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Cellulose-Glycogen

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Cellulose-Glycogen

Postby hobaoau » Thu Jan 18, 2007 1:36 am

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? :roll:
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Postby sachin » Thu Jan 18, 2007 4:29 am

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.
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Postby Tan Tze Chein » Thu Jan 18, 2007 11:02 am

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.
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Postby MrMistery » Thu Jan 18, 2007 6:03 pm

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]
Last edited by MrMistery on Fri Jan 19, 2007 5:34 pm, edited 1 time in total.
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Postby sachin » Fri Jan 19, 2007 3:32 pm

MrMistery wrote: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..... :oops: Cellulase...
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Postby victor » Wed Jan 24, 2007 9:31 am

beta-(1->4)-cellulose hydrolase ?
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Postby MrMistery » Wed Jan 24, 2007 3:23 pm

maybe that is the full name. My book just says cellulase, it is a term that has become widely used..
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Postby sachin » Wed Jan 24, 2007 4:02 pm

1,4-a-glucosidase EC 3.2.1.4 cellulase

This may work........

EC 3.2.1.6 endo-1,3(4)-ß-glucanase
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Postby victor » Thu Jan 25, 2007 11:06 am

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...:lol:
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Postby micching1204 » Fri Jan 26, 2007 10:08 am

sachin wrote: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~

^^
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Postby victor » Fri Jan 26, 2007 11:15 am

sachin wrote: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.
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Postby micching1204 » Fri Jan 26, 2007 11:17 am

victor wrote:
sachin wrote: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?
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