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In the crystal structure of the 30S ribosomal subunit from Thermus thermophilus, cysteine 24 of ribosomal protein S14 (TthS14) occupies the first position in a CXXC-X12-CXXC motif that coordinates a zinc ion. The structural and functional importance of cysteine 24, which is widely conserved from bacteria to humans, was studied by its replacement with serine and by incorporating the resulting mutant...
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