<p>This entry represents HrpB, one of two related predicted DEAH-box ATP-dependent helicases of unknown function found in many proteobacteria, but also in a few species of other lineages. The member from <taxon tax_id="382">Rhizobium meliloti</taxon> (Sinorhizobium meliloti), designated HelO, has been studied but is not essential for growth and mutants have no obvious phenotype [<cite idref="PUB00033866"/>]. HrpB is typically about 800 residues in length, while its paralog HrpA (<db_xref db="INTERPRO" dbkey="IPR010222"/>), also uncharacterised, is about 1300 amino acids long. Related characterised eukaryotic proteins are RNA helicases associated with pre-mRNA processing [<cite idref="PUB00033619"/>].</p> RNA helicase, ATP-dependent DEAH box, HrpB type