This is one of the proteins that binds to the 5S RNA in the ribosome where it forms part of the central protuberance. Part of the 50S ribosomal subunit; part of the 5S rRNA/L5/L18/L25 subcomplex. Contacts the 5S rRNA. Binds to the 5S rRNA independently of L5 and L18 (By similarity). Belongs to the bacterial ribosomal protein bL25 family. CTC subfamily.