Exoribonuclease II (RNase II), a product of the RNB gene, composes Ribonuclease II (IPR011804), which is present in numerous gammaproteobacteria. It has the ability to unravel the DNA helix by forming a complex with single-stranded DNA. It is one of eight distinct exoribonucleases in Escherichia coli. It is responsible for mRNA degradation and tRNA precursor processing in the terminal region.