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Metagenomic discovery of feruloyl esterases from rumen microflora

  • Dominic W. S. WongEmail author
  • Victor J. Chan
  • Hans Liao
Biotechnologically relevant enzymes and proteins
  • 57 Downloads

Abstract

Feruloyl esterases (FAEs) are a key group of enzymes that hydrolyze ferulic acids ester-linked to plant polysaccharides. The cow’s rumen is a highly evolved ecosystem of complex microbial microflora capable of converting fibrous substances to energy. From direct cloning of the rumen microbial metagenome, we identified seven active phagemids conferring feruloyl esterase activity. The genomic inserts ranged from 1633 to 4143 bp, and the ORFs from 681 to 1359 bp. BLAST search reveals sequence homology to feruloyl esterases and esterases/lipases identified in anaerobes. The seven genes were expressed in Escherichia coli, and the proteins were purified to homogeneity. The FAEs were found to cover types B, C, and D in the feruloyl esterase classification system using model hydroxycinnamic acid esters. The release of ferulic acid (FA) catalyzed by these enzymes was established using natural substrates corn fiber (CF) and wheat insoluble arabinoxylan (WIA). Three of the enzymes were demonstrated to cleave diferulates and hence the capability to break down Araf-FA-FA-Araf cross-links. The wide variation in the sequence, activity, and substrate specificity observed in the FAEs discovered in this study is a confirming evidence that combined actions of a full range of FAE enzymes contribute to the high-efficiency fiber digestion in the rumen microbial ecosystem.

Keywords

Feruloyl esterase Ferulic acid Diferulate Metagenome Rumen 

Notes

Compliance with ethical standards

Disclaimer

Reference to a company and/or products is only for purposes of information and does not imply approval of recommendation of the product to the exclusion of others that may also be suitable. All programs and services of the US Department of Agriculture are offered on a nondiscriminatory basis without regard to race, color, national origin, religion, sex, age, marital status, or handicap.

Ethical statement

This work has been performed in compliance with ethical standards. Authors declare they have no conflict of interest. The article does not contain any studies with human participation performed by any of the authors. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed.

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply 2019

Authors and Affiliations

  1. 1.Western Regional Research Center, USDA-ARSAlbanyUSA
  2. 2.Cargill Biotechnology Development CenterMinneapolisUSA

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