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Douglas Harper's Etymology Dictionary

peptide built from a large number of amino acids, 1903, from German polypeptid; see poly- + peptide.


n. 1 (context organic chemistry English) Any polymer of (same or different) amino acids joined via peptide bonds. 2 (context biochemistry English) Any such polymer that is not folded into a secondary structure of a protein. 3 (context protein English) A small protein containing up to 100 amino acids; see also oligopeptide.


n. a peptide containing 10 to more than 100 amino acids

Usage examples of "polypeptide".

The globin component consists of four polypeptide chains, which are designated alpha, beta, gamma, and so forth, according to their amino-acid makeup.

There was something wholly touching about these microspheres, these subcreatures of polypeptide origin.

A woman with abdominal scar tissue was the killer, and the Viscumin-Sarin polypeptide is missing.

All the other steps from polypeptide to vanished near-Nobelists can be derived.

I would show how stretches of the supercoiled chromosome are simple substitutions for polypeptide chains.

Molecular analysis of the stimulants revealed the presence of nothing more sinister than the expected polypeptide chains of amino acids.

The precise three-dimensional configurations are importantthe polypeptide chains have to fold up to form the properly shaped catalytic cavities.

Proteins are simply polypeptide chains or strings of amino acids joined together, and so the sequence of the amino acids, as well the nature of the R side-chains on the amino acids and whether the side-chains are polar, non-polar, etc.

Secretin and other hormones of similar nature are built up of amino acid chains containing more than a dozen and less than a hundred amino acids and are therefore sometimes called polypeptide hormones rather than protein hormones.

Having said that secretin is a polypeptide hormone, the next step, logically, would be to decide which amino acids are to be found in its molecule and how many of each.

The stimulus of acid is not, therefore, expected to bring about a complete formation of a polypeptide molecule, but only one small chemical reaction.

None of them have been as well studied as secretin, but all are believed to be polypeptide in nature.

If polypeptide hormones bring about the production of digestive juices, the compliment is, in a way, returned.

There are digestive juices that produce polypeptide hormones in the blood.

The small fragments are polypeptide hormones capable of stimulating the contraction of smooth muscle under some conditions and its relaxation under other conditions.