S12-like family, 40S ribosomal protein S23 subfamily; S23 is located at the interface of the large and small ribosomal subunits of eukaryotes, adjacent to the decoding center. It interacts with domain III of the eukaryotic elongation factor 2 (eEF2), which catalyzes the translocation of the growing peptidyl-tRNA to the P site to make room for the next aminoacyl-tRNA at the A (acceptor) site. Through its interaction with eEF2, S23 may play an important role in translocation. Also members of this subfamily are the archaeal 30S ribosomal S12 proteins. Prokaryotic S12 is essential for maintenance of a pretranslocation state and, together with S13, functions as control element for the rRNA- and tRNA-driven movements of translocation. S12 and S23 are also implicated in translation accuracy. Antibiotics such as streptomycin bind S12/S23 and cause the ribosome to misread the genetic code.