This short domain is found at the C-terminus of many helicase proteins, including ATP-dependent rRNA helicase SPB4 from Saccharomyces cerevisiae, which is involved in the biogenesis of 60S ribosomal subunits. SPB4 is organised into four domains: dual ...
This short domain is found at the C-terminus of many helicase proteins, including ATP-dependent rRNA helicase SPB4 from Saccharomyces cerevisiae, which is involved in the biogenesis of 60S ribosomal subunits. SPB4 is organised into four domains: dual RecA domains (Pfam:PF00270 and Pfam:PF00271), a C-terminal extension (CTE, represented by this entry) and a C-terminal tail (Pfam:PF23681). This domain packs closely onto the catalytic core and engages the four nucleotides immediately 5' to those within the RNA binding pocket. It shows a mainly alpha- helical structure [1].
The Prosite family is restricted to DEAD/H helicases, whereas this domain family is found in a wide variety of helicases and helicase related proteins. It may be that this is not an autonomously folding unit, but an integral part of the helicase.