A novel unsaturated β-glucuronyl hydrolase involved in ulvan degradation unveils the versatility of stereochemistry requirements in family GH105
Open accessAbstract
Ulvans are cell wall matrix polysaccharides in green algae belonging to the genus Ulva. Enzymatic degradation of the polysaccharide by ulvan lyases leads to the production of oligosaccharides with an unsaturated β-glucuronyl residue located at the non-reducing end. Exploration of the genomic environment around the Nonlabens ulvanivorans (previously Percicivirga ulvanivorans) ulvan lyase revealed a gene highly similar to known unsaturated uronyl hydrolases classified in the CAZy glycoside hydrolase family 105. The gene was cloned, the protein was overexpressed in Escherichia coli, and enzymology experiments demonstrated its unsaturated β-glucuronyl activity. Kinetic analysis of purified oligo-ulvans incubated with the new enzyme showed that the full substrate specificity is attained by three subsites that preferentially bind anionic residues (sulfated rhamnose, glucuronic/iduronic acid). The three-dimensional crystal structure of the native enzyme reveals that a trimeric organization is required for substrate binding and recognition at the +2 binding subsite. This novel unsaturated β-glucuronyl hydrolase is part of a previously uncharacterized subgroup of GH105 members and exhibits only a very limited sequence similarity to known unsaturated β-glucuronyl sequences previously found only in family GH88. Clan-O formed by families GH88 and GH105 was singular in the fact that it covered families acting on both axial and equatorial glycosidic linkages, respectively. The overall comparison of active site structures between enzymes from these two families highlights how that within family GH105, and unlike for classical glycoside hydrolysis, the hydrolysis of vinyl ether groups from unsaturated saccharides occurs independently of the α or β configuration of the cleaved linkage.
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Ulvan is comprised of sulfated rhamnose, glucuronic acid, iduronic acid, xylose, and sulfated xylose.
“It is comprised of sulfated rhamnose, glucuronic acid, iduronic acid, xylose, and sulfated xylose.”
From The Enzymatic Conversion of Major Algal and Cyanobacterial Carbohydrates to Bioethanol (2016) · cites this paper as Collén et al., 2014
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The Enzymatic Conversion of Major Algal and Cyanobacterial Carbohydrates to Bioethanol
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- Authors
- Collén, P. N., Jeudy, A., Sassi, J.-F., Groisillier, A., Czjzek, M., Coutinho, P. M., & Helbert, W.
- Affiliations
- Centre National de la Recherche Scientifique (FR)
- Centre d’Étude et de Valorisation des Algues (FR)
- Corresponding author
- Helbert, William
- ORCID
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 2014-02
- Volume
- 289
- Issue
- 9
- Pages
- 6199-6211
- ISSN
- 0021-9258 (ISSN-L)
- PMC
- PMC3937685
- OpenAlex
- W2132938224
- Cited by
- 47
- References
- 43
- Citations by year
- 2026: 1 · 2025: 3 · 2024: 2 · 2023: 3 · 2022: 2 · 2021: 6 · 2020: 3 · 2019: 5 · 2018: 5 · 2017: 8 · 2016: 3 · 2015: 2 · 2014: 4
- FWCI
- 6.61
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Biological Chemistry (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- HAL (submittedVersion)
- Funders
- Agence Nationale de la Recherche (ANR-10-BTBR-0004)
- Centre National de la Recherche Scientifique
- Topics
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Polysaccharides and Plant Cell Walls
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biotechnology › Enzyme Production and Characterization
- Physical Sciences › Chemistry › Organic Chemistry › Carbohydrate Chemistry and Synthesis
- Keywords
- ulvan lyase, substrate specificity, glucuronic acid, iduronic acid, Ulva
- MeSH terms
- Bacterial Proteins, Glycoside Hydrolases, Hydrolysis, Kinetics, Polysaccharides, Recombinant Proteins, Substrate Specificity, Flavobacteriaceae
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