1) Using Mycobacterium avium as the experimental material, careful reevaluation of the various fractional quantative measuring methods for the nucleic acids (RNA, DNA, etc.) such as the Ogur-Rosen, the Schmidt Thannbauser, or the Schneider method revealed these methods to be inadequate for certain specific purposes.
This report deals with these inadequacies and the reasons that the above mentional methods do not meet the requirements.
2) Measurement of the Ba-Fraction of the acid-soluble phosphates revealed no difference between the SM-sensitive fraction, and SM-insensitive one.
3) In the quantitative analysis of the Nucleo acids of the SM-sensitive Mycobacterium avium and the SM-insensitive bacilli, no considerable effects of the SM on the contents of RNA and DNA could be found.
4) It was proven that RNA was extracted from Mycobacterium avium, by being tracted with TCA for many hours at room-temperature. Mixing of protein and DNA could not beobserved. From the results o4the quantative analyses performed, it may be stated that the RNA content, the ratio of the bases of RNA, the phosphatic acids and pentoses, the solubility of RNA, etc., were not effected by SM.
5) Ecteola cellulose, when used as exchanger, makes it possible simultaneously to fractionate AMP, adenyl pyrophosphate, inorganic Orthophosphate, inorganic Pyrophosphate inorganic Polyphosphate, high-molecular RNA and others by means of column chromatography. Even with this method, no noticeable effect of SM on the various groups of the phosphatic acid compounds could be observed.
6) Taking
32P's specific activity into account, the incorporation of
32P, used as a tracer, at room-temperature, with RNA by means of a TCA extraction was studied.
In the case of sensitive bacilli, the incorporation of
32P RNA was inhibited by SM, this conclusion being drawn from tests conducted on RNA which was extracted 24, 72 and 96 hours later.
In this test, in the bacilli treated with SM for 2 hours, a strong inhibition of RNA was observed, while no effect was found on DNA.
Even after treating the bacilli with SM for 12 hours, still no inhibiting effect on DNA could be noticed.
On the other hand, the insensitive bacilli schowed no inhibiting effect either RNA or DNA.
7) After detracting TCA from the material extracted from RNA by means of TCA extraction, this material, using Dowex 1 (X2) and employing the formic acid group as the reagent, was tested through the use of column chromatography, a complex migration pattern consiting of various Olyonucleotides mixed with mononucleotides.
SM also inhibited the incorporation of
32P with these nucleotides.
8) The sudy of sensitive bacilli with
32P as a tracer revealed the inhibiting effect of SM on the synthesis of polyphosphates.
On insensitive bacilli, SM showed no such effect.
9) With respect to the inhibition by the incorporation of
32P with cytdylic acid. Adenylic acid and polyphosphates of RNA, the results of this study were as follows a) The bacilli suspended in a Sauton media, which state may be considered as being an ideal physiological condition, showed the remarkable rate of inhibition of 20%.
b) The inhibition, on the bacilli suspended in a buffer solution of phosphoric acidd attained a rate of from 33 to 34%.
c) The inhibition hardly could be observed in the bacilli suspended in water and the maintenance-metabolism of the bacilli-cellule was not suppressed by the SM.
Specifically, SM impedes the bio-synthesis of RNA and the phosphates, not the more exchange reaction.
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