BIO:more stable protein?

[joonkimdds]

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Which of the following refers to particularly stable arrangements of amino acid residues in a protein that give rise to recurring patterns?

a) Primary structure
b) Secondary structure
c) Tertiary structure
d) Quaternary structure
e) None of the above


I used to know this but I forgot 🙁
which protein is more stable?

 

[Isradoc1983]

hahah where do you come up with these questions ?
but thats a good one. I really don't know what to say. Logically if you denature a protein it denatures till the primary structure and the can refold again. so would it be a? primary structure?
idk i am not sure about it

 

[Danny289]

IMO Primary

 

[pbure9]

IMO Primary

yea, i think so too

 

[joonkimdds]

I read from my textbook
"proteins with the lowest free energy = most stable conformation = maximum number of weak interaction."

and the weak interaction it refers to is disulfide bonds, hydrogen bonds, and hydrophobic/ionic interactions.

Proteins always unfold and to counter unfolding, we use the above bonds.

If I follow this concept, I think the more bondings = more stable, so shouldn't it be quaterary?

 

[bigstix808]

Which of the following refers to particularly stable arrangements of amino acid residues in a protein that give rise to recurring patterns?

a) Primary structure
b) Secondary structure
c) Tertiary structure
d) Quaternary structure
e) None of the above


I used to know this but I forgot 🙁
which protein is more stable?

the answer to your question is 2ndary. alpha helix or beta sheets is what i believe the question to be referring to

 

[ldm0208]

the answer to your question is 2ndary. alpha helix or beta sheets is what i believe the question to be referring to

Agreed!​

 

[joonkimdds]

reason?

 

[bigstix808]

reason?

it is making reference to amino acid residues which has to do with the chemistry of the funtional groups. the primary structure has NOTHING to do with the chemistry of the functional groups, only the order of each amino acid. it can't be 3rd or 4th because those deal with more complex interactions between the groups (sulfide bridges, etc...) and generally do not have a "pattern" associated with them - alpha helix and beta sheets do.

clear as mud??

 

[ldm0208]

reason?

Which of the following refers to particularly stable arrangements of amino acid residues in a protein that give rise to recurring patterns?

secondary structures are the repeating structures by H-bonds. ie) alpha helix and beta sheet

Logically if you denature a protein it denatures till the primary structure and the can refold again. so would it be a? primary structure?

That's true! I still remember that from the destroyer. But that's not the concept that this question wants us to catch!

 

[doc3232]

Ya, the answer seems to be secondary.
Loads of Hydrogen bonds that are quite stable I think.

 

[joonkimdds]

does that mean this question is asking which one is recurring pattern? not which one is the most stable form of protein?

if so, I guess 2ndary is correct.

but which one is the most stable form of protein?

 

[bigstix808]

does that mean this question is asking which one is recurring pattern? not which one is the most stable form of protein?

if so, I guess 2ndary is correct.

but which one is the most stable form of protein?

well, this is where you can get technical from the term "most stable". while a tert and quart structure can be denatured (heat, pH, etc), the primary structure is still in tact which could lead one to believe that the primary is the most stable.

take a ball of yarn that you buy at the store. the ball could be your tert structure, but if your cat gets a hold of it and unwinds the whole thing. you still have that same strand of yarn (primary), but it is no longer in a nice pretty ball (the tert structure).

is that making sense?

 

[yakuza]

Which of the following refers to particularly stable arrangements of amino acid residues in a protein that give rise to recurring patterns?

a) Primary structure
b) Secondary structure
c) Tertiary structure
d) Quaternary structure
e) None of the above


I used to know this but I forgot 🙁
which protein is more stable?

I'm pretty sure its primary, denaturing occurs 4', then 3', then 2'. BUT 1' is the weirdest to break? I think acids in stomach only denatures 4+3+2 and NOT 1'..somethingg like that.

Pretty confident its 1' for DAT terms, unless some biochemist in here published an article no one read about how 1' is not the most stable.

 

[ldm0208]

I'm pretty sure its primary, denaturing occurs 4', then 3', then 2'. BUT 1' is the weirdest to break? I think acids in stomach only denatures 4+3+2 and NOT 1'..somethingg like that.

Pretty confident its 1' for DAT terms, unless some biochemist in here published an article no one read about how 1' is not the most stable.

man....

again, you are not wrong but you are not answering to what the question is asking for. please read posts above yours.

 

[joonkimdds]

I asked my bio professor today about this question and even she wasn't sure. LOL.

 

[hdu]

May I select "none of the above"?

Which is the source of this question?

the most appropriate answer, in my opinion, would be supersecondary structures. One of them is called "motif". The motif are stable recurrent patterns that appear in a protein, like a barrel structure, for example, that appears in some proteins.

(I believe that it is something that you do not need to know now, that is why I am asking about the original source of the question...)

my blog www.biochemistryquestions.wordpress.com

(Note: If I had to select one of those structures in the question, I would select the secondary structure, based on the alpha helix and the beta strands)

 

[keliao]

Secondary, at this stage beta sheets and alpha helices are being formed.... beta sheets (5-10aminoacids with peptide backbones almost fully extended) are helt together and bonded by hydrogen bonds making it more stable than primary, thus at primary its just linearly bonded.

at tertiary, these proteins starts to fold forming 3D structure, water are being excluded thus protein folding involve in covalent bonding in the formof disulfide bridges between cystein.

H-bond/ or covalent bond??

now your qestion is askng for RECURRING PATTERNS??

i am sitll kinda confused,,but,i would guess secondary.

 

[supraman]

I was thinking tertiary, which is alpha and beta sheets together (the patterns), but this question isn't too friendly worded