This is one of 3 proteins that mediate the attachment of the 5S rRNA onto the large ribosomal subunit. This protein has three domains. The N-terminal one is bound on the solvent face, the middle domain fills the space between the 5S rRNA and the L11 arm contacting the 23S rRNA while the C-terminal domain is on the edge of the intersubunit interface and contacts the A site. The protein conformation changes upon binding of a tRNA mimic to the A site, although the mimic does not interact directly with CTC itself, consistent with CTCs presumed role in moderating A site binding. Part of the 50S ribosomal subunit. Contacts proteins L11 and L16, the A site tRNA, and the 5S and 23S rRNAs. Belongs to the bacterial ribosomal protein bL25 family. CTC subfamily.