This family contains the C-terminal domain of ribosomal protein TL5. The N-terminal domain, which binds to 5S rRNA, is contained in family Ribosomal_L25p, Pfam:PF01386. Full length (N- and C-terminal domain) homologues of TL5 are also known as CTC proteins. TL5 or CTC are not found in Eukarya or Archaea. In some Bacteria, including E. coli, this ribosomal subunit occurs as a single domain protein (named Ribosomal subunit L25), where the only domain is homologous to TL5 N-terminal domain (hence included in family Pfam:PF01386). The function of the C-terminal domain of TLC is at present unknown.

1: Structure of ribosomal protein TL5 complexed with RNA provides new insights into the CTC family of stress proteins. Fedorov R, Meshcheryakov V, Gongadze G, Fomenkova N, Nevskaya N, Selmer M, Laurberg M, Kristensen O, Al-Karadaghi S, Liljas A, Garber M, Nikonov S; Acta Crystallogr D Biol Crystallogr. 2001;57:968-976. PMID:11418764