Summary
The binding and uptake of nick-translated 32P-labeled pBR322 by Anacystis nidulans 6301 have been characterized. Both processes were considerably enhanced in permeaplasts compared to cells. The breakdown of labeled DNA was not correlated with binding or uptake by permeaplasts or cells. Uptake of DNA by permeaplasts was unaffected by: Mg2+ or Ca2+, light, or inhibitors of photophosphorylation such as valinomycin or gramicidin D in the presence or absence of NH4Cl. ATP at 2.5–10 mM inhibited both binding and uptake of labeled DNA by permeaplasts of A. nidulans whereas the ATP analog adenyl-5-yl imido-diphosphate was non-inhibitory in the same concentration range. In contrast to transformation of A. nidulans 6301 cells to ampicillin-resistance by pBR322, transformation to kanamycin-resistance by the plasmid pHUB4 was considerably enhanced in the dark. The transformation efficiency for permeaplasts by the plasmid pCH1 was 59% and 8% in the dark and light, respectively, whereas transformation of permeaplasts by pBR322 at an efficiency of 16% was absolutely light-dependent.
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Daniell, H., McFadden, B.A. Characterization of DNA uptake by the cyanobacterium Anacystis nidulans . Molec. Gen. Genet. 204, 243–248 (1986). https://doi.org/10.1007/BF00425505
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DOI: https://doi.org/10.1007/BF00425505