Enterococcus faecalis FIC protein in complex with ADP.

Experimental Data Snapshot

  • Resolution: 1.93 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 

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This is version 1.3 of the entry. See complete history


A Ca2+-regulated deAMPylation switch in human and bacterial FIC proteins.

Veyron, S.Oliva, G.Rolando, M.Buchrieser, C.Peyroche, G.Cherfils, J.

(2019) Nat Commun 10: 1142-1142

  • DOI: https://doi.org/10.1038/s41467-019-09023-1
  • Primary Citation of Related Structures:  
    5NV5, 5NWF, 6EP0, 6EP2, 6EP5, 6ER8, 6ERB

  • PubMed Abstract: 

    FIC proteins regulate molecular processes from bacteria to humans by catalyzing post-translational modifications (PTM), the most frequent being the addition of AMP or AMPylation. In many AMPylating FIC proteins, a structurally conserved glutamate represses AMPylation and, in mammalian FICD, also supports deAMPylation of BiP/GRP78, a key chaperone of the unfolded protein response. Currently, a direct signal regulating these FIC proteins has not been identified. Here, we use X-ray crystallography and in vitro PTM assays to address this question. We discover that Enterococcus faecalis FIC (EfFIC) catalyzes both AMPylation and deAMPylation and that the glutamate implements a multi-position metal switch whereby Mg 2+ and Ca 2+ control AMPylation and deAMPylation differentially without a conformational change. Remarkably, Ca 2+ concentration also tunes deAMPylation of BiP by human FICD. Our results suggest that the conserved glutamate is a signature of AMPylation/deAMPylation FIC bifunctionality and identify metal ions as diffusible signals that regulate such FIC proteins directly.

  • Organizational Affiliation

    CNRS and Ecole normale supérieure Paris-Saclay, Laboratoire de Biologie et Pharmacologie Appliquée, 61 Avenue du Président Wilson, 94235, Cachan CEDEX, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fic family protein
A, B, C, D, E
A, B, C, D, E, F
207Enterococcus faecalisMutation(s): 0 
Gene Names: D350_01176
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.93 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.836α = 90
b = 87.836β = 90
c = 364.936γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
DIM MalinfFrance--

Revision History  (Full details and data files)

  • Version 1.0: 2019-02-06
    Type: Initial release
  • Version 1.1: 2019-02-13
    Changes: Data collection, Database references, Structure summary
  • Version 1.2: 2019-03-20
    Changes: Data collection, Database references
  • Version 1.3: 2024-01-17
    Changes: Data collection, Database references, Refinement description