N Panayotatos

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With a particulate enzyme preparation from Phaseolus aureus hypocotyls, UDP-alpha-d-[U-(14)C]galactose served as a precursor for a number of products. One of these products was characterized as a beta-(1-->4)-linked galactan. The ADP-, GDP-, TDP- and CDP- derivatives of alpha-d-galactose did not serve as biosynthetic precursors for any products insoluble in(More)
T7 endonuclease preferentially cleaves purified supercoiled pBR322 and colE1 plasmids at the single-stranded regions exposed when palindromic sequences assume cruciform structures (Panayotatos, N., and Wells, R.D. (1981) Nature 289, 466-470). In vivo, however, induction of nuclease synthesis off a cloned gene caused complete degradation of the bacterial DNA(More)
The mechanism of inhibition of RNA polymerase-catalyzed synthesis of RNA by actinomycin D and the phenan-thridinium derivatives ethidium bromide and 3,8-diamino-6-ethylphenanthridinium bromide (DEMB) is examined. A general kinetic equation describing the dependence of RNA synthesis on DNA template concentration is derived and distinct expressions(More)
A plasmid carrying the bacteriophage T7.3 endonuclease gene under the control of the lacUV5 promoter could be maintained in the transcriptionally active state only in recA+ strains. In recA- strains, endonuclease induction resulted in extensive degradation of the genomic DNA and cell death. In sharp contrast, the plasmid DNA remained intact in the(More)
The rate of RNA synthesis catalysed by DNA-dependent RNA polymerase shows a Michealis-Menten-type saturation curve with increasing template concentration. However, the apparent Km is proportional to enzyme concentration, indicating that the reaction does not obey a simple kinetic scheme. The action of inhibitors also indicates a more complex interaction(More)
Because of the palindromic character of most 6-bp restriction sites, filling-in and ligation of the protruding ends create symmetric sequences which include new 6-bp restriction sites. The old site is, in most cases, lost. After cleavage at the new palindromic site and removal of the protruding ends, a new center of symmetry is created which is often part(More)