F218V mutant of the substrate-free form of red chlorophyll catabolite reductase from Arabidopsis thaliana

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.224 

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Crystal structures of the substrate-bound forms of red chlorophyll catabolite reductase: implications for site-specific and stereospecific reaction

Sugishima, M.Okamoto, Y.Noguchi, M.Kohchi, T.Tamiaki, H.Fukuyama, K.

(2010) J Mol Biol 402: 879-891

  • DOI: https://doi.org/10.1016/j.jmb.2010.08.021
  • Primary Citation of Related Structures:  
    3AGA, 3AGB, 3AGC

  • PubMed Abstract: 

    Red chlorophyll catabolite reductase (RCCR) catalyzes the ferredoxin-dependent reduction of the C20/C1 double bond of red chlorophyll catabolite (RCC), the catabolic intermediate produced in chlorophyll degradation. The crystal structure of substrate-free Arabidopsis thaliana RCCR (AtRCCR) demonstrated that RCCR folds into a characteristic α/β/α sandwich, similar to that observed in the ferredoxin-dependent bilin reductase (FDBR) family. Here we have determined the crystal structures of RCC-bound AtRCCR, RCC-bound F218V AtRCCR, and substrate-free F218V AtRCCR, a mutant protein that produces the stereoisomer of primary fluorescent chlorophyll catabolites at the C1 position. RCC is bound to the pocket between the β-sheet and the C-terminal α-helices, as seen in substrate-bound FDBRs, but RCC binding to RCCR is much looser than substrate binding to FDBRs. The loose binding seems beneficial to the large conformational change in RCC upon reduction. Two conserved acidic residues, Glu154 and Asp291, sandwich the C20/C1 double bond of RCC, suggesting that these two residues are involved in site-specific reduction. The RCC in F218V AtRCCR rotates slightly compared with that in wild type to fill in the space generated by the substitution of Phe218 with valine. Concomitantly, the two carboxy groups of Glu154 and Asp291 move slightly away from the C20/C1 double bond. The geometrical arrangement of RCC and the carboxy groups of Glu154 and Asp291 in RCCR would appear to be essential for the stereospecificity of the RCCR reaction.

  • Organizational Affiliation

    Department of Medical Biochemistry, Kurume University School of Medicine, Fukuoka 830-0011, Japan. sugishima_masakazu@med.kurume-u.ac.jp

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Red chlorophyll catabolite reductase, chloroplastic
A, B
276Arabidopsis thalianaMutation(s): 1 
Gene Names: RCCRACD2At4g37000C7A10_360
Find proteins for Q8LDU4 (Arabidopsis thaliana)
Explore Q8LDU4 
Go to UniProtKB:  Q8LDU4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8LDU4
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.292 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.224 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.141α = 90
b = 84.431β = 90
c = 132.248γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-09-01
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2014-01-22
    Changes: Database references
  • Version 1.3: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description