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- W2053757435 abstract "The A component of D factor (DfA) was overproduced during development of wild type Polyspondylium violaceum strain China after starvation in liquid medium. Crude DfA excreted by strain China was partially purified by ultrafiltration using Amicon YM10 and YM2 filters with DfA extracted from the filtrate by absorption onto a preparative grade C-18 resin. The concentrated material was further purified on a C-18 analytical column using both acetonitrile:water and methanol:water gradients. This highly purified fraction was a single component with a final specific activity of greater than 10(6) units per mg dry weight. Purified DfA is red having a broad visible absorbance at 500 nm and a ultraviolet (uv) absorbance at 290-300 nm. The red chromophore is sensitive to pH and to oxidation-reduction. 1H and 13C nmr studies with purified DfA indicate that it is a C11 compound with both polar and non-polar regions. The non-polar region has been identified as a hexanone and is the same as the side chain of DIF from Dictyostelium discoideum. Purified DfA has been used in studies with the D factor non-producing mutant, tsg-119 cyc-1 aggA586 (A586), to show that neither production of glorin nor chemotactic sensitivity to glorin are affected by D factor. However, founder cells develop in A586 mutant populations only after addition of D factor. These data suggest that DfA may be necessary for induction of aggregate formation by aggregation-competent amoebae." @default.
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- W2053757435 date "1988-01-01" @default.
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- W2053757435 title "Purification, characterization, and partial structure of D factor fromPolysphondylium violaceum" @default.
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- W2053757435 doi "https://doi.org/10.1002/dvg.1020090441" @default.
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