glucose - glycolisis

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victor
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Post by victor » Mon Jul 11, 2005 11:34 am

You mean that when entering glycolysis fructose is directly changed into fructose-6-phosphate??(directly to the 3rd substrate of glycolysis?)

Wow...spermatozoa likes a sweeter things... :lol: ..fructose is 1.7x sucrose while glucose is only 0.67x sucrose.. :lol:
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Dr.Stein
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Post by Dr.Stein » Wed Jul 13, 2005 9:32 am

This is the steps of glycolisis in spermatozoa (also called as fructolysis):

1. fructose ---> fructose-1-phospate by kinase
2. fructose-1-phospate ---> fructose-1,6-diphospate by kinase
3.fructose-1,6-diphospate ---> 2 triosephosphates (3-phospho-glycerine aldehyde & dihydroxyacetone phosphate) by aldolase
4. 3-phospho-glyceraldehyde ---> 1,3-diphosphoglycerine by replacing H+, reaction with anorganic phosphate, dehydrogenase, diphosphopyridine nucleotid/DPN-DPNH2 ---> 1,3-diphosphoglycerat
5. 1,3-diphosphoglycerat ---> 3-phosphoglycerat by phosphatase
6. 3-phosphoglycerat ---> 2-phosphoglycerat by mutase (phosphoglyceromutase)
7. 2-phosphoglycerat ---> phosphoenolpyruvat by enolasem transphosphorylase
8. phosphoenolpyruvat ---> pyruvat by phosphatase
9. pyruvat ---> lactat (DPNH2-DPN)

It is stated that spermatozoa prefer to undergo fructolysis in aerobic pathway (using lactat).
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xenthe
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chain

Post by xenthe » Sat Jun 17, 2006 3:04 am

what's the meaning by beta-chain and alfa-chain ?What's the different between them?

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victor
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Post by victor » Sat Jun 17, 2006 7:01 am

First, see the differences between thw 2 structures of Maltose and cellobiose. You'll see that both of them have nearly the same structure (because they come from the same monomer: glucose). The differencec is that Maltose has an alpha glycosidic bond in the C-1 and C-4. While cellobiose has the beta glycosidic bond..
confused? same with me then..:lol: ok, to make it clear, I'll post their photo.
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close up together and say cheeeese...:lol:
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teyya
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Post by teyya » Fri Aug 21, 2009 9:28 am

hi all.i need to ask some questions...because it was asked by my lecture...in glycolysis process,why glucose cannot be phosphorylated two times and directly converted to glucose-1,6 biphosphate instead of fructose 1,6 biphoshpate..and secondly, can galactose be transformed to fructose? i need ur help......

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