Pectinesterase (EC 18.104.22.168) (pectin methylesterase) catalyzes the hydrolysis
of pectin into pectate and methanol. In plants, it plays an important role in
cell wall metabolism during fruit ripening, cell wall extension and during
pollen germination. In plant bacterial pathogens such as Erwinia carotovora
and in fungal pathogens such as Aspergillus niger, pectinesterase is involved
in maceration and soft-rotting of plant tissue.
Prokaryotic and eukaryotic pectinesterases share a few regions of sequence
similarity [1,2,3]. We selected two of these regions as signature patterns.
The first is based on a region in the N-terminal section of these enzymes; it
contains a conserved tyrosine which may play a role in the catalytic mechanism
. The second pattern corresponds to the conserved sequence around an active
site aspartate , an octapeptide located in the central part of these
June 2002 / Text revised.
PROSITE methods (with tools and information) covered by this documentation:
Ray J., Knapp J., Grierson D., Bird C., Schuch W.
Identification and sequence determination of a cDNA clone for tomato pectin esterase.
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