3ZTG

Solution structure of the RING finger-like domain of Retinoblastoma Binding Protein-6 (RBBP6)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 400 
  • Conformers Submitted: 32 
  • Selection Criteria: HADDOCK ENERGY, RAMACHANDRAN QUALITY 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Solution Structure of the Ring Finger-Like Domain of Retinoblastoma Binding Protein-6 (Rbbp6) Suggests It Functions as a U-Box

Kappo, M.A.Ab, E.Hassem, F.Atkinson, R.A.Faro, A.Muleya, V.Mulaudzi, T.Poole, J.O.Mckenzie, J.M.Chibi, M.Moolman-Smook, J.C.Rees, D.J.G.Pugh, D.J.R.

(2012) J.Biol.Chem. 287: 7146

  • DOI: 10.1074/jbc.M110.217059

  • PubMed Abstract: 
  • Retinoblastoma-binding protein-6 (RBBP6) plays a facilitating role, through its RING finger-like domain, in the ubiquitination of p53 by Hdm2 that is suggestive of E4-like activity. Although the presence of eight conserved cysteine residues makes it ...

    Retinoblastoma-binding protein-6 (RBBP6) plays a facilitating role, through its RING finger-like domain, in the ubiquitination of p53 by Hdm2 that is suggestive of E4-like activity. Although the presence of eight conserved cysteine residues makes it highly probable that the RING finger-like domain coordinates two zinc ions, analysis of the primary sequence suggests an alternative classification as a member of the U-box family, the members of which do not bind zinc ions. We show here that despite binding two zinc ions, the domain adopts a homodimeric structure highly similar to those of a number of U-boxes. Zinc ions could be replaced by cadmium ions without significantly disrupting the structure or the stability of the domain, although the rate of substitution was an order of magnitude slower than any previous measurement, suggesting that the structure is particularly stable, a conclusion supported by the high thermal stability of the domain. A hallmark of U-box-containing proteins is their association with chaperones, with which they cooperate in eliminating irretrievably unfolded proteins by tagging them for degradation by the proteasome. Using a yeast two-hybrid screen, we show that RBBP6 interacts with chaperones Hsp70 and Hsp40 through its N-terminal ubiquitin-like domain. Taken together with the structural similarities to U-box-containing proteins, our data suggest that RBBP6 plays a role in chaperone-mediated ubiquitination and possibly in protein quality control.


    Organizational Affiliation

    Biotechnology Department, University of the Western Cape, Bellville 7535, South Africa.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
E3 UBIQUITIN-PROTEIN LIGASE RBBP6
A, B
92Homo sapiensMutation(s): 0 
Gene Names: RBBP6 (P2PR, PACT, RBQ1)
EC: 2.3.2.27
Find proteins for Q7Z6E9 (Homo sapiens)
Go to Gene View: RBBP6
Go to UniProtKB:  Q7Z6E9
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 400 
  • Conformers Submitted: 32 
  • Selection Criteria: HADDOCK ENERGY, RAMACHANDRAN QUALITY 
  • Olderado: 3ZTG Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-12-07
    Type: Initial release
  • Version 1.1: 2012-03-14
    Type: Other