Enzymatic reactions [BR:br08201]
1. Oxidoreductase reactions
1.3 Acting on the CH-CH group of donors
1.3.8 With a flavin as acceptor
1.3.8.12
R09293 (2S)-Methylsuccinyl-CoA + Electron-transferring flavoprotein <=> 2-Methylfumaryl-CoA + Reduced electron-transferring flavoprotein