2. Enzyme - Definition and classification

new seventh class is added by IUBMB EC 7. Translocases These enzymes catalyse the movement of ions or molecules across membranes or their separation within membranes, the reaction is designated as a transfer from ‘side 1’ to ‘side 2’ because the designations ‘in’ and ‘out’, which had previously been used, can be ambiguous. The subclasses designate the types of components transferred and the sub-sub-classes indicate the reaction processes that provide the driving force for the translocation.