The ATP-binding cassette domain 2 of RNase L inhibitor
The ABC ATPase, RNase L inhibitor (RLI), is a key enzyme in ribosomal biogenesis, formation of translation preinitiation complexes, and assembly of HIV capsids. RLI's are not transport proteins and thus cluster with a group of soluble proteins that lack the transmembrane components commonly found in other members of the family. Structurally, RLI's have an N-terminal Fe-S domain and two nucleotide-binding domains which are arranged to form two composite active sites in their interface cleft. RLI is one of the most conserved enzymes between archaea and eukaryotes with a sequence identity of more than 48%. The high degree of evolutionary conservation suggests that RLI performs a central role in archaeal and eukaryotic physiology.
Jiyao W et al.(2023). "The conserved domain database in 2023.",