One of the primary rRNA binding proteins, it binds directly to 16S rRNA where it helps nucleate assembly of the platform and body of the 30S subunit by bringing together and stabilizing interactions between several different RNA helices. The combined cluster of proteins S8, S12 and S17 appears to hold together the shoulder and platform of the 30S subunit. Part of the 30S ribosomal subunit. Contacts protein S12. Increased generation time and a temperature-sensitive phenotype. Belongs to the universal ribosomal protein uS17 family.