Molecular weights, number of amino acid residues, names of genes and operons and the position in the chromosome map of E. coli ribosomal proteins

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Organism Bacteria Escherichia coli
Reference Ulrich Stelzl, Sean Connell, Knud H Nierhaus, Brigitte Wittmann-Liebold, Ribosomal Proteins: Role in Ribosomal Functions, 2001, DOI: 10.1038/npg.els.0000687, pp.2-3 table 1
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Comments "Ribosomal proteins are defined as proteins present in stoichiometric amounts in a ribosome, whereas factors are present with a copy number less than one per ribosome. Erroneously, S22 is sometimes considered as the 22nd protein of the small ribosomal subunit from E. coli. Since this protein accumulates in ribosomes of the stationary phase but is found only in minute amounts of log-phase ribosome, it is a factor rather than a ribosomal protein according to the definition given above (see Table 1). All proteins are present in only one copy per ribosome except L7/L12. L7 is the N-acetylated form of L12, and together with L10 this protein appears as a pentameric complex L10(L7/L12)4 that was once called L8 before its multimeric structure was known. Proteins S20 and L26 have identical sequences and this protein, situated in the interface between the subunits, is also present in only one copy per 70S ribosome. The molecular weights of the ribosomal proteins, the name of their genes and the operon and the corresponding map position are compiled in Table 1."
Entered by Uri M
ID 111266