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α-Mannosidase and β-d-N-acetylhexosaminidase outside the wall: partner exoglycosidases involved in fruit ripening process

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Abstract

Cell wall is a strong and complex net whose function is to provide turgor, pathogens attack protection and to give structural support to the cell. In growing and expanding cells, the cell wall of fruits is changing in space and time, because they are changing according to stage of ripening. Understand which mechanisms to produce significant could help to develop tools to prolong the fruit shelf life. Cell wall proteins (CWPs) with enzymatic activity on cell wall polysaccharides, have been studied widely. Another investigations take place in the study of N-glycosylations of CWPs and enzymes with activity on glycosidic linkages. α-mannosidase (α-Man; EC 3.2.1.24) and β-d-N-acetylhexosaminidase (β-Hex; EC 3.2.1.52), are enzymes with activity on mannose and N-acetylglucosamine sugar presents in proteins as part of N-glycosylations. Experimental evidence indicate that both are closely related to loss of fruit firmness, but in the literature, there is still no review of both enzymes involved fruit ripening. This review provides a complete state-of-the-art of α-Man and β-Hex enzymes related in fruit ripening. Also, we propose a vesicular α-Man (EC 3.2.1.24) name to α-Man involved in N-deglycosylations of CWPs of plants.

Key message

Cell wall proteins (CWPs) with enzymatic activity on cell wall polysaccharides, have been studied widely. Another investigations take place in the study of N-glycosylations of CWPs and enzymes with activity on glycosidic linkages. Lysosomal α-mannosidase (α-Man; EC 3.2.1.24) and β-d-N-acetylhexosaminidase (β-Hex; EC 3.2.1.52), are enzymes with activity on mannose and N-acetylglucosamine sugar presents in proteins as part of N-glycosylations. Experimental evidence indicate that both are closely related to loss of fruit firmness, but in the literature, there is still no review of both enzymes involved fruit ripening. This review provides a complete view of lysosomal α-Man and β-Hex enzymes related in fruit ripening.

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Funding

This work was supported by Agencia Nacional de Investigación y Desarrollo de Chile [FONDECYT PostDoctoral #3220284 to A.M-Y.; REDES #190093 to L.M-Q and A.M-Y; ANILLO #ATE220014 to L.M-Q].

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LMQ and AMY writing—original draft preparation, LMQ and AMY writing—review and editing the final version. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Luis Morales-Quintana or Angela Méndez-Yáñez.

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Morales-Quintana, L., Méndez-Yáñez, A. α-Mannosidase and β-d-N-acetylhexosaminidase outside the wall: partner exoglycosidases involved in fruit ripening process. Plant Mol Biol 112, 107–117 (2023). https://doi.org/10.1007/s11103-023-01356-2

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  • DOI: https://doi.org/10.1007/s11103-023-01356-2

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