This motif is found in Protein AIR2 from Saccharomyces cerevisiae, also known as Arginine methyltransferase-interacting RING finger protein 2, and similar proteins from yeasts. AIR2 is an RNA-binding subunit of the TRAMP complex which has a poly(A) RNA polymerase activity and is involved in a post-transcriptional quality control mechanism limiting inappropriate expression of genetic information. This protein contain five tandemly arranged zinc-knuckle (ZnK) motifs of the CCHC-type (CX2CX4HX4C), which been shown to bind nucleic acids and proteins in unrelated proteins. This entry represents the fourth CCHC-type 1 zinc finger (ZnK4) of AIR2, which is important for TRAMP functions and integrity [1,2].

1: Air2p is critical for the assembly and RNA-binding of the TRAMP complex and the KOW domain of Mtr4p is crucial for exosome activation. Holub P, Lalakova J, Cerna H, Pasulka J, Sarazova M, Hrazdilova K, Arce MS, Hobor F, Stefl R, Vanacova S; Nucleic Acids Res. 2012;40:5679-5693. PMID:22402490

2: Structure and function of the polymerase core of TRAMP, a RNA surveillance complex. Hamill S, Wolin SL, Reinisch KM; Proc Natl Acad Sci U S A. 2010;107:15045-15050. PMID:20696927