A fumonisin biosynthetic gene cluster in Fusarium oxysporum strain O-1890 and the genetic basis for B versus C fumonisin production.
Most species of Fusarium that produce fumonisin mycotoxins produce predominantly B fumonisins (FBs). However, Fusarium oxysporum strain O-1890 produces predominantly C fumonisins (FCs). In this study, the nucleotide sequence of the fumonisin biosynthetic gene (FUM) cluster in strain O-1890 was determined. The order and orientation of FUM genes were the same as in the previously described clusters in Fusarium verticillioides and Fusarium proliferatum. Coding regions of F. oxysporum and F. verticillioides FUM genes were 88-92% identical, but regions flanking the clusters did not share significant identity. The FUM cluster gene FUM8 encodes an alpha-oxoamine synthase, and fum8 mutants of F. verticillioides do not produce fumonisins. Complementation of a fum8 mutant with the F. verticillioidesFUM8 restored FB production. Complementation with F. oxysporumFUM8 also restored production, but the fumonisins produced were predominantly FCs. These data indicate that different orthologues of FUM8 determine whether Fusarium produces predominantly FBs or FCs.
Proctor
Robert H
RH
National Center for Agricultural Utilization Research, U.S. Department of Agriculture, Agricultural Research Service, Peoria, IL 61604-3999, USA.
Busman
Mark
M
Seo
Jeong-Ah
JA
Lee
Yin Won
YW
Plattner
Ronald D
RD
D000595:Amino Acid Sequence; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics; D037341:Fumonisins / Q000737:chemistry / Q000145:classification / Q000378:metabolism*; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D005670:Fusarium / Q000235:genetics* / Q000378:metabolism; D005800:Genes, Fungal; D005816:Genetic Complementation Test; D008969:Molecular Sequence Data; D005810:Multigene Family; D009154:Mutation; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA
D004271:DNA, Fungal; D037341:Fumonisins; D005656:Fungal Proteins