crystal structure of MBP-tagged REV7-IpaB complex

Experimental Data Snapshot

  • Resolution: 2.35 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.192 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


REV7 has a dynamic adaptor region to accommodate small GTPase RAN/ShigellaIpaB ligands, and its activity is regulated by the RanGTP/GDP switch.

Wang, X.Pernicone, N.Pertz, L.Hua, D.Zhang, T.Listovsky, T.Xie, W.

(2019) J Biol Chem 294: 15733-15742

  • DOI: https://doi.org/10.1074/jbc.RA119.010123
  • Primary Citation of Related Structures:  
    6KEA, 6NIF

  • PubMed Abstract: 

    REV7, also termed mitotic arrest-deficient 2-like 2 (MAD2L2 or MAD2B), acts as an interaction module in a broad array of cellular pathways, including translesion DNA synthesis, cell cycle control, and nonhomologous end joining. Numerous REV7 binding partners have been identified, including the human small GTPase Ras-associated nuclear protein (RAN), which acts as a potential upstream regulator of REV7. Notably, the Shigella invasin IpaB hijacks REV7 to disrupt cell cycle control to prevent intestinal epithelial cell renewal and facilitate bacterial colonization. However, the structural details of the REV7-RAN and REV7-IpaB interactions are mostly unknown. Here, using fusion protein and rigid maltose-binding protein tagging strategies, we determined the crystal structures of these two complexes at 2.00-2.35 Å resolutions. The structures revealed that both RAN and IpaB fragments bind the "safety belt" region of REV7, inducing rearrangement of the C-terminal β-sheet region of REV7, conserved among REV7-related complexes. Of note, the REV7-binding motifs of RAN and IpaB each displayed some unique interactions with REV7 despite sharing consensus residues. Structural alignments revealed that REV7 has an adaptor region within the safety belt region that can rearrange secondary structures to fit a variety of different ligands. Our structural and biochemical results further indicated that REV7 preferentially binds GTP-bound RAN, implying that a GTP/GDP-bound transition of RAN may serve as the molecular switch that controls REV7's activity. These results provide insights into the regulatory mechanism of REV7 in cell cycle control, which may help with the development of small-molecule inhibitors that target REV7 activity.

  • Organizational Affiliation

    Department of Molecular Biology, Ariel University, Ariel 40700, Israel.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Maltose-binding periplasmic protein,LINKER,hREV7,LINKER,Invasin IpaB,hREV3
A, B, C, D
631Escherichia coli K-12synthetic constructHomo sapiensShigella flexneriMutation(s): 6 
Gene Names: malEREV3LipaB
UniProt & NIH Common Fund Data Resources
Find proteins for P0AEX9 (Escherichia coli (strain K12))
Explore P0AEX9 
Go to UniProtKB:  P0AEX9
Find proteins for O60673 (Homo sapiens)
Explore O60673 
Go to UniProtKB:  O60673
PHAROS:  O60673
Find proteins for P18011 (Shigella flexneri)
Explore P18011 
Go to UniProtKB:  P18011
Find proteins for Q9UI95 (Homo sapiens)
Explore Q9UI95 
Go to UniProtKB:  Q9UI95
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsQ9UI95P0AEX9P18011O60673
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.35 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.192 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.829α = 90
b = 146.707β = 116.58
c = 102.468γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31600605

Revision History  (Full details and data files)

  • Version 1.0: 2019-09-11
    Type: Initial release
  • Version 1.1: 2019-09-18
    Changes: Data collection, Database references
  • Version 1.2: 2019-11-06
    Changes: Data collection, Database references
  • Version 1.3: 2023-11-22
    Changes: Data collection, Database references, Refinement description