Acrasin
Each species of slime mold has its own specific chemical messenger, which are collectively referred to as acrasins.[1] These chemicals signal that many individual cells aggregate to form a single large cell or plasmodium.[1] One of the earliest acrasins to be identified was cyclic AMP, found in the species Dictyostelium discoideum by Brian Shaffer,[2] which exhibits a complex swirling-pulsating spiral pattern when forming a pseudoplasmodium.[3]
The term acrasin was descriptively named after Acrasia from Edmund Spenser's Faerie Queene,[4] who seduced men against their will and then transformed them into beasts. Acrasia is itself a play on the Greek akrasia that describes loss of free will.
Extraction
Brian Shaffer was the first to purify acrasin, now known to be cyclic AMP, in 1954, using methanol.[2] Glorin, the acrasin of P. violaceum, can be purified by inhibiting the acrasin-degrading enzyme acrasinase with alcohol, extracting with alcohol and separating with column chromatography.[3][4]
Notes
- ^ Evidence for the formation of cell aggregates by chemotaxis in the development of the slime mold Dictyostelium discoideum - J.T.Bonner and L.J.Savage Journal of Experimental Biology Vol. 106, pp. 1, October (1947) Cell Biology
- ^ Aggregation in cellular slime moulds: in vitro isolation of acrasin - B.M.Shaffer Nature Vol. 79, pp. 975, (1953) Cell Biology
- ^ Identification of a pterin as the acrasin of the cellular slime mold Dictyostelium lacteum - Proceedings of the National Academy of Sciences United States Vol. 79, pp. 6270–6274, October (1982) Cell Biology
- ^ Hunting Slime Moulds - Adele Conover, Smithsonian Magazine Online (2001)
References
- ^ King, Robert C. (2013). A dictionary of genetics. Mulligan, Pamela Khipple, 1953-, Stansfield, William D., 1930- (8th ed.). New York: Oxford University Press. ISBN 978-0-19-937686-5. OCLC 871046520.
- ^ Shaffer, B. M. (1956-06-29). "Properties of acrasin". Science. 123 (3209): 1172–1173. Bibcode:1956Sci...123.1172S. doi:10.1126/science.123.3209.1172. ISSN 0036-8075. PMID 13337336.
- ^ Heftmann, Erich; Wright, Barbara E.; Liddel, Gerald U. (December 1959). "Identification of a Sterol with Acrasin Activity in a Slime Mold". Journal of the American Chemical Society. 81 (24): 6525–6526. doi:10.1021/ja01533a054. ISSN 0002-7863.
- ^ Shimomura, O.; Suthers, H. L.; Bonner, J. T. (1982-12-01). "Chemical identity of the acrasin of the cellular slime mold Polysphondylium violaceum". Proceedings of the National Academy of Sciences. 79 (23): 7376–7379. Bibcode:1982PNAS...79.7376S. doi:10.1073/pnas.79.23.7376. ISSN 0027-8424. PMC 347342. PMID 6961416.