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Characterization and stabilization of the α-L-fucosidase set from Lacticaseibacillus rhamnosus INIA P603

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Abstract

This study describes the molecular identification, biochemical characterization, and stabilization of three recombinant AlfA, AlfB, and AlfC fucosidases from Lacticaseibacillus rhamnosus INIA P603. Even though previous studies revealed the presence of fucosidase activity in L. rhamnosus extracts, the identification of the fucosidases, their physicochemical properties, and the substrate spectrum remained unknown. Although the presence of alfB is not common in strains of L. rhamnosus, fucosidases from L. rhamnosus INIA P603 were selected because this strain exhibited higher fucosidase activity in culture and the complete set of fucosidases. A high yield of purified recombinant AlfA, AlfB, and AlfC fucosidases was obtained (8, 12, and 18 mg, respectively). AlfA, AlfB, and AlfC showed their optimal activities at pH 5.0 and 4.0 at 60 °C, 40 °C, and 50 °C, respectively. Unlike 3-fucosyllactose, all three recombinant fucosidases were able to hydrolyze 2′-fucosyllactose (2′-FL), and their activities were improved through their immobilization on agarose supports. Nevertheless, immobilized AlfB exhibited the highest hydrolysis, releasing 39.6 µmol of fucose mg enzyme−1 min−1. Only the immobilized AlfB was able to synthetize 2′-FL. In conclusion, the enzymatic properties elucidated in this study support the potential ability of fucosidases from L. rhamnosus INIA P603 to hydrolyze fucosylated substrates as well as justifying interest for further research into AlfB for its application to catalyze the synthesis of fucosylated prebiotics.

Key points

• Few strains of L. rhamnosus exhibited alfB on their chromosomes.

• Fucosidases from L. rhamnosus INIA P603 were characterized and stabilized.

• Although all the fucosidases hydrolyzed 2′-FL, only AlfB transfucosylated lactose.

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Data availability

Sequences of alfA, alfB, and alfC genes from Lacticaseibacillus rhamnosus INIA P603 were deposited in the GenBank under the following accession numbers as ON886905, ON886906, and ON886907, respectively. The authors declare that the data supporting the findings of this study are available within the article and its supplementary information files.

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Acknowledgements

The authors are very grateful to the Analysis Service Unit (USTA-ICTAN) for the chromatography analysis.

Funding

This research was funded by the Spanish Ministry of Science and Innovation grants PID2020-119630RB-I00 and RYC2019-026368-I.

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Contributions

JAC contributed to the study conception and design. Material preparation, data collection, and analysis were performed by AP, SL, EdV, and LB. The first draft of the manuscript was written by JAC, and JML commented on previous versions of the manuscript. All the authors read and approved the final manuscript.

Corresponding author

Correspondence to José Antonio Curiel.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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The authors declare no competing interests.

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Curiel, J.A., Peirotén, Á., Langa, S. et al. Characterization and stabilization of the α-L-fucosidase set from Lacticaseibacillus rhamnosus INIA P603. Appl Microbiol Biotechnol 106, 8067–8077 (2022). https://doi.org/10.1007/s00253-022-12262-w

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  • DOI: https://doi.org/10.1007/s00253-022-12262-w

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