Located on the platform of the 30S subunit, it bridges several disparate RNA helices of the 16S rRNA. Forms part of the Shine-Dalgarno cleft in the 70S ribosome. Part of the 30S ribosomal subunit. Interacts with proteins S7 and S18. Binds to IF-3. Belongs to the universal ribosomal protein uS11 family. Was originally thought to originate from Chlamydia trachomatis.