, Volume 229, Issue 2, pp 311–321 | Cite as

Activity of an atypical Arabidopsis thaliana pectin methylesterase

  • Sarah Dedeurwaerder
  • Laurence Menu-Bouaouiche
  • Alain Mareck
  • Patrice Lerouge
  • François GuerineauEmail author
Original Article


An Arabidopsis thaliana pectin methylesterase that was not predicted to contain any signaling sequence was produced in E. coli and purified using a His tag added at its N-terminus. The enzyme demethylesterified Citrus pectin with a K m of 0.86 mg/ml. The enzyme did not require salt for activity and was found to be relatively temperature-sensitive. The precipitation of enzyme-treated pectin by CaCl2 suggested that the enzyme had a blockwise mode of pectin demethylesterification. A purified kiwi (Actinidia chinensis) pectin methylesterase inhibitor had no effect on the activity of the enzyme whereas it strongly inhibited a flax pectin methylesterase. A model of the protein structure revealed that an extra amino acid sequence in this particular Arabidopsis pectin methylesterase could form a ß-strand outside the core structure, which might be preventing the inhibitor from binding the protein.


3-D modelling Arabidopsis Cell wall Pectin methylesterase Pectin methylesterase inhibitor 



Degree of esterification


Pectin methylesterase


Pectin methylesterase inhibitor



We thank Françoise Fournet (UPJV, Amiens) for excellent technical assistance, Prof. Catherine Sarazin (UPJV, Amiens) for helpful discussions, Dr. Matladi Ndlovu (ULB, Bruxelles) for critical reading of the manuscript, CRIHAN (centre de ressources informatiques Haute-Normandie) for molecular modelling support, and RIKEN for the AtPME31 cDNA clone.


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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Sarah Dedeurwaerder
    • 1
    • 3
  • Laurence Menu-Bouaouiche
    • 2
  • Alain Mareck
    • 2
  • Patrice Lerouge
    • 2
  • François Guerineau
    • 1
    Email author
  1. 1.Université de Picardie Jules VerneAmiensFrance
  2. 2.Laboratoire Glycobiologie et Transports chez les Végétaux, FRE CNRS 3090, IFRMP23, Faculté des Sciences Université de RouenMont-Saint-Aignan CedexFrance
  3. 3.Laboratoire d’épigénétique du Cancer, Faculté de Médecine Université Libre de BruxellesBrusselsBelgium

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