Development of an improved monoclonal antibody‐based Elisa for fumonisin b1–3and the use of molecular modeling to explain observed detection limits
- 1 January 1995
- journal article
- research article
- Published by Informa UK Limited in Food and Agricultural Immunology
- Vol. 7 (2), 109-122
- https://doi.org/10.1080/09540109509354870
Abstract
Monoclonal antibodies were prepared against the fumonisins, a group of mycotoxins produced by the plant pathogen, Fusarium moniliforme. Splenic lymphocytes, from Balb/c mice immunized with fumonisin B1‐ovalbumin conjugate, were fused with SP2/O myeloma cells, and 14 hybridomas were selected. In a competitive enzyme‐linked immunosorbent assay, fumonisin B1‐bovine serum albumin and free fumonisin B1 (FB1) competed for the monoclonal antibody. The concentrations of FB1 required to inhibit 50% antibody binding (IC50) ranged from 300 to 670 ppb. Antibodies also cross‐reacted with fumonisins B2 and B3 (FB2, FB3), and the hydrolyzed backbone of fumonisin B1 (HB‐FB1). None of the 14 monoclonal antibodies recognized the sphingolipids, sphingosine and sphinganine, that are structurally similar to the backbone of the fumonisins. Three‐dimensional computer models of FB1, FB2 and FB3 show the amine backbone folding with the two esterified trimethyl‐propane‐1,2,3‐tricarboxylic acid side‐chains to form a cage into which the hydroxyl and acid groups of these fumonisins extend. The HB‐FB1 molecule, with the two trimethyl‐propane‐1,2,3‐tricarboxylic acid esterified moieties at carbons 14 and 15 removed, does not possess two of the three branches which are folded together with inter‐hydrogen bonding to formulate the three‐dimensional structure that makes up the cage feature of FB1, FB2 and FB3. Because of the unexpected folding of the three arms to make a cage of FB1, attachment of the protein to the amine group, which is close to, or appears to be pari of, the epitope, may have allowed the immune system of the mouse to produce antibodies more specific for the FB1‐protein conjugate than to free FB1.Keywords
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