| peptide phi | A 27-amino acid peptide with histidine at the n-terminal and isoleucine amide at the c-terminal. The exact amino acid composition of the peptide is species dependent. The peptide is secreted in the intestine, but is found in the nervous system, many organs, and in the majority of peripheral tissues. It has a wide range of biological actions, affecting the cardiovascular, gastrointestinal, respiratory, and central nervous systems. (12 Dec 1998) |
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| peptide receptor | Specific receptor for peptide neurotransmitters. (18 Nov 1997) |
| peptide synthases | <enzyme> Enzymes that catalyze the joining of an acid and an amino acid by the formation of a carbon-nitrogen bond. Registry number: EC 6.3.2. (12 Dec 1998) |
| peptide synthetase | Any enzyme that catalyses the synthesis of peptide bonds, with the hydrolysis of a nucleoside triphosphate. (05 Mar 2000) |
| peptide t | <chemical> N-(n-(n(2)-(n-(n-(n-(n-d-alanyl l-seryl)-l-threonyl)-l-threonyl) l-threonyl)-l-asparaginyl)-l-tyrosyl) l-threonine. Octapeptide sharing sequence homology with HIV envelope protein gp120. It is potentially useful as antiviral agent in aids therapy. The core pentapeptide sequence, ttnyt, consisting of amino acids 4-8 in peptide t, is the HIV envelope sequence required for attachment to the CD4 receptor. Chemical name: L-Threonine, N-(N-(N2-(N-(N-(N-(N-D-alanyl-L-seryl)-L-threonyl)-L-threonyl)-L-threonyl)-L-asparaginyl)-L-tyrosyl)- (12 Dec 1998) |
| peptide termination factors | Proteins that are exclusively involved in the termination reactions of protein synthesis on the ribosome. (12 Dec 1998) |
| peptide-tryptophan 2,3-dioxygenase | <enzyme> Catalyses the oxidation of peptide tryptophan to form peptide formylkynurenine Registry number: EC 1.13.11.26 Synonym: tryptophan pyrrolooxygenase (26 Jun 1999) |
| peptide yy | A 36-amino acid peptide produced by the l cells of the distal small intestine and colon. Peptide yy inhibits gastric and pancreatic secretion. (12 Dec 1998) |
| phenylthiocarbamoyl peptide | The peptide formed by combination of phenylisothiocyanate and an alpha-amino group of a peptide. See: phenylthiohydantoin. (05 Mar 2000) |
| connecting peptide | <protein> An amino acid chain which connects the hormones insulin and proinsulin and is metabolically inactive. (09 Oct 1997) |
| connective tissue activating peptide III | Cytokine, produced from platelet basic protein, that acts as a growth factor. (18 Nov 1997) |
| corticotropin-like intermediate-lobe peptide | <protein> A product of propiomelanocortin with unknown function. Acronym: CLIP (05 Mar 2000) |
| c-peptide | <protein> C-peptide is a byproduct of normal insulin production by the beta cells in the pancreas. Normal values are 0.5 to 3.0 ng/ml. Normal levels indicate that the body is still producing its own insulin. Low levels indicate that the pancreas is producing little or no insulin. Elevations can be seen in cases of insulinomas and islet of Langerhans tumours. (27 Sep 1997) |
| cyclic peptide | A peptide that forms a ring structure; e.g., tyrocidin A, an antibiotic, is a cyclic decapeptide; valinomycin is a cyclic depsipeptide. (05 Mar 2000) |
| prenylated peptide-specific endoprotease | <enzyme> Cleaves c-terminal tripeptide from prenylated protein having c-terminal sequence caax; race is rac and a-factor converting enzyme with same activity Registry number: EC 3.4.14.- Synonym: prenylated protein endoprotease, race enzyme, isoprenylated protein endopeptidase, isoprenylated protein endoprotease (26 Jun 1999) |