Talk:Peptide

Beauty products?

Every advert at the moment claims that pentapeptides can make their produce "reduce the signs of aging"... I came to this article to find out if this was true, but no luck. Possibly a section needed to address this as this term has become a household term recently. —Preceding unsigned comment added by Giant toaster (talk • contribs) 07:44, 29 June 2008 (UTC)

Doesn't seem either probable or important to me. Tim Vickers (talk) 15:50, 29 June 2008 (UTC)

Attributing some property to a peptide on the grounds that it is a pentapeptide (ie, consists of 5 amino acids) is like saying a molecule with 5 carbon atoms will have a specific property; ie nonsensical. —Preceding unsigned comment added by 121.79.24.62 (talk) 02:42, 8 August 2008 (UTC)

This is true, but the fact is that Olay - at least in the UK - is making such claims relating to pentapeptides. As Giant Toaster says, the term has become far more widely known as a result. Nick Cooper (talk) 07:51, 16 August 2008 (UTC)

Peptides vs. Proteins:

Q: What is the difference between a peptide and a protein? :S Brutulf 16:34, Apr 4, 2005 (UTC)

A: Peptides are less than 50 amino acids long and they do not have secondary and tertiary structures. Therefore they can fold into a variety of shapes. e.g. Insulin. Proteins, however, have more than 50 amino acids. They have secondary and tertiary structures, and therefore most proteins have fixed shapes. e.g. Hemoglobin.

• See Also: Grand Peptide List The Biochemical Basis of Neuropharmacology Oxford Press 1996--McDogm 16:42, 6 May 2005 (UTC)

Q: I disagree - my teacher says that peptides are simply chains of proteins.

A: Peptides and proteins are both chains of amino acids. However proteins are longer chains. This is probably what your teacher was referring to. Archie 11:46, 8 April 2006 (UTC)

Q: I'm doing a PhD thesis on membrane-peptide interactions. I believe the following is not true (cited from wikipedia article): Because of the arbitrary nature of this definition, there is considerable movement within the scientific community to ascribe the more-specific definition that "a peptide is an amino acid molecule without secondary structure; on gaining defined structure, it is a protein." Suggestion: delete it.

External Peptide Links

• Peptide Information, bioinformatics, protocols, and lists of services. Bioinformin

This section needs references

I can't find any reliable references about dermorphin, casomorphin or gluten exorphin contributing to mental illness in PubMed. Tim Vickers 03:21, 17 October 2007 (UTC)

Digested peptides

Are the result of nonspecific proteolysis as part of the digestive cycle. It has also been documented that, when certain food proteins such as gluten, casein, egg protein, and spinach protein are broken down, opioid peptides are formed. These peptides mimic the effects of morphine, and those individuals that are unable to break them down will experience mental illness. These peptides are quite short and are given names such as casomorphin, gluten exorphin, and dermorphin. Ultimately digested peptides are ribosomal peptides, although they aren't made on the ribosome of the organism that contains them.