Structure of the R domain of carboxylic acid reductase (CAR) from Mycobacterium marinum in complex with NADP, P21 form

Experimental Data Snapshot

  • Resolution: 1.74 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 

wwPDB Validation   3D Report Full Report

This is version 1.3 of the entry. See complete history


Structures of carboxylic acid reductase reveal domain dynamics underlying catalysis.

Gahloth, D.Dunstan, M.S.Quaglia, D.Klumbys, E.Lockhart-Cairns, M.P.Hill, A.M.Derrington, S.R.Scrutton, N.S.Turner, N.J.Leys, D.

(2017) Nat Chem Biol 13: 975-981

  • DOI: https://doi.org/10.1038/nchembio.2434
  • Primary Citation of Related Structures:  
    5MSC, 5MSD, 5MSO, 5MSP, 5MSR, 5MSS, 5MST, 5MSU, 5MSV, 5MSW

  • PubMed Abstract: 

    Carboxylic acid reductase (CAR) catalyzes the ATP- and NADPH-dependent reduction of carboxylic acids to the corresponding aldehydes. The enzyme is related to the nonribosomal peptide synthetases, consisting of an adenylation domain fused via a peptidyl carrier protein (PCP) to a reductase termination domain. Crystal structures of the CAR adenylation-PCP didomain demonstrate that large-scale domain motions occur between the adenylation and thiolation states. Crystal structures of the PCP-reductase didomain reveal that phosphopantetheine binding alters the orientation of a key Asp, resulting in a productive orientation of the bound nicotinamide. This ensures that further reduction of the aldehyde product does not occur. Combining crystallography with small-angle X-ray scattering (SAXS), we propose that molecular interactions between initiation and termination domains are limited to competing PCP docking sites. This theory is supported by the fact that (R)-pantetheine can support CAR activity for mixtures of the isolated domains. Our model suggests directions for further development of CAR as a biocatalyst.

  • Organizational Affiliation

    Diamond Light Source, Harwell Science and Innovation Campus, Didcot, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Carboxylic acid reductaseA [auth C],
B [auth A],
C [auth B]
1,174Mycobacterium marinum MMutation(s): 0 
Gene Names: carfadD9MMAR_2117
EC: 1.2.1
Find proteins for B2HN69 (Mycobacterium marinum (strain ATCC BAA-535 / M))
Explore B2HN69 
Go to UniProtKB:  B2HN69
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB2HN69
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.74 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.54α = 90
b = 58.95β = 105.92
c = 135.56γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-07-05
    Type: Initial release
  • Version 1.1: 2017-07-12
    Changes: Database references
  • Version 1.2: 2017-07-26
    Changes: Database references
  • Version 1.3: 2017-08-30
    Changes: Database references