Abstract：
:The pectin methylesterase action is usually studied in a homogeneous aqueous medium in the presence of a large excess of soluble substrate and water. However in the cell wall, the water content is much lower, the substrate is cross-linked with itself or with other polymers, and the enzyme has to diffuse through the solid matrix before catalysing the linkage breakdown. As plant primary cell walls can be considered as cellulose-reinforced hydrogels, this study investigated the diffusion of a fungal pectin methylesterase in pectin/cellulose gels used as cell wall-mimicking matrix to understand the impact of this matrix and its (micro) structure on the enzyme's diffusion within it. The enzyme mobility was followed by synchrotron microscopy thanks to its auto-fluorescence after deep-UV excitation. Time-lapse imaging and quantification of intensity signal by image analysis revealed that the diffusion of the enzyme was impacted by at least two criteria: (i) only the active enzyme was able to diffuse, showing that the mobility was related to the catalytic ability, and (ii) the diffusion was improved by the presence of cellulose in the gel.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Bonnin E,Alvarado C,Crépeau MJ,Bouchet B,Garnier C,Jamme F,Devaux MFdoi
10.1038/s41598-019-49108-xsubject
Has Abstractpub_date
2019-08-29 00:00:00pages
12551issue
1issn
2045-2322pii
10.1038/s41598-019-49108-xjournal_volume
9pub_type
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