Buu A, Menichi B, Heyman T
J Bacteriol. 1981 May;146(2):819-22. doi: 10.1128/jb.146.2.819-822.1981.
The thiomethylation of Bacillus subtilis tyrosine transfer ribonucleic acid (tRNATyr) (i6A) has been shown to occur during the slowing-down of growth. The extent of this modification in stationary-phase cells grown in defined medium has been determined in parallel with the sporulation frequency. We observed that the presence of phosphate repressed sporulation and also inhibited the thiomethylation of tRNATyr (i6A) of B. subtilis W168. These effects were partially eliminated by decreasing the glucose concentration until it was growth limiting. In the case of strain W23S, in which sporulation is insensitive to glucose repression, sporulation and tRNATyr thiomethylation were not inhibited by nonlimiting concentrations of phosphate. These results suggest that both sporulation and tRNATyr hyper-modification share some common regulatory process.
已表明枯草芽孢杆菌酪氨酸转移核糖核酸(tRNATyr)(i6A)的硫甲基化发生在生长减缓期间。已将在限定培养基中生长的稳定期细胞中这种修饰的程度与孢子形成频率并行测定。我们观察到磷酸盐的存在会抑制孢子形成,并且还会抑制枯草芽孢杆菌W168的tRNATyr(i6A)的硫甲基化。通过降低葡萄糖浓度直至其成为生长限制因素,这些影响会部分消除。在孢子形成对葡萄糖阻遏不敏感的W23S菌株中,非限制浓度的磷酸盐不会抑制孢子形成和tRNATyr硫甲基化。这些结果表明,孢子形成和tRNATyr过度修饰都共享一些共同的调控过程。