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Multifaceted roles of plant glycosyl hydrolases during pathogen infections: more to discover

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Abstract

Main conclusion

Carbohydrates are hydrolyzed by a family of carbohydrate-active enzymes (CAZymes) called glycosidases or glycosyl hydrolases. Here, we have summarized the roles of various plant defense glycosidases that possess different substrate specificities. We have also highlighted the open questions in this research field.

Abstract

Glycosidases or glycosyl hydrolases (GHs) are a family of carbohydrate-active enzymes (CAZymes) that hydrolyze glycosidic bonds in carbohydrates and glycoconjugates. Compared to those of all other sequenced organisms, plant genomes contain a remarkable diversity of glycosidases. Plant glycosidases exhibit activities on various substrates and have been shown to play important roles during pathogen infections. Plant glycosidases from different GH families have been shown to act upon pathogen components, host cell walls, host apoplastic sugars, host secondary metabolites, and host N-glycans to mediate immunity against invading pathogens. We could classify the activities of these plant defense GHs under eleven different mechanisms through which they operate during pathogen infections. Here, we have provided comprehensive information on the catalytic activities, GH family classification, subcellular localization, domain structure, functional roles, and microbial strategies to regulate the activities of defense-related plant GHs. We have also emphasized the research gaps and potential investigations needed to advance this topic of research.

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The data in the review article are available from the corresponding author upon request.

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Acknowledgements

The authors thank the Science and Engineering Research Board (SERB) India for the SRG grant (SRG/2022/000528) and the Birla Institute of Technology and Science—Pilani, Pilani (BITS Pilani) campus for the ACRG grant to Balakumaran Chandrasekar. Muthusaravanan Sivaramakrishnan and Chetan Veeraganti Naveen Prakash are supported by the Institute Fellowship from Birla Institute of Technology and Science, Pilani (BITS Pilani), India. The authors would like to thank Ms. Sakshi Goel for contributing to initial literature searches and discussions.

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BC helped in idea and conceptualization and performed supervision, project administration, funding acquisition, and writing—original draft preparation; MS, CVNP, and BC were involved in literature review and writing—review and editing. CVNP and BC prepared table; MS and BC prepared figures. MS performed bioinformatic analysis.

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Correspondence to Balakumaran Chandrasekar.

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The authors declare no conflict of interest.

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Communicated by Gerhard Leubner.

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Sivaramakrishnan, M., Veeraganti Naveen Prakash, C. & Chandrasekar, B. Multifaceted roles of plant glycosyl hydrolases during pathogen infections: more to discover. Planta 259, 113 (2024). https://doi.org/10.1007/s00425-024-04391-5

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