The gene ipdB2 (REQ_00860) is an paralog of idpB of Rhodococcus
equi but is localized outside of the cholesterol catabolic gene
cluster on the bacterial chromosome. Probably it is the beta
subunit of a heterodimeric coenzyme A transferase. The biological
function is not elucidated yet but it was shown that the gene
product IpdB2 (GenBank accession CBH46239) acts redundantly to IdpB
in the cholesterol catabolism that is important for pathogenicity
of R. equi.