The ribosomal protein composition of the archaebacterium Sulfolobus

Summary Ribosomal subunits from the thermoacidophilic Archaebacterium Sulfolobus were purified and their protein composition analyzed by gel electrophoretic methods. A tentative nomenclature was proposed. 30S subunits contained 27, and 50S subunits 34, electrophoretically distinguishable proteins. Three additional proteins were present on both the 30S and 50S subunits. The protein pattern of three geographically different isolates of Sulfolobus (Italy, Japan, Yellowstone) were nearly identical.