Membrane anchor subunit of 8-methylmenaquinol:fumarate reductase (MFR), that catalyzes the reduction of fumarate using 8-methylmenaquinol-6 as electron donor. The complex shows no succinate oxidation activity. Is involved in anaerobic metabolism. SdhE likely contains the quinol/quinone binding site. 8-methylmenaquinone-6 + succinate = 8-methylmenaquinol-6 + fumarate The MFR complex is composed of three subunits: a flavoprotein (SdhA), an iron-sulfur protein (SdhB), and one hydrophobic anchor protein (SdhE). Membrane association is most likely mediated via amphipathic helices.