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β-1,2-Glucans and associated enzymes

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Abstract

Sugar chains are biopolymers that play various important roles for organisms, and their structures are complex and diverse. Enzymes acting on sugar chains have undergone a wide variety of molecular evolutions. Nevertheless, the limited availability of sugar chains often prevents the investigation of related enzymes, even among enzymes that act on sugar chains comprising only glucose, an essential monosaccharide in nature. Glucans such as starch and cellulose represent a large amount of biomass, and enzymes acting on these glucans have been investigated extensively. In contrast, there is much less known about enzymes acting on glucans with β-1,2-glucosidic linkages (β-1,2-glucans), especially those enzymes involved in degrading β-1,2-glucans. Research on such degrading enzymes has only been undertaken for approximately a decade. In this review, β-1,2-glucan-associated enzymes will be introduced, especially β-1,2-glucan-degrading enzymes such as a glycoside phosphorylase acting on β-1,2-glucooligosaccharides and the identification of two novel β-1,2-glucanases and related enzymes, along with the distribution and physiological role of β-1,2-glucans in nature.

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Abbreviations

ACP:

Acyl carrier protein

BGL:

β-Glucosidase

CBP:

Cellobiose phosphorylase

CβG:

Cyclic β-1,2-glucan

CGS:

Cyclic β-1,2-glucan synthase

CpSGL:

SGL from Chitinophaga pinensis

DP:

Degree of polymerization

G1P:

α-Glucose 1-phosphate

GH:

Glycoside hydrolase family

IaSGT:

IALB_1185 from Ignavibacterium album

Lam2 :

Laminaribiose

LiBGL:

BGL from Listeria innocua

LiSO-BP:

SO-BP from L. innocua

LiSOGP:

SOGP from L. innocua

LpSOGP:

SOGP from Lachnochlostridium phytofermentans

OPG:

Osmoregulated periplasmic glucans

PdSGL:

SGL from Parabacteroides distasonis

SGL:

β-1,2-Glucanase

SO-BP:

Sopn-binding protein

SOGP:

1,2-β-Oligoglucan phosphorylase

Sopn :

β-1,2-Glucooligosaccharide with DP of n

TfSGL:

SGL from Talaromyces funiculosus

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Acknowledgements

The author thanks Edanz (https://jp.edanz.com/ac) for editing a draft of this manuscript.

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Correspondence to Masahiro Nakajima.

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This work was supported in part by JSPS KAKENHI Grant Number 20K05830. The author declares that there is no conflict of interest with the contents of this review article.

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Nakajima, M. β-1,2-Glucans and associated enzymes. Biologia 78, 1741–1757 (2023). https://doi.org/10.1007/s11756-022-01205-5

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  • DOI: https://doi.org/10.1007/s11756-022-01205-5

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