Do de-N-glycosylation enzymes have an important role in plant cells?

Developmentally Regulated Expression of a Peptide:N-Glycanase during Germination of Rice Seeds (Oryza sativa) and Its Purification and Characterization

“…All these arguments appear to concur that PNGase has yet undefined physiological role in plant and animal cells and to confirm our previous proposal that the N-glycosylation/de-Nglycosylation system should occur more commonly than presently recognized in living organisms (28,38,39). Possible involvement of PNGase in the processes that initiate and control the metabolic activities of plant and animal development by free oligosaccharides liberated from glycoproteins has been substantiated by their accumulation, although the underlying molecular mechanisms are in most cases unknown.…”

Developmentally Regulated Expression of a Peptide:N-Glycanase during Germination of Rice Seeds (Oryza sativa) and Its Purification and Characterization

“…All these arguments appear to concur that PNGase has yet undefined physiological role in plant and animal cells and to confirm our previous proposal that the N-glycosylation/de-Nglycosylation system should occur more commonly than presently recognized in living organisms (28,38,39). Possible involvement of PNGase in the processes that initiate and control the metabolic activities of plant and animal development by free oligosaccharides liberated from glycoproteins has been substantiated by their accumulation, although the underlying molecular mechanisms are in most cases unknown.…”

Solubility–insolubility interconversion of sophoragrin, a mannose/glucose-specific lectin in Sophora japonica (Japanese pagoda tree) bark, regulated by the sugar-specific interaction

“…One possible mechanism by which clumps are thought to be dissociated is the up-regulation of the sugar concentration by sugar influx as a result of increased photosynthesis ( Figure 6C); the other is digestion of lectins by glycoamidases or glycosidases that can remove the receptor glycans. Free N-glycans released by glycoamidase may simultaneously act as signal molecules, such as growth factors in flax plantlets [28]. In this manner, the hypothesis of glycoprotein sequestration and administration via a self-aggregatable lectin agrees with the localization of lectins and seasonal changes of the concentration in bark tissue of perennial legumes, leading to efficient mobilization of nitrogen sources.…”

Natural Synchronisation for the Study of Cell Division in the Green Unicellular Alga Ostreococcus tauri

“…As in plants, this gene shows both a constant expression throughout the cell cycle and a regulation of its kinase activity (Hemerly et al, 1995;Sorrell et al, 2001;. The possibility of post-translational modification of OtCDKA by sumoylation, or other polypeptide tag linkage can be hypothesised to explain the doublet in western analysis (Novatchkova et al, 2004;Downes and Vierstra, 2005) although sulphation and glycosylation can not be excluded (Berger et al, 1995;Lerouge et al, 1998;Wilson, 2002). B-type CDKs are specific to plants and a CDKB ortholog is present in O. tauri.…”

Developmentally Regulated Expression of a Peptide:N-Glycanase during Germination of Rice Seeds (Oryza sativa) and Its Purification and Characterization

“…All these arguments appear to concur that PNGase has yet undefined physiological role in plant and animal cells and to confirm our previous proposal that the N-glycosylation/de-Nglycosylation system should occur more commonly than presently recognized in living organisms (28,38,39). Possible involvement of PNGase in the processes that initiate and control the metabolic activities of plant and animal development by free oligosaccharides liberated from glycoproteins has been substantiated by their accumulation, although the underlying molecular mechanisms are in most cases unknown.…”

Solubility–insolubility interconversion of sophoragrin, a mannose/glucose-specific lectin in Sophora japonica (Japanese pagoda tree) bark, regulated by the sugar-specific interaction

“…One possible mechanism by which clumps are thought to be dissociated is the up-regulation of the sugar concentration by sugar influx as a result of increased photosynthesis ( Figure 6C); the other is digestion of lectins by glycoamidases or glycosidases that can remove the receptor glycans. Free N-glycans released by glycoamidase may simultaneously act as signal molecules, such as growth factors in flax plantlets [28]. In this manner, the hypothesis of glycoprotein sequestration and administration via a self-aggregatable lectin agrees with the localization of lectins and seasonal changes of the concentration in bark tissue of perennial legumes, leading to efficient mobilization of nitrogen sources.…”

Natural Synchronisation for the Study of Cell Division in the Green Unicellular Alga Ostreococcus tauri

“…As in plants, this gene shows both a constant expression throughout the cell cycle and a regulation of its kinase activity (Hemerly et al, 1995;Sorrell et al, 2001;. The possibility of post-translational modification of OtCDKA by sumoylation, or other polypeptide tag linkage can be hypothesised to explain the doublet in western analysis (Novatchkova et al, 2004;Downes and Vierstra, 2005) although sulphation and glycosylation can not be excluded (Berger et al, 1995;Lerouge et al, 1998;Wilson, 2002). B-type CDKs are specific to plants and a CDKB ortholog is present in O. tauri.…”

Developmentally Regulated Expression of a Peptide:N-Glycanase during Germination of Rice Seeds (Oryza sativa) and Its Purification and Characterization

“…All these arguments appear to concur that PNGase has yet undefined physiological role in plant and animal cells and to confirm our previous proposal that the N-glycosylation/de-Nglycosylation system should occur more commonly than presently recognized in living organisms (28,38,39). Possible involvement of PNGase in the processes that initiate and control the metabolic activities of plant and animal development by free oligosaccharides liberated from glycoproteins has been substantiated by their accumulation, although the underlying molecular mechanisms are in most cases unknown.…”

Solubility–insolubility interconversion of sophoragrin, a mannose/glucose-specific lectin in Sophora japonica (Japanese pagoda tree) bark, regulated by the sugar-specific interaction

“…One possible mechanism by which clumps are thought to be dissociated is the up-regulation of the sugar concentration by sugar influx as a result of increased photosynthesis ( Figure 6C); the other is digestion of lectins by glycoamidases or glycosidases that can remove the receptor glycans. Free N-glycans released by glycoamidase may simultaneously act as signal molecules, such as growth factors in flax plantlets [28]. In this manner, the hypothesis of glycoprotein sequestration and administration via a self-aggregatable lectin agrees with the localization of lectins and seasonal changes of the concentration in bark tissue of perennial legumes, leading to efficient mobilization of nitrogen sources.…”

Natural Synchronisation for the Study of Cell Division in the Green Unicellular Alga Ostreococcus tauri

“…As in plants, this gene shows both a constant expression throughout the cell cycle and a regulation of its kinase activity (Hemerly et al, 1995;Sorrell et al, 2001;. The possibility of post-translational modification of OtCDKA by sumoylation, or other polypeptide tag linkage can be hypothesised to explain the doublet in western analysis (Novatchkova et al, 2004;Downes and Vierstra, 2005) although sulphation and glycosylation can not be excluded (Berger et al, 1995;Lerouge et al, 1998;Wilson, 2002). B-type CDKs are specific to plants and a CDKB ortholog is present in O. tauri.…”