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Plant and Cell Physiology, 1984, Vol. 25, No. 7 1187-1196
© 1984

Article

Phosphorylation of Chromosomal Proteins Changes during the Development of Crown Gall Tumors1

Günter Kahl and Willi Schäfer

Department of Biology, University of Frankfurt 6000 Frankfurt/Main, Fed. Rep. Germany

Crown gall tumors were initiated on potato tuber nurse tissue by Agrobacterium tumefaciens, strain C58. Tumorous protuberances appeared some 5–8 days after infection and grew to knob-like tumors in 3–5 weeks, after which proliferation diminished continuously and then ceased in old tumors. Synthesis of RNA increased dramatically in growing tumors as did the activity of both chromatin-bound DNA-dependent RNA polymerases I and II. Chromatin-bound protein kinases accepting endogenous proteins, phosvitin, casein or histones were activated concomitantly, leading to higher phosphorylation rates of chromatin proteins during tumor development. With the transition of a normal, wounded cell into a transformed cell, the chromosomal protein pattern changed and then remained unchanged throughout tumor growth and senescence. In contrast, the phosphorylation pattern of these proteins was highly stage-specific.

1Dedicated to our friend and colleague, late Professor Dr. R. K. Tripathi (Pant-nagar University, Nainital, India).

(Received January 11, 1984; Accepted July 17, 1984)
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