The Structure of variant K294A of the Mo-insertase domain Cnx1E from Arabidopsis thaliana in complex with AMP

Experimental Data Snapshot

  • Resolution: 1.81 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 

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The functional principle of eukaryotic molybdenum insertases.

Krausze, J.Hercher, T.W.Zwerschke, D.Kirk, M.L.Blankenfeldt, W.Mendel, R.R.Kruse, T.

(2018) Biochem J 475: 1739-1753

  • DOI: https://doi.org/10.1042/BCJ20170935
  • Primary Citation of Related Structures:  
    6ETD, 6ETF, 6ETH, 6GAX, 6GB0, 6GB4, 6GB9, 6GBC, 6GBF

  • PubMed Abstract: 

    The molybdenum cofactor (Moco) is a redox-active prosthetic group found in the active site of Moco-dependent enzymes, which are vitally important for life. Moco biosynthesis involves several enzymes that catalyze the subsequent conversion of GTP into cyclic pyranopterin monophosphate (cPMP), molybdopterin (MPT), adenylated MPT (MPT-AMP), and finally Moco. While the underlying principles of cPMP, MPT, and MPT-AMP formation are well understood, the molybdenum insertase (Mo-insertase)-catalyzed final Moco maturation step is not. In the present study, we analyzed high-resolution X-ray datasets of the plant Mo-insertase Cnx1E that revealed two molybdate-binding sites within the active site, hence improving the current view on Cnx1E functionality. The presence of molybdate anions in either of these sites is tied to a distinctive backbone conformation, which we suggest to be essential for Mo-insertase molybdate selectivity and insertion efficiency.

  • Organizational Affiliation

    Department of Plant Biology, Braunschweig University of Technology, 38106 Braunschweig, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Molybdopterin biosynthesis protein CNX1471Arabidopsis thalianaMutation(s): 1 
Gene Names: CNX1At5g20990F22D1.6T10F18.20
EC: (PDB Primary Data), (PDB Primary Data)
Find proteins for Q39054 (Arabidopsis thaliana)
Explore Q39054 
Go to UniProtKB:  Q39054
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ39054
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.81 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.47α = 90
b = 123.42β = 90
c = 132.28γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
STARANISOdata scaling
Cootmodel building

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

  • Released Date: 2018-07-18 
  • Deposition Author(s): Krausze, J.

Revision History  (Full details and data files)

  • Version 1.0: 2018-07-18
    Type: Initial release
  • Version 1.1: 2024-01-17
    Changes: Data collection, Database references, Derived calculations, Refinement description