... sulphate-reducing archaeon Archaeoglobus f ulgi dus: cloning and characterization of the genes and c omparison of t heenzyme with other i ron-sulphu r flavoproteins. Microbiology 140,1273–1284.36. Hipp,W.M.,Pott,A.S.,Thumschmitz,N.,Faath,I.,Dahl,C.&Tru¨per, ... istypical of integral membrane proteins. The polypeptide with anapparent molecular mass of 53 kDa appears as a double band inunboiled samples (lanes A1 and B1).Table 1. N-Terminal sequences of the ... 1899absorption maxima at 420 nm (c band), 530 nm (b band) and 557 nm (a band) are characteristic of cytochrome b.Heme was extracted from the protein with acidic acetone and the pyridine hemochrome spectrum...