This article is a US Government work and is in the public domain in the USA.
Alteration in sphingolipid metabolism: bioassays for fumonisin- and ISP-I-like activity in tissues, cells and other matrices†
Article first published online: 13 DEC 2000
This article is a US government work and is in the public domain in the United States.
Volume 7, Issue 6, pages 407–414, November/December 1999
How to Cite
Riley, R. T., Norred, W. P., Wang, E. and Merrill, A. H. (1999), Alteration in sphingolipid metabolism: bioassays for fumonisin- and ISP-I-like activity in tissues, cells and other matrices. Nat. Toxins, 7: 407–414. doi: 10.1002/1522-7189(199911/12)7:6<407::AID-NT84>3.0.CO;2-0
- Issue published online: 13 DEC 2000
- Article first published online: 13 DEC 2000
- Manuscript Accepted: 20 JUL 2000
- Manuscript Received: 3 NOV 1999
- ISP-I, myriocin;
- ceramide synthase;
- serine palmitoyltransferase
The first discovered naturally occurring inhibitor of de novo sphingolipid biosynthesis was fumonisin B1. There are now 11 identified fungal inhibitors of ceramide synthase or ‘fumonisin B1-like’ compounds. With the exception of the australifungins, all other fungal ceramide synthase inhibitors are structurally sphingoid-like. There are several recently discovered fungal inhibitors of another enzyme in the de novo sphingolipid biosynthesis pathway: serine palmitoyltransferase (SPT). One of the SPT inhibitors is named ISP-I. While ceramide synthase inhibitors are toxic to animals, plants and fungi, the SPT inhibitors are not known to cause animal or plant disease, but are potent inhibitors of fungal growth. Very little is known about their toxicity in animals. There are at least 24 fungal SPT inhibitors produced by a variety of fungi. Given that the fungal inhibitors of sphingolipid biosynthesis are chemically and biologically diverse, two bioassays have been developed to screen for fumonisin-like or ISP-I-like activity in naturally contaminated products or fungal culture materials. These bioassays are based on the changes in free sphingoid base concentration that occur when the ceramide synthase or SPT are inhibited. The bioassays have the advantage that they are functionally rather than chemically specific and thus will detect ceramide synthase and SPT inhibitors regardless of their chemical structure. Published in 1999 by John Wiley & Sons, Ltd.