enzymes 6

Question 1

where do we find pectin?

Answer 1

in the cell wall

Question 2

pectin consists of

Answer 2

1. smooth regions
2. hairy or branched regions

Question 3

pectin esterase

Answer 3

saponifies pectin with a high degree
of esterification
–> Methanol and pectin with lower degree of esterification are formed

Question 4

Polygalacturonase (PG)

Answer 4

glycoside hydrolase active on
pectic acid and pectin with low degree of esterification
–> Endo- and exopolygalacturonase

Question 5

pectate lyase (PAL)

Answer 5

cleaves glycosidic linkage of
pectin with a low degree of esterification or pectic acid
–> β-elimination, double bond is introduced

Question 6

pectin lyase (PL)

Answer 6

cleaves glycosidic linkage of pectin
with high degree of esterification

Question 7

application of pectinases

Answer 7

1. juice production
2. ripening veggies and fruit
3. upgrading agricultural residues