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Encyclopedia > Polypeptide

Peptides are the family of molecules formed from the linking, in a defined order, of various amino acids. The link between one amino acid residue and the next is an amide bond, and is sometimes referred to as a peptide bond. An amide bond is somewhat shorter than a typical carbon-nitrogen single bond, and has a partial double-bond character, because the participating carbon molecule is doubly bonded to an oxygen molecule and the nitrogen has a lone pair of electrons available for bonding.

Peptides (like proteins) occur in nature and are responsible for a wide array of functions, many of which are not yet understood. Antimicrobial peptides generally disrupt the membranes of a target cell, causing lysis of the cell. How this occurs, and what determines the activity and selectivity of these peptides, is currently only known approximately.

Peptides differ from proteins, which are also long chains of amino acids, by virtue of their size. Traditionally, those peptide chains that are short enough to make synthetically from the constituent amino acids are called peptides rather than proteins. The dividing line is at approximately 50 amino acids in length, since naturally-occurring proteins tend, at their smallest, to be hundreds of residues long. So, in essence, a peptide is a small protein.

Peptidomimetics (such as peptoids and β-peptides) are molecules related to peptides, but with different properties.

Notes on terminology

See also

External links

  • Antimicrobial Peptides (http://moose.bio.ucalgary.ca/Research/Current%20Projects/Antimicrobial%20Peptides/)

  Results from FactBites:
Peptide - Wikipedia, the free encyclopedia (627 words)
A polypeptide is a single linear chain of amino acids.
A protein is one or more polypeptides more than about 50 amino acids long.
An oligopeptide or (simply) a peptide is a polypeptide less than 30-50 amino acids long.
Patent 6,538,123 (3522 words)
Preferably, a portion of the C polypeptide of HCV responsible for thr regulatory activity may be a portion of the C polypeptide ranging from the amino acid at position 1 to the amino acid in one of positions 48 to 191.
A portion of the E1 polypeptide of HCV responsible for the interaction of the C polypeptide with the E1 protein may be in particular the C-terminal domain of the E1 polypeptide, preferably the domain at positions 330 to 380 or at positions 370 to 380.
A polypeptide, a mixture or a molecule of DNA useful for the purposes of the present invention may be formulated in or with liposomes, preferably neutral or anionic liposomes, microspheres ISCOMs or virus-like particles (VLPs), in order to promote the screening of the protein or of the polypeptide or to increase the immune response.
  More results at FactBites »



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