (melanoma-associated antigen) protein family and the Nse4 kleisin subunit is related to the EID (E1A-like inhibitor of differentiation) family of proteins. We have recently shown that human MAGE proteins can interact with NSE4/EID proteins through their characteristic conserved hydrophobic pocket.
  
  
  RESULTS
  Using mutagenesis and protein-protein interaction analyses, we have identified a new Nse3/MAGE-binding domain (NMBD) of the Nse4/EID proteins. This short domain is located next to the Nse4 N-terminal kleisin motif and is conserved in all NSE4/EID proteins. The central amino acid residues of the human NSE4b/EID3 domain were essential for its binding to hNSE3/MAGEG1 in yeast two-hybrid assays suggesting they form the core of the binding domain. PEPSCAN ELISA measurements of the MAGEC2 binding affinity to EID2 mutant peptides showed that similar core residues contribute to the EID2-MAGEC2 interaction. In addition, the N-terminal extension of the EID2 binding domain took part in the EID2-MAGEC2 interaction. Finally, docking and molecular dynamic simulations enabled us to generate a structure model for EID2-MAGEC2. Combination of our experimental data and the structure modeling showed how the core helical region of the NSE4/EID domain binds into the conserved pocket characteristic of the MAGE protein family.
  
  
  CONCLUSIONS
  We have identified a new Nse4/EID conserved domain and characterized its binding to Nse3/MAGE proteins. The conservation and binding of the interacting surfaces suggest tight co-evolution of both Nse4/EID and Nse3/MAGE protein families.
authors.affiliation: Central European Institute of Technology, Masaryk University, Brno, Czech Republic.
authors.forename: Marc
authors.initials: M
authors.lastname: Guerineau
authors.forename: Zdenek
authors.initials: Z
authors.lastname: Kriz
authors.forename: Lucie
authors.initials: L
authors.lastname: Kozakova
authors.forename: Katerina
authors.initials: K
authors.lastname: Bednarova
authors.forename: Pavel
authors.initials: P
authors.lastname: Janos
authors.forename: Jan
authors.initials: J
authors.lastname: Palecek
mesh_terms: D000595:Amino Acid Sequence; D019943:Amino Acid Substitution; D002352:Carrier Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism; D002868:Chromosomal Proteins, Non-Histone; D003198:Computer Simulation; D017124:Conserved Sequence; D006801:Humans; D051797:Inhibitor of Differentiation Protein 2; D047908:Intracellular Signaling Peptides and Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D008958:Models, Molecular; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D009687:Nuclear Proteins / Q000737:chemistry; D010446:Peptide Fragments / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D011485:Protein Binding; D054730:Protein Interaction Domains and Motifs; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D012568:Schizosaccharomyces; D029702:Schizosaccharomyces pombe Proteins / Q000737:chemistry; D020798:Two-Hybrid System Techniques
chemical_list: D002352:Carrier Proteins; D018797:Cell Cycle Proteins; D002868:Chromosomal Proteins, Non-Histone; C475090:EID2 protein, human; C502085:EID3 protein, human; D051797:Inhibitor of Differentiation Protein 2; D047908:Intracellular Signaling Peptides and Proteins; C469927:NSMCE3 protein, human; C495159:Nse3 protein, S pombe; C493528:Nse4 protein, S pombe; D009687:Nuclear Proteins; D010446:Peptide Fragments; D011994:Recombinant Proteins; C432931:SMC5 protein, human; D029702:Schizosaccharomyces pombe Proteins