Polypeptide

Polypeptides are chains of amino acids. Proteins are made up of one or more polypeptide molecules.
The amino acids are linked covalently by peptide bonds. The image shows how three amino acids linked by peptide bonds into a tripeptide.
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polypeptide
a molecule consisting of many joined amino acids, but not as complex as a protein
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
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Over the last few years, it has been clearly established that normal plasma contains low levels of oxidized polypeptides, and that these accumulate in tissues during several age-related pathologies.
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Polypeptide
A long chain of amino acids joined by peptide bonds. Cf. peptide.
Related Terms: Amino acid ...
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Polypeptide A protein or part of a protein made of a chain of amino acids joined by a peptide bond.
Population genetics The study of variation in genes among a group of individuals.
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Polypeptide: A molecule made up of a stri ng of amino acids. A protein is an example of a polypeptide.
Proteins: The active molecules in all cells. Proteins control biochemical reactions and determine the physical structure of organisms.
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Polypeptides
Bacitracin
Eye, ear or bladder infections; usually applied directly to the eye or inhaled into the lungs; rarely given by injection ...
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Polypeptides (neuropeptides):
Bombesin/GRP:
bombesin
gastrin releasing peptide (GRP) ...
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Polypeptides
Two or more amino acids bonded together are called a peptide. A chain of many amino acids is referred to as a polypeptide. The complete product, either one or more chains of amino acids, is called a protein.
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polypeptide
(pol-ee-pep-tide) [Gk. polus, many + pepto, to soften, digest]
A polymer (chain) of many amino acids linked together by peptide bonds.
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POLYPEPTIDE - See PEPTIDE.
pre-mRNA - An RNA molecule which is transcribed from chromosomal DNA in the nucleus of eukaryotic cells, ...
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Polypeptide (protein). A polymer composed of multiple amino acid units linked by peptide bonds.
Polyploid. A multiple of the haploid chromosome number that results from chromosome replication without nuclear division.
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polypeptide A molecule consisting of many joined amino acids, not as complex as a protein.
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Polypeptide: See Peptide.
Polyprotein: A giant polypeptide that contains multiple individual protein sequences embedded within it and which must be proteolytically cleaved to yield the individual proteins.
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Polypeptide a chain of amino acids bonded together
(poly = many; pepti = digested cooked)
Polypetalous term used to refer to a plant with un-united flower parts attached to the receptacle
(poly = many; petal = a leaf spread out flat) ...
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A polypeptide secreted by bacteria which inhibit or prevent the growth of related bacteria which lack the corresponding colicin immunity proteins. Colicins are encoded by a group of naturally occurring plasmids first found in E. coli (e.g.
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Some intein polypeptides are site-specific endonucleases as well as protein splicing catalysts. Endonuclease action results in insertion of the intein nucleic acid in a target site.
Facts ...
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"one gene one polypeptide hypothesis" A revision of the one gene, one enzyme hypothesis.
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A DNA sequence that codes for a specific polypeptide; a gene. See DNA, Gene. Clone. An exact genetic replica of a specific gene or an entire organism. See Cloning. Cloning.
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in the transcript of a gene and survives processing of the RNA in the cell nucleus to become part of a spliced messenger of a structural RNA in the cell cytoplasm; an exon specifies the amino acid sequence of a portion of the complete polypeptide.
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pleated sheet The side-by-side, hydrogen-bonded arrangement of polypeptide chains in the extended conformation. pleo- more than usual polar Molecules which contain elements differing in electronegativity, making them soluble in water.
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N- or C-terminal The amino acids which form polypeptides are joined by peptide bonds between the amino group of one amino acid and the carboxy group of the next.
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While determining the polypeptide sequence resulting from gene translation is straightforward, determining the actual three-dimensional (3D) structure requires some sophisticated experimental techniques.
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The polypeptide is ultimately folded into a 3-dimensional protein structure, which will go on to perform some specific function in the cell such as an enzyme subunit or cell membrane component.
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A regular element of secondary structure in proteins, in which two or more extended strands of the polypeptide chain lie side by side (running either parallel or antiparallel), ...
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Amino acids bind by forming a peptide bond.
Linear polymers of amino acids are called polypeptides.
Large polypeptides are called proteins.
A restricted set of 20 amino acids constitute the universal building blocks of proteins.
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(a small protein having two polypeptide chains) and immunoglobulin molecules, for example, have
interchain
and
intrachain
disulfide bonds. Endothelin and HLA molecules also have disulfide bonds.
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translation - process whereby mRNA code is used by the ribosome to synthesize a polypeptide chain (protein) from amino acid precursors.
transposable element - see transposon ...
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disulfide bond - covalent intrachain bonds found in protein molecules; covalent linking of two -SH groups of neighboring cysteine residues in a folded polypeptide chain. These bonds are rarely, if ever found in the cytosol.
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