This is one of 3 proteins that mediate the attachment of the 5S rRNA onto the large ribosomal subunit. Part of the 50S ribosomal subunit. Contacts the 5S rRNA; has been isolated in a complex with 5S rRNA and RL5, 5S rRNA and DNA binding protein II; 5S rRNA and RL18; 5S rRNA, RL5 and DNA binding protein II (Ref.4). Belongs to the bacterial ribosomal protein bL25 family. CTC subfamily.