Cellulose-Glycogen

[hobaoau]

Cllulose and glycogen are different in physical properties and biological functions but they are both polysaccharides which are made of glucose monomer. But Why they have such the differences?

[sachin]

Glycogen is chemicaly composed of.... glucose molecules in long chains joint by "alpha 1-4 Glycosiic bond" and it has side chains held by "alpha 1-6 Glycosidic bond"....

Cellulose on other hand is composed of Long chain of beta-D-Glucose Units linked by "beta-1-4 Glycosidic bonds"; It has no banches....And can not be digested in mammalian stomach...without simbiotic bacteria which secreate alpha-Amylase.

[Tan Tze Chein]

Sachin said is right, but I am going to explain futher. The beta-glucose in the cellulose are arranged in a flip-flop manner in the long chain of cellulose. This strengthen the glycosidic bonds between the beta-glucose. Futhermore, the long chain of glucose will form strong hydrogen bonds with the adjacent chain to strengthen the structure of cellulose. This is because cellulose is the structural component of call wall in the plants.

[MrMistery]

sorry sachin but no. all amylases break down the alpha-1,4 glycosidic bonds, be they alpha-amylase, beta-amylase etc.

The enzyme that breaks down cellulose is (very hard name to remember) cellulase...
[Edited by me cause a spelling mistake made the post sound stupid]

[sachin]

sorry sachin but no. all amylases break down the alpha-1,4 glycosidic bonds, be they alpha-amylase, beta-amylase etc.

The enzyme that breaks down cellulase is (very hard name to remember) cellulase...

I was not known..... Cellulase...

[victor]

beta-(1->4)-cellulose hydrolase ?

[MrMistery]

maybe that is the full name. My book just says cellulase, it is a term that has become widely used..

[sachin]

1,4-a-glucosidase EC 3.2.1.4 cellulase

This may work........

EC 3.2.1.6 endo-1,3(4)-ß-glucanase

[victor]

Oh man....those numbers again, again and again.....I hope I'll like it when I learn about it in my enzymology class next semester which is about to begin...

[micching1204]

Glycogen is chemicaly composed of.... glucose molecules in long chains joint by "alpha 1-4 Glycosiic bond" and it has side chains held by "alpha 1-6 Glycosidic bond"....

Cellulose on other hand is composed of Long chain of beta-D-Glucose Units linked by "beta-1-4 Glycosidic bonds"; It has no banches....And can not be digested in mammalian stomach...without simbiotic bacteria which secreate alpha-Amylase.

good explaination~
i've juz learnt bout tis in my lecture today~

^^

[victor]

Glycogen is chemicaly composed of.... glucose molecules in long chains joint by "alpha 1-4 Glycosiic bond" and it has side chains held by "alpha 1-6 Glycosidic bond"....

Cellulose on other hand is composed of Long chain of beta-D-Glucose Units linked by "beta-1-4 Glycosidic bonds"; It has no banches....And can not be digested in mammalian stomach...without simbiotic bacteria which secreate alpha-Amylase.

I think I've heard that my professor said that alpha amylase is used to cut down the glucosan in random area, but it's spesific only to alpha 1->4, not beta 1->4.

[micching1204]

Glycogen is chemicaly composed of.... glucose molecules in long chains joint by "alpha 1-4 Glycosiic bond" and it has side chains held by "alpha 1-6 Glycosidic bond"....

Cellulose on other hand is composed of Long chain of beta-D-Glucose Units linked by "beta-1-4 Glycosidic bonds"; It has no banches....And can not be digested in mammalian stomach...without simbiotic bacteria which secreate alpha-Amylase.

I think I've heard that my professor said that alpha amylase is used to cut down the glucosan in random area, but it's spesific only to alpha 1->4, not beta 1->4.

amylase oso separate into alpha n beta?