Succinate--CoA ligase [GDP-forming] subunit beta, mitochondrial (EC 6.2.1.4) (GTP-specific succinyl-CoA synthetase subunit beta) (G-SCS) (GTPSCS) (Succinyl-CoA synthetase beta-G chain) (SCS-betaG)
1_MASPV 6_ AAQAG 11_ KLLRA 16_ LALRP 21_ RFLAA 26_ GSQAV 31_ QLTSR 36_ RWLNL 41_ QEYQS 46_ KKLMS 51_ DNGVR 56_ VQRFF 61_ VADTA 66_ NEALE 71_ AAKRL 76_ NAKEI 81_ VLKAQ 86_ ILAGG 91_ RGKGV 96_ FNSGL 101_ KGGVH 106_ LTKDP 111_ NVVGQ 116_ LAKQM 121_ IGYNL 126_ ATKQT 131_ PKEGV 136_ KVNKV 141_ MVAEA 146_ LDISR 151_ ETYLA 156_ ILMDR 161_ SCNGP 166_ VLVGS 171_ PQGGV 176_ DIEEV 181_ AASNP 186_ ELIFK 191_ EQIDI 196_ FEGIK 201_ DSQAQ 206_ RMAEN 211_ LGFVG 216_ PLKSQ 221_ AADQI 226_ TKLYN 231_ LFLKI 236_ DATQV 241_ EVNPF 246_ GETPE 251_ GQVVC 256_ FDAKI 261_ NFDDN 266_ AEFRQ 271_ KDIFA 276_ MDDKS 281_ ENEPI 286_ ENEAA 291_ KYDLK 296_ YIGLD 301_ GNIAC 306_ FVNGA 311_ GLAMA 316_ TCDII 321_ FLNGG 326_ KPANF 331_ LDLGG 336_ GVKEA 341_ QVYQA 346_ FKLLT 351_ ADPKV 356_ EAILV 361_ NIFGG 366_ IVNCA 371_ IIANG 376_ ITKAC 381_ RELEL 386_ KVPLV 391_ VRLEG 396_ TNVQE 401_ AQKIL 406_ NNSGL 411_ PITSA 416_ IDLED 421_ AAKKA 426_VASVA
1: GTP-specific succinyl-CoA synthetase functions in the citric acid cycle (TCA), coupling the hydrolysis of succinyl-CoA to the synthesis of GTP and thus represents the only step of substrate-level phosphorylation in the TCA. The beta subunit provides nucleotide specificity of the enzyme and binds the substrate succinate, while the binding sites for coenzyme A and phosphate are found in the alpha subunit