Calza RE, Lurquin PF. In-vitro transcription in tobacco chromatin.
PLANTA 1983;
159:172-177. [PMID:
24258139 DOI:
10.1007/bf00392989]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/1983] [Accepted: 06/10/1983] [Indexed: 06/02/2023]
Abstract
A method is described to isolate transcriptionally active Nicotiana tabacum L. cv. Xanthi chromatin from suspension-cultured cells. Enzymatic preparation of protoplasts with solubilization of the plasma membrane, Triton X-100 and homogenization resulted in chromatin free from cellular debris. Incroporation of [(3)H]uridine triphosphate into RNA increased for more than 30 min at 30° C. Transcriptional activity was maximally stimulated at 10 mM MgCl2, 200 mM (NH4)2SO4 and 150 mM KCl. The in-vitro synthesized RNA was found to contain 3.8% polyadenylated RNA. The results of digestion studies with ribonuclease, heat and detergent inactivation studies, α-amanitin and actinomycin D inhibitor effects, as well as dependency on ribonucleotide triphosphates, showed that the activity recorded in the tobacco chromatin was bona-fide enzymatic RNA transcription. There also was marked stimulation of transcriptional activity when exogenous DNA was added to the assay mixture.
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