Inactivation of staphylococcal enterotoxin A by chemical modification |
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Authors: | G N Stelma M S Bergdoll |
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Institution: | College of Basic Sciences and Humanities, G.B. Pant University of Agriculture & Technology, Pantnagar 263 145, India. |
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Abstract: | (3-14C)-serine was fed through cut ends of 10-day-old shoots of normal (Ganga-2) and opaque (opaque-2) maize ( L.) and allowed to be metabolized in light for 24 hours. Subsequent methanolic extraction, radiochromatographic separation and radioautographic analysis showed that 10.4 and 10.3 percent of the absorbed 14C-serine activity was incorporated into L-tryptophan by the shoot tissues of the normal and opaque maize respectively.By coupling extraction of the enzyme with ammonium sulfate precipitation (75% saturation) it was possible to show a serine-dependent indole utilization by the enzyme preparations from coleoptiles (4-day-old), kernels (18 and 28 days after anthesis) and first nodal callus tissues (one-month-old) of the two corn varieties. Furthermore, the indole disappearance from reaction mixture occurred with a concomitant transfer of (3-14C)-serine appearance into tryptophan. |
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Keywords: | To whom requests for reprints should be sent |
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