Oxytocin concentration in Liquid Trust??

[xvs]

But as far as stability: Yes, high temps should be avoided, as the protiens in peptide-complexes (I.e.

oxytocin) often denature at higher temperatures..

...

To cause the tertiary structure

of (a protein) to unfold...

Oxytocin is not a protein. It is a peptide made of only 9 amino acids.



It has no tertiary structure.

[WorkingMann]

Oxytocin is not a

protein. It is a peptide made of only 9 amino acids.

It has no tertiary structure.

I think HEC meant

the proteins in the peptide..

But as far as stability: Yes, high temps should

be avoided, as the protiens in peptide-complexes (I.e. oxytocin) often denature at

higher temperatures..

[Mungojerry]

ddddddddddddddddddddddddddddddd

[jvkohl]

There are no

proteins in peptides.

Essentially, peptides are short molecules formed by linkage of amino acids. Protiens

are long molecules formed by linkage of amino acids.

Hence you don't have proteins in

peptides.

Gentlemen,
Having been acused on several occassions of getting "too technical," I

suspect we may be pressing the upper limits of technicalities here, but also wanted to add:

From Wikpedia:

(because even I had to check my assumptions)
"a peptide is an amino acid molecule without secondary structure; on

gaining defined structure, it is a protein." Thus the same molecule can be either a peptide or a protein depending

on its environment, though there are peptides that cannot be

proteins."

JVK

[xvs]

From Wikpedia: (because

even I had to check my assumptions)
"a peptide is an amino acid molecule without secondary structure; on gaining

defined structure, it is a protein." Thus the same molecule can be either a peptide or a protein depending on its

environment, though there are peptides that cannot be

proteins."

JVK

Don't trust Wikipedia too much. What we're

talking about here are polypeptides, not peptides. A peptide is a single amino acid residue (the amino acid as it is

once it's part of a chain), and a polypetide is two or more amino acids linked together.

Oxytocin is a

9-unit polypeptide.

All proteins are polypeptides, but the primary distinguishing factor between

polypeptides and proteins is whether they have tertiary structure, and this is determined mainly by the number of

peptides. The smallest human proteins which have been identified are about 45 peptides in length.

Proteins

have three structures:

- primary, which is the sequence of peptides (amino acids) in the chain.
-

secondary, which is the linkage between peptides in one part of the chain with peptides in the other part of the

chain (usually through the same hydrogen bonds that keep water liquid at room temperature).
- tertiary, which is

the complete structure of a protein, including all the folding (beta sheets, alpha helixes, etc.)

Oxytocin is

only 9 units long. This is too short to have ANY tertiary structure. So oxytocin is NOT a protein.

But it

does have a secondary structure, as can be seen in this paper:

secondary structure of part of

oxytocin. The dotted lines are hydrogen bonds.

[jvkohl]

Don't trust Wikipedia

too much. What we're talking about here are polypeptides, not peptides. A peptide is a single amino acid residue

(the amino acid as it is once it's part of a chain), and a polypetide is two or more amino acids linked together.



Oxytocin is a 9-unit polypeptide.

xvs,
Someday soon we should speak on the phone. I know

that Wikipedia is not the ultimate source, but it's a reasonably good source for info that's easier to understand

than most--especially textbooks.

My primary interest is in the decapeptide hormone: gonadotropin releasing

hormone, which oddly enough has a 9-unit version of its mammalian counterpart in yeast, which is non other that the

alpha mating pheromone of "brewer's" yeast. I think that hormones are considered proteins, but could be wrong--and

also that their receptors are proteins, but could be wrong. We may just be running into definitions that don't help

researchers communicate well across different disciplines. Also, a fraction of the GnRH decapeptide appears to

function directly as a neurotransmitter: a hormone? a protein?

JVK