An arabinosyltransferase is a transferaseenzyme acting upon arabinose.[1]
This enzyme is involved in polymerisation of arabinogalactan (an essential component of the mycobacterial cell wall). Mycobacterially, the more precise term is arabinofuranosyltransferase, since the arabinose residues occur only in a furanose form.
This enzyme has important clinical applications as it is believed to be the target of the antimycobacterial drug ethambutol.[2]