Identification of the pyruvate reductase of Chlamydomonas reinhardtii

Experimental Data Snapshot

  • Resolution: 2.46 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.205 

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This is version 1.4 of the entry. See complete history


Identification of the Elusive Pyruvate Reductase of Chlamydomonas reinhardtii Chloroplasts.

Burgess, S.J.Taha, H.Yeoman, J.A.Iamshanova, O.Chan, K.X.Boehm, M.Behrends, V.Bundy, J.G.Bialek, W.Murray, J.W.Nixon, P.J.

(2016) Plant Cell Physiol 57: 82-94

  • DOI: https://doi.org/10.1093/pcp/pcv167
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Under anoxic conditions the green alga Chlamydomonas reinhardtii activates various fermentation pathways leading to the creation of formate, acetate, ethanol and small amounts of other metabolites including d-lactate and hydrogen. Progress has been made in identifying the enzymes involved in these pathways and their subcellular locations; however, the identity of the enzyme involved in reducing pyruvate to d-lactate has remained unclear. Based on sequence comparisons, enzyme activity measurements, X-ray crystallography, biochemical fractionation and analysis of knock-down mutants, we conclude that pyruvate reduction in the chloroplast is catalyzed by a tetrameric NAD(+)-dependent d-lactate dehydrogenase encoded by Cre07.g324550. Its expression during aerobic growth supports a possible function as a 'lactate valve' for the export of lactate to the mitochondrion for oxidation by cytochrome-dependent d-lactate dehydrogenases and by glycolate dehydrogenase. We also present a revised spatial model of fermentation based on our immunochemical detection of the likely pyruvate decarboxylase, PDC3, in the cytoplasm.

  • Organizational Affiliation

    Department of Life Sciences, Sir Ernst Chain Building-Wolfson Laboratories, Imperial College London, S. Kensington Campus, London SW7 2AZ, UK Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK These authors contributed equally to this work.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Putative D-lactate dehydrogenase
A, B, C, D, E
A, B, C, D, E, F, G, H
386Chlamydomonas reinhardtiiMutation(s): 0 
Gene Names: Cre07.g324550
Find proteins for B0LUZ5 (Chlamydomonas reinhardtii)
Explore B0LUZ5 
Go to UniProtKB:  B0LUZ5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB0LUZ5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.46 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.205 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.76α = 90
b = 110.92β = 90.11
c = 193.16γ = 90
Software Package:
Software NamePurpose
xia2data reduction
xia2data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-12-02
    Type: Initial release
  • Version 1.1: 2016-02-03
    Changes: Database references
  • Version 1.2: 2018-04-11
    Changes: Data collection
  • Version 1.3: 2018-09-19
    Changes: Data collection
  • Version 1.4: 2024-01-10
    Changes: Data collection, Database references, Refinement description