In the apoplasm, pectins are de-methylesterified by pectin methyl esterases (PMEs), which modulate the degree and patterns of methylesterification [ 20].
Previous in vitro studies have revealed that At4g32460- and At5g11420-encoded proteins interact with the catalytic domain of pectin methyl esterase 3 (AtPME3, which is encoded by At3g14310).
Besides, we also identified xylan esterases (CE 1, 4, 6 and 7) and pectin methyl esterase (CE8), which acts on side chains of hemicellulose and pectin, respectively, and render both the large molecules accessible for further breakdown.
The secreted esterase class contains five major subclasses (glutactin, juvenile hormone (JH) esterases, JHEs-like enzymes, β -esterases and semiochemical esterases), and the ODEs are members of the semiochemical esterases, which are potentially involved in the degradation of pheromone compounds and plant volatiles [ 32].
Esterases, which belong to the group of carboxylester hydrolases, hydrolyze such linkages.
COEs are mainly attributed to B esterases, which were essentially irreversibly inhibited by organophosphate insecticides (OPs).
Genes encoding cell wall-modifying enzymes such as xyloglucan endotransglycosylase (XTH) and pectin methyl esterases were modulated in infested plants against phloem feeding insects (Moran et al. 2002).
Control and hyperhydric micropropagated plantlets from three carnation cultivars have been used to study their pectin composition and the activity of pectin methyl esterases (PMEs; EC 3.1.1.11).
Hence, callose synthases, pectin methyl esterases, eIF4A, acid phosphatases, HSP70 were also identified (Table 2).
These four fungi have 5, 6, 6 and 5 pectin methyl esterases (PME, CE8) respectively.
