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View Full Version : Interactions which hold the polypeptide chain together urgent help pleas


Spud93
Feb 12, 2011, 10:50 AM
This is an enzyme protein showing two of the interactions which hold the polypeptide chain together to give its characteristic higher-order structure.Give the full correct name of the interaction.
Enzyme in atachments

cakeg
Feb 13, 2011, 04:57 AM
Hydrophobic interaction & hydrogen bond for the last interaction. All weak interactions

phill_o
Feb 13, 2011, 06:53 AM
Actually I think the top one is ionic interaction and the bottom, hydrophobic interaction

Unknown008
Feb 13, 2011, 09:30 AM
Nope, those two answers are wrong...

Where you see a hydrogen atom covalently bonded to either N, O or F, you have to look out for any possible hydrogen bonding. The hydrogen atom acquires a partial positive charge and will form a hydrogen bond with an atom with a partial negative charge, including N, O or F.

Now, when you see charges being clearly shown, that means there is an ionic bond somewhere.

Well, if with those you can't get the answer, I don't know how to help you without giving those very obvious hints. :)

DrBob1
Feb 13, 2011, 09:42 AM
The top interaction: -O-H...NH2R is a HYDROGEN BOND (a classic one)
The lower interaction: -COO- ... +H3N- is an IONIC ATTRACTION (isn't it obvious?)
Hydrophobic interactions are hydrocarbon groupa (aliphatic or aromatic) with each other.