Diverse and common features of trehalases and their contributions to microbial trehalose metabolism
Trehalose is a stable disaccharide that consists of two glucose units linked primarily by an α,α-(1 → 1)-linkage, and it has been found in a wide variety of organisms. In these organisms, trehalose functions not only as a source of carbon energy but also as a protector against various stress conditions. In addition, this disaccharide is attractive for use in a wide range of applications due to its bioactivities. In trehalose metabolism, direct trehalose-hydrolyzing enzymes are known as trehalases, which have been reported for bacteria, archaea, and eukaryotes, and are classified into glycoside hydrolase 37 (GH37), GH65, and GH15 families according to the Carbohydrate-Active enZyme (CAZy) database. The catalytic domains (CDs) of these enzymes commonly share (α/α)6-barrel structures and have two amino acid residues, Asp and/or Glu, that function as catalytic residues in an inverting mechanism. In this review, I focus on diverse and common features of trehalases within different GH families and their contributions to microbial trehalose metabolism.
KeywordsTrehalase Glycoside hydrolase (GH) family GH15 GH37 GH65 Trehalose metabolism
This study was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI (Grant Number 17K07729).
Compliance with ethical standards
Conflict of interest
The author declares that he has no conflicts of interest.
This article does not contain any studies with human participants or animals.
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