simple qs

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sarah90222
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simple qs

Post by sarah90222 » Sat Nov 14, 2009 2:14 pm

i had this exam qs:

in secondary structures of proteins what bonding occurs between charged side chains which is weak in water? This bond is non-covalent

i put electrostatic attractions because i thought hydrogen bonds cant be present between charged side chains and is only present between polar molecules. but then again in secondary structures the only types of bonding present are hydrogen and wan der waals.

whats the right answer

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JackBean
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Post by JackBean » Sun Nov 15, 2009 1:08 am

sure electrostatic. If there meet for example Asp and Lys, they will make bond in between ;)
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jwalin
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Post by jwalin » Sun Nov 15, 2009 4:23 am

i think hydrogen bonding is a better answer
it isn't what you do that matters but it is how you do it

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JackBean
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Post by JackBean » Sun Nov 15, 2009 1:47 pm

No, it's not. In the case of charged molecules, there is no hydrogen bonding.
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kolean
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Post by kolean » Sun Nov 15, 2009 3:14 pm

I thought electrostatic bonding was only when ions are involved (like Mg2+, Ca2+, or any of the Fe+,++, +++). I would say hydrogen bonding, because amino acids that are charged still contain only N, O, S, and these love H.
I would actually say the van der Waals, since it said was weak in water. Aren't van der Waals forces weaker than the hydrogen bonding of water molecules (clathrin coat for example is very strong).

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jwalin
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Post by jwalin » Mon Nov 16, 2009 3:17 am

sorry i didn't read the question well.
do not know the answer anyways.
vanderwaal could be right.
it isn't what you do that matters but it is how you do it

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JackBean
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Re:

Post by JackBean » Mon Nov 16, 2009 6:02 am

kolean wrote:I thought electrostatic bonding was only when ions are involved (like Mg2+, Ca2+, or any of the Fe+,++, +++). I would say hydrogen bonding, because amino acids that are charged still contain only N, O, S, and these love H.
I would actually say the van der Waals, since it said was weak in water. Aren't van der Waals forces weaker than the hydrogen bonding of water molecules (clathrin coat for example is very strong).

They can love hydrogen as much as they can, but it will still be bond between two charges, not H-bridge B...H-A
Anyway, I was now looking to internet and it seems, that all non-covalent bondings are actually van der Waals, so it doesn't matter so much anyway...
http://www.biolib.cz/en/main/

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