Occurrence in the archaebacterium Sulfolobus solfataricus of a ribosomal protein complex corresponding to Escherichia coli (L7/L12)4.L10 and eukaryotic (P1)2/(P2)2.P0 - PubMed (original) (raw)
Comparative Study
. 1990 Nov 5;265(31):18757-61.
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- PMID: 2121730
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Comparative Study
Occurrence in the archaebacterium Sulfolobus solfataricus of a ribosomal protein complex corresponding to Escherichia coli (L7/L12)4.L10 and eukaryotic (P1)2/(P2)2.P0
C Casiano et al. J Biol Chem. 1990.
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Abstract
Two-dimensional electrophoresis of total protein from 50 S ribosomal subunits of the archaebacterium Sulfolobus solfataricus demonstrated a complex between two proteins that was stable in 6 M urea, but dissociable in detergent or below pH 5.5. The proteins, numbered L1 and L10 according to their electrophoretic mobilities, corresponded to Escherichia coli ribosomal proteins L10 and L7/L12, respectively. The members of the complex were therefore designated Sso L10e and Sso L12e. Sso L12e had other properties in common with E. coli L7/L12: low molecular weight, relative acidity, selective release from the ribosome by high salt/ethanol, and dimeric structure. The Sso L12e.Sso L10e complex was isolated by gel filtration of total 50 S proteins in 4 M urea. The stoichiometry of the components was approximately four copies of Sso L12e to one copy of Sso L10e. The occurrence in an archaebacterium of a complex of acidic ribosomal proteins similar to E. coli (L7/L12)4.L10 and eukaryotic (P1)2/(P2)/.P0 strongly supports the concept that this element of quaternary structure is a major conserved feature of the ribosome and reaffirms its importance in the translocation step of protein synthesis.
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