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Defining Substrate Specificities for Lipase and Phospholipase Candidates
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Sequence and structure-based method to predict diacylglycerol lipases in protein sequence.

Shahid Ali1, Xiaohui Liu1, Lin Sen1

  • 1School of Food Science and Engineering, South China University of Technology, Guangzhou 510640, People's Republic of China.

International Journal of Biological Macromolecules
|April 9, 2021
PubMed
Summary

Researchers identified key structural features of diacylglyceride lipases (DAG) to discover new enzymes. This method efficiently finds novel DAG lipases for biotechnology and the food industry.

Keywords:
Conserved motifsDiacylglycerol lipaseEnzyme engineeringPattern recognitionStructural conservationStructure predictionSubstrate specificity

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Area of Science:

  • Biotechnology
  • Enzymology
  • Protein Engineering

Background:

  • Diacylglyceride lipases (DAG) are crucial in biotechnology and food industries.
  • Limited thermostability and activity hinder DAG lipase applications compared to triacylglycerol (TAG) lipases.
  • Understanding DAG lipase substrate specificity is essential for enzyme engineering.

Purpose of the Study:

  • Identify structural motifs responsible for DAG specificity.
  • Develop a method to discover novel DAG lipases.
  • Address the limited availability of DAG lipases for industrial use.

Main Methods:

  • Comparative structural analysis of DAG and TAG lipases.
  • Identification of consensus structural motifs for DAG specificity.
  • Bioinformatic screening of protein sequences using motifs and predicted secondary structures.
  • Experimental validation of predicted DAG lipases through expression and activity assays.

Main Results:

  • Structural consensus motifs contributing to DAG specificity were identified.
  • A method for predicting new DAG lipases was established.
  • 83 new putative DAG lipases were discovered.
  • Functional assays confirmed the DAG and TAG specific activity of selected novel lipases.

Conclusions:

  • The study provides insights into the molecular basis of DAG lipase specificity.
  • An efficient and cost-effective method for discovering novel DAG lipases was developed.
  • The identified DAG lipases hold potential for applications in the food industry and biotechnology.