Absolute requirement of ammonium sulfate for reconstitution of active 70S ribosomes from the extreme halophilic archaeon Haloferax mediterranei.
Active 70S ribosomes from the halophilic archaeon Haloferax mediterranei have been reconstituted from their isolated rRNAs and proteins. The reconstitution procedure consists of a two-step incubation; first with 1 M ammonium sulfate and 100 mM magnesium acetate for 1 h at 42 degrees C, followed by a 90-min incubation at 50 degrees C after increasing the ammonium sulfate to 2 M final concentration. The total reconstitution of halophilic 70S ribosomes is a process with its own identity, which does not correspond to the conditions required for the reconstitution of the isolated subunits. Ammonium sulfate is the only salt capable of promoting the assembly of active ribosomes. The increase of ammonium sulfate salts in the second incubation step is obligatory for the isolation of functional particles.
Centro de Biología Molecular, CSIC-UAM, Cantoblanco, Madrid, Spain.
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D000645:Ammonium Sulfate / Q000378:metabolism* / Q000494:pharmacology; D006217:Halobacterium / Q000378:metabolism*; D012329:RNA, Bacterial / Q000378:metabolism; D012335:RNA, Ribosomal / Q000378:metabolism*; D012269:Ribosomal Proteins / Q000378:metabolism*; D012270:Ribosomes / Q000187:drug effects / Q000378:metabolism*
D012329:RNA, Bacterial; D012335:RNA, Ribosomal; D012269:Ribosomal Proteins; D000645:Ammonium Sulfate