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50S ribosomal protein L31
type B 50S ribosomal protein L31
This form of the bacterial 50S ribosomal protein L31 lacks the Zn-binding Cys pattern found in zinc-binding homologs such as RpmE of Escherichia coli or Bacillus subtilis. Many bacteria encode both forms of L31.
50S ribosomal protein L31 such as type A that binds the 23S rRNA in a Zn(II)-dependent manner, and type B that binds no Zn(II), is maximally induced 30 minutes under zinc-limiting conditions, and is repressed by the zinc uptake regulation protein Zur
This family consists exclusively of bacterial (and organellar) 50S ribosomal protein L31. In some species, such as Bacillus subtilis, this protein exists in two forms (RpmE and YtiA), one of which (RpmE) contains a pair of motifs, CXC and CXXC, for binding zinc.
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