5.1.3.29 decamer crystallographic data 723846 5.1.3.29 decamer crystallograpic data, FucU forms a decameric toroid with each active site formed by two adjacent subunits 725706 5.1.3.29 additional information FucU seems to require multimeric or dimeric structures for its enzymatic activity, because the N-terminally His-tagged FucU is an inactive monomer 725359 5.1.3.29 additional information mainly homodimer, but exists also as homotetramer, homooctamer, and homodecamer. The homodimeric form seems to be catalytically inactive 725106