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Glycoside Hydrolase Family 151

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Glycoside Hydrolase Family GH151
Clan None
Mechanism Retaining (inferred)
Active site residues Not known
CAZy DB link

Substrate specificities

Members of GH151 are bacterial enzymes presenting α-L-fucosidase activity (EC [1, 2, 3]. Activity has been observed on 4-nitrophenyl-α-L-fucopyranoside (pNP-α-L-Fuc) [2, 3] and on 2-chloro-4-nitrophenyl-α-L-fucopyranoside (CNP-α-L-Fuc) [1]. GH151 α-L-fucosidases are reportedly unable to catalyze hydrolysis of human milk oligosaccharide structures 2'-fucosyllactose (2'FL) and 3-fucosyllactose (3FL) [1, 3], but slight activity has been observed on the blood group H antigen disaccharide Fuc-α-1,2-Gal [1]. No activity was observed on fucosylated xyloglucan [3].

The first characterized members of GH151 were perceived as members of GH29 due to their α-L-fucosidase activity [1, 3]. However, phylogenetic analysis and sequence alignment revealed poor homology to GH29 [1, 3]. Based on the low sequence similarity to GH29, it was suggested that a new GH family be created [2]. Sequence homology to GH42 β-galactosidase trimerization domains has been reported [1, 3]. Consequently, one GH151 α-L-fucosidase was tested for activity on pNP-β-D-Gal, pNP-β-D-Glc, and pNP-β-D-Lac, but none was observed [3].

Kinetics and Mechanism

The catalytic mechanism of GH151 has not been determined, but based on reports that two members of GH151 can catalyze transglycosylation using pNP-α-L-Fuc as donor substrate [2, 3], a retaining mechanism has been inferred.

Catalytic Residues

The catalytic residues of GH151 are unknown.

Three-dimensional structures

No three-dimensional structures have been solved for GH151.

Family Firsts

First stereochemistry determination
Not yet identified.
First catalytic nucleophile identification
Not yet identified.
First general acid/base residue identification
Not yet identified.
First 3-D structure
Not yet solved.


Error fetching PMID 22138995:
Error fetching PMID 26013545:
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  1. Error fetching PMID 22138995: [Sela2012]
  2. Error fetching PMID 26013545: [Benesova2015]
  3. Error fetching PMID 26800369: [Lezyk2016]
All Medline abstracts: PubMed | HubMed