Abstract
Active 50 S ribosomal subunits from Bacillus licheniformis and Bacillus subtilis can be reconstituted in vitro from dissociated RNA and proteins. The reconstituted 50 S sub-units are indistinguishable from native 50 S subunits in sedimentation on sucrose gradients and in protein composition. The procedure used is similar to that developed for reconstitution of Bacillus stearothermophilus 50 S subunits, though the optimal conditions are somewhat different. Hybrid ribosomes can be reconstituted with 23 S RNA and proteins from different sources ( B. stearothermophilus and B. licheniformis or B. subtilis). The thermal stability of these ribosomes depends on the source of the proteins, and not on the source of 23 S RNA.
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