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[Research progress in structure and function of pectin methylesterase].

Sheng Wang1, Kun Meng1, Huiying Luo1

  • 1Key Laboratory for Feed Biotechnology of the Ministry of Agriculture and Rural Affairs, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China.

Sheng Wu Gong Cheng Xue Bao = Chinese Journal of Biotechnology
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Summary

Pectin methylesterase (PME) enzymes modify pectin by removing methyl groups. This review details PME

Keywords:
active sitecatalytic mechanismcrystal structurepectin methylesterasesubstrate specificity

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Area of Science:

  • Biochemistry
  • Enzymology
  • Structural Biology

Background:

  • Pectin methylesterase (PME) is a crucial enzyme in pectin modification, releasing methanol and reducing pectin's methylation degree.
  • PME has significant industrial applications in food processing, beverages, and paper manufacturing.
  • Understanding PME's structure and function is key to optimizing its industrial use.

Purpose of the Study:

  • To systematically review the structural and functional aspects of Pectin methylesterase (PME).
  • To analyze the catalytic mechanism and substrate specificity of PME based on reported crystal structures.
  • To provide insights into the recognition mechanisms between PME's active sites and its substrates.

Main Methods:

  • Review and analysis of reported crystal structures of Pectin methylesterase (PME) from various sources.
  • Examination of the identified right-hand parallel β-helix structural motif of PME.
  • Analysis of the roles of catalytic residues (two aspartic acids and a glutamine) in the enzymatic process.

Main Results:

  • Pectin methylesterase (PME) exhibits a conserved right-hand parallel β-helix fold across different sources.
  • The catalytic active site involves two aspartic acids and a glutamine, functioning as general acid-base, nucleophile, and stabilizing intermediates.
  • Substrate specificity analysis reveals key recognition mechanisms between PME and its pectin substrates.

Conclusions:

  • The structural and catalytic insights into Pectin methylesterase (PME) are essential for its biotechnological applications.
  • Further research into PME's substrate interactions can lead to enzyme engineering for specific industrial needs.
  • This review consolidates current knowledge on PME structure, catalysis, and specificity.