The ZZ domain of cytoplasmic polyadenylation element binding protein 1 (CPEB1)

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


The C-Terminal Region of Cytoplasmic Polyadenylation Element Binding Protein Is a ZZ Domain with Potential for Protein-Protein Interactions.

Merkel, D.J.Wells, S.B.Hilburn, B.C.Elazzouzi, F.Perez-Alvarado, G.C.Lee, B.M.

(2013) J Mol Biol 425: 2015-2026

  • DOI: https://doi.org/10.1016/j.jmb.2013.03.009
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Cytoplasmic polyadenylation element binding protein (CPEB) provides temporal and spatial control of protein synthesis required for early development and neuronal synaptic plasticity. CPEB regulates protein expression by inhibiting polyadenylation of selected mRNA transcripts, which prevents binding of the ribosome for protein synthesis. Two RNA recognition motif domains and a C-terminal binuclear zinc-binding domain are required for mRNA binding, but the zinc-binding domain is not required for sequence-specific recognition of the targeted mRNA transcript. The structure and function of the zinc-binding domain of CPEB are unknown. The C-terminal region of CPEB may participate in assembly of the ribonucleoprotein complex that includes the scaffold protein, Symplekin, and the cleavage and polyadenylation specificity factor. Sumoylation of Symplekin is required for polyadenylation, and both cleavage and polyadenylation specificity factor and poly(A) polymerase are sumoylated. The foreshortened poly(A) tail is maintained by poly(A) ribonuclease, which associates with CPEB. While zinc-binding domains are renowned for nucleic acid recognition, binuclear zinc-binding structural motifs, such as LIM (Lin-11, Isl-1, Mec-3), RING (really interesting new gene), PHD (plant homeodomain) and ZZ (ZZ-type zinc finger) domains, participate in protein-protein interactions. Here, we report the solution structure of the C-terminal zinc-binding domain of CPEB1 (CPEB1-ZZ), which has a cross-braced zinc binding topology. The structural similarity to other ZZ domains suggests that the CPEB1-ZZ domain recruits sumoylated proteins during assembly of the ribonucleoprotein complex prior to mRNA export from the nucleus.

  • Organizational Affiliation

    Department of Chemistry and Biochemistry, Southern Illinois University, 1245 Lincoln Drive MC 4409, Carbondale, IL 62901, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cytoplasmic polyadenylation element-binding protein 165Homo sapiensMutation(s): 0 
Gene Names: CPEBCPEB1
UniProt & NIH Common Fund Data Resources
Find proteins for Q9BZB8 (Homo sapiens)
Explore Q9BZB8 
Go to UniProtKB:  Q9BZB8
GTEx:  ENSG00000214575 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9BZB8
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on ZN

Download Ideal Coordinates CCD File 
B [auth A],
C [auth A]
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • 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: 2013-04-03
    Type: Initial release
  • Version 1.1: 2013-07-03
    Changes: Database references
  • Version 1.2: 2024-05-01
    Changes: Data collection, Database references, Derived calculations