6.2.1.4 ? alphaxbetay, x * 35000 + y * 44500, ATP-specific succinyl-CoA synthetase and GTP-specific succinyl-CoA synthetase incorporate the same alpha-subunit, SDS-PAGE 651897 6.2.1.4 ? precursor of alpha-subunit 31630, calculation from nucleotide sequence 782 6.2.1.4 ? x * 35000, SDS-PAGE -, 744369 6.2.1.4 ? x * 42740, subunit beta, calculated from amino acid sequence 746174 6.2.1.4 ? x * 43600, SDS-PAGE 744272 6.2.1.4 heterodimer - 743957 6.2.1.4 heterodimer the enzyme is composed of an alpha subunit, encoded by SUCLG1, and a beta subunit, encoded by either SUCLA2 or SUCLG2. The alpha-subunit forms a heterodimer with either of its beta-subunits, resulting in an ADP-forming succinate-CoA ligase, EC 6.2.1.5, and a GDP-forming succinate-CoA ligase, EC 6.2.1.4, respectively 693488 6.2.1.4 heterotetramer alpha2beta2 726583 6.2.1.4 additional information structure comparisons, overview 726583