The Student Room Group

What do Protease, Lipase and Amylase have in common?

Apart from the fact that they're all enzymes that can either be broken down or absorbed
(edited 2 years ago)
Reply 1
Original post by alyxcts
Apart from the fact that they're all enzymes that can either be broken down or absorbed

Maybe talk about their structure?
What do enzymes have in common in terms of structure
You could also talk about their mode of action
Original post by alyxcts
Apart from the fact that they're all enzymes that can either be broken down or absorbed

@Kim J is talking sense!

You can mention active sites + the fact that all 3 are present in the digestive tract, so decompose complex food molecules into smaller substances that could be absorbed into the bloodstream + specifically all 3 in pancreatic juice secreted into the duodenum via the sphincter of Oddi [trypsin + chymotrypsin in the case of proteases].
Reply 3
Original post by macpatgh-Sheldon
@Kim J is talking sense!

You can mention active sites + the fact that all 3 are present in the digestive tract, so decompose complex food molecules into smaller substances that could be absorbed into the bloodstream + specifically all 3 in pancreatic juice secreted into the duodenum via the sphincter of Oddi [trypsin + chymotrypsin in the case of proteases].

would like also apply to trypsin, protease and amylase?
Original post by alyxcts
would like also apply to trypsin, protease and amylase?

Good morning young man [you are probs in deep slumber - only Sheldon gets up at 5 am even on Sunday lol :colondollar:],

Firstly, thank you for the rep!

I am not entirely sure what you are asking here [trypsin IS A protease, an endopeptidase to be precise], but here's some info that might help you to to get A*:-

1. Trypsin breaks peptide bonds adjacent to arginine and lysine [pepsin from gastric juice next to aromatic amino acids [= with a benzene ring - do you do chemistry, too? - here tyrosine and phenylalanine]]
2. The evolution of digestion is ingenious - the sequence in which proteases [e.g.] appear as we traverse the alimentary tract is highly rational. If we wanted to break up a necklace of beads into its constituent beads, would it be more efficient to break a bead at a time from the ends OR to break it into smaller parts first, then break ends?? Go on yes, well done! - oc the second option cos you will have more ends to work with, yeah?

OK now taking protein, the enzymes earlier in the GI tract are endopeptidases [pepsin, trypsin, [see [1.] above] etc in stomach + duodenum] to break the chain of a.a.-s into smaller ones [Greek], then exopeptidases [exo] [e.g. aminopeptidase in ileum to break off a.a.-s from -NH2 end of multiple smaller chains generated by endopeptidases as above]] - how very clever!!

3. Check out carbs digestion yourself for similar genius of nature.

[enjoy your sausage egg + bacon :colondollar:- I made mine 3 hours ago!]

M.
(edited 2 years ago)

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