An oligopeptide, often just called peptide (oligo-, "a few"), consists of two to twenty amino acids and can include dipeptides, tripeptides, tetrapeptides, and pentapeptides. There have been more than 600 oligopeptide variants described, and about half of them are separated into seven classes (based on molecular structure): aeruginosins, cyanopeptolins, microcystins, microviridins, microginins, anabaenopeptins and cyclamides. Microcystins are best studied, because of their potential toxicity impact in drinking water. A review of some oligopeptides found that the largest class are the cyanopeptolins (40.1%), followed by microcystins (13.4%).
Examples of oligopeptides include:
- Amanitins - Cyclic peptides taken from carpophores of several different mushroom species. They are potent inhibitors of RNA polymerases in most eukaryotic species, the prevent the production of mRNA and protein synthesis. These peptides are important in the study of transcription. Alpha-amanitin is the main toxin from the species Amanita phalloides, poisonous if ingested by humans or animals.
- Antipain - An oligopeptide produced by various bacteria which acts as a protease inhibitor.
- Ceruletide - A specific decapeptide found in the skin of Hyla caerulea, the Australian green tree frog. Ceruletide has very much in common with regards to action and composition to cholecystokinin. It stimulates gastric, biliary, and pancreatic secretion; and certain smooth muscle. It is used to induce pancreatitis in experimental animal models.
- Glutathione - A tripeptide with many roles in cells. It conjugates to drugs to make them more soluble for excretion, is a cofactor for some enzymes, is involved in protein disulfide bond rearrangement and reduces peroxides.
- Leupeptins - A group of acylated oligopeptides produced by Actinomycetes that function as protease inhibitors. They have been known to inhibit to varying degrees trypsin, plasmin, kallikreins, papain and the cathepsins.
- Netropsin - A basic polypeptide isolated from Streptomyces netropsis. It is cytotoxic and its strong, specific binding to A-T areas of DNA is useful to genetics research.
- Pepstatins - N-acylated oligopeptides isolated from culture filtrates of Actinomycetes, which act specifically to inhibit acid proteases such as pepsin and renin.
- Peptide T - 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 may be 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.
- Phalloidin - A very toxic polypeptide isolated mainly from Amanita phalloides (Agaricaceae) or death cap; causes fatal liver, kidney and CNS damage in mushroom poisoning; used in the study of liver damage.
- Teprotide - A man made nonapeptide (Pyr-Trp-Pro-Arg-Pro-Gln-Ile-Pro-Pro) which is exactly the same as the peptide from the venom of the snake, Bothrops jararaca. It inhibits kininase II and ANGIOTENSIN I and has been proposed as an antihypertensive agent.
- Tuftsin - N(2)-((1-(N(2)-L-Threonyl)-L-lysyl)-L-prolyl)-L-arginine. A tetrapeptide manufactured in the spleen by enzymatic cleavage of a leukophilic gamma-globulin. It stimulates the phagocytic activity of blood polymorphonuclear leukocytes and neutrophils in particular. The peptide is located in the Fd fragment of the gamma-globulin molecule.
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- Martin Welker and Hans Von Döhren (2006). "Cyanobacterial peptides – Nature's own combinatorial biosynthesis". FEMS Microbiology Reviews. doi:10.1111/j.1574-6976.2006.00022.x.
- George E. Chlipala, Shunyan Mo, and Jimmy Orjala (2011). "Chemodiversity in Freshwater and Terrestrial Cyanobacteria – a Source for Drug Discovery". Curr Drug Targets.
- Ramsy Agha, Samuel Cirés, Lars Wörmer and Antonio Quesada (2013). "Limited Stability of Microcystins in Oligopeptide Compositions of Microcystis aeruginosa (Cyanobacteria): Implications in the Definition of Chemotypes". Toxins. doi:10.3390/toxins5061089.
- Argos, Patrick. "An Investigation of Oligopeptides Linking Domains in Protein Tertiary Structures and Possible Candidates for General Gene Fusion" (PDF). European Molecular Biology Laboratory. Retrieved 28 July 2014.
- Structural Biochemistry/Proteins/Amino Acids (Wikibooks)