CurF ER cyclopropanase from curacin A biosynthetic pathway

Experimental Data Snapshot

  • Resolution: 0.96 Å
  • R-Value Free: 0.131 
  • R-Value Work: 0.117 
  • R-Value Observed: 0.117 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Structural Basis for Cyclopropanation by a Unique Enoyl-Acyl Carrier Protein Reductase.

Khare, D.Hale, W.A.Tripathi, A.Gu, L.Sherman, D.H.Gerwick, W.H.Hakansson, K.Smith, J.L.

(2015) Structure 23: 2213-2223

  • DOI: https://doi.org/10.1016/j.str.2015.09.013
  • Primary Citation of Related Structures:  
    5DOV, 5DOZ, 5DP1, 5DP2

  • PubMed Abstract: 

    The natural product curacin A, a potent anticancer agent, contains a rare cyclopropane group. The five enzymes for cyclopropane biosynthesis are highly similar to enzymes that generate a vinyl chloride moiety in the jamaicamide natural product. The structural biology of this remarkable catalytic adaptability is probed with high-resolution crystal structures of the curacin cyclopropanase (CurF ER), an in vitro enoyl reductase (JamJ ER), and a canonical curacin enoyl reductase (CurK ER). The JamJ and CurK ERs catalyze NADPH-dependent double bond reductions typical of enoyl reductases (ERs) of the medium-chain dehydrogenase reductase (MDR) superfamily. Cyclopropane formation by CurF ER is specified by a short loop which, when transplanted to JamJ ER, confers cyclopropanase activity on the chimeric enzyme. Detection of an adduct of NADPH with the model substrate crotonyl-CoA provides indirect support for a recent proposal of a C2-ene intermediate on the reaction pathway of MDR enoyl-thioester reductases.

  • Organizational Affiliation

    Department of Chemistry, University of Michigan, Ann Arbor, MI 48109-1055, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CurF342Lyngbya majusculaMutation(s): 0 
Gene Names: curF
Find proteins for Q6DNE7 (Lyngbya majuscula)
Explore Q6DNE7 
Go to UniProtKB:  Q6DNE7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6DNE7
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NAP

Download Ideal Coordinates CCD File 
C21 H28 N7 O17 P3
Experimental Data & Validation

Experimental Data

  • Resolution: 0.96 Å
  • R-Value Free: 0.131 
  • R-Value Work: 0.117 
  • R-Value Observed: 0.117 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 108.906α = 90
b = 47.294β = 123.44
c = 76.902γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States--

Revision History  (Full details and data files)

  • Version 1.0: 2015-11-18
    Type: Initial release
  • Version 1.1: 2015-12-16
    Changes: Database references
  • Version 1.2: 2017-09-27
    Changes: Author supporting evidence, Database references, Derived calculations
  • Version 1.3: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.4: 2023-09-27
    Changes: Data collection, Database references, Refinement description