ID   ODO2_HAEIN              Reviewed;         409 AA.
AC   P45302;
DT   01-NOV-1995, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1995, sequence version 1.
DT   02-SEP-2026, entry version 159.
DE   RecName: Full=Dihydrolipoyllysine-residue succinyltransferase component of 2-oxoglutarate dehydrogenase complex;
DE            EC=2.3.1.61 {ECO:0000250|UniProtKB:P0AFG6};
DE   AltName: Full=2-oxoglutarate dehydrogenase complex component E2;
DE            Short=OGDC-E2;
DE   AltName: Full=Dihydrolipoamide succinyltransferase component of 2-oxoglutarate dehydrogenase complex;
GN   Name=sucB; OrderedLocusNames=HI_1661;
OS   Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd).
OC   Bacteria; Pseudomonadati; Pseudomonadota; Gammaproteobacteria;
OC   Pasteurellales; Pasteurellaceae; Haemophilus.
OX   NCBI_TaxID=71421;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 51907 / DSM 11121 / KW20 / Rd;
RX   PubMed=7542800; DOI=10.1126/science.7542800;
RA   Fleischmann R.D., Adams M.D., White O., Clayton R.A., Kirkness E.F.,
RA   Kerlavage A.R., Bult C.J., Tomb J.-F., Dougherty B.A., Merrick J.M.,
RA   McKenney K., Sutton G.G., FitzHugh W., Fields C.A., Gocayne J.D.,
RA   Scott J.D., Shirley R., Liu L.-I., Glodek A., Kelley J.M., Weidman J.F.,
RA   Phillips C.A., Spriggs T., Hedblom E., Cotton M.D., Utterback T.R.,
RA   Hanna M.C., Nguyen D.T., Saudek D.M., Brandon R.C., Fine L.D.,
RA   Fritchman J.L., Fuhrmann J.L., Geoghagen N.S.M., Gnehm C.L., McDonald L.A.,
RA   Small K.V., Fraser C.M., Smith H.O., Venter J.C.;
RT   "Whole-genome random sequencing and assembly of Haemophilus influenzae
RT   Rd.";
RL   Science 269:496-512(1995).
CC   -!- FUNCTION: E2 component of the 2-oxoglutarate dehydrogenase (OGDH)
CC       complex which catalyzes the second step in the conversion of 2-
CC       oxoglutarate to succinyl-CoA and CO(2). {ECO:0000250|UniProtKB:P0AFG6}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=N(6)-[(R)-dihydrolipoyl]-L-lysyl-[protein] + succinyl-CoA =
CC         N(6)-[(R)-S(8)-succinyldihydrolipoyl]-L-lysyl-[protein] + CoA;
CC         Xref=Rhea:RHEA:15213, Rhea:RHEA-COMP:10475, Rhea:RHEA-COMP:20092,
CC         ChEBI:CHEBI:57287, ChEBI:CHEBI:57292, ChEBI:CHEBI:83100,
CC         ChEBI:CHEBI:83120; EC=2.3.1.61;
CC         Evidence={ECO:0000250|UniProtKB:P0AFG6};
CC   -!- COFACTOR:
CC       Name=(R)-lipoate; Xref=ChEBI:CHEBI:83088; Evidence={ECO:0000250};
CC       Note=Binds 1 lipoyl cofactor covalently. {ECO:0000250};
CC   -!- PATHWAY: Amino-acid degradation; L-lysine degradation via saccharopine
CC       pathway; glutaryl-CoA from L-lysine: step 6/6.
CC   -!- SUBUNIT: Forms a 24-polypeptide structural core with octahedral
CC       symmetry. Part of the 2-oxoglutarate dehydrogenase (OGDH) complex
CC       composed of E1 (2-oxoglutarate dehydrogenase), E2 (dihydrolipoamide
CC       succinyltransferase) and E3 (dihydrolipoamide dehydrogenase); the
CC       complex contains multiple copies of the three enzymatic components (E1,
CC       E2 and E3). {ECO:0000250|UniProtKB:P0AFG6}.
CC   -!- SIMILARITY: Belongs to the 2-oxoacid dehydrogenase family.
CC       {ECO:0000305}.
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DR   EMBL; L42023; AAC23307.1; -; Genomic_DNA.
DR   PIR; D64135; D64135.
DR   AlphaFoldDB; P45302; -.
DR   SMR; P45302; -.
DR   STRING; 71421.HI_1661; -.
DR   EnsemblBacteria; AAC23307; AAC23307; HI_1661.
DR   KEGG; hin:HI_1661; -.
DR   PATRIC; fig|71421.8.peg.1739; -.
DR   eggNOG; COG0508; Bacteria.
DR   HOGENOM; CLU_016733_0_0_6; -.
DR   OrthoDB; 9805770at2; -.
DR   PhylomeDB; P45302; -.
DR   BioCyc; HINF71421:G1GJ1-1678-MONOMER; -.
DR   UniPathway; UPA00868; UER00840.
DR   Proteomes; UP000000579; Chromosome.
DR   GO; GO:0005829; C:cytosol; IBA:GO_Central.
DR   GO; GO:0045252; C:oxoglutarate dehydrogenase complex; IEA:InterPro.
DR   GO; GO:0004149; F:dihydrolipoyllysine-residue succinyltransferase activity; ISS:UniProtKB.
DR   GO; GO:0006099; P:tricarboxylic acid cycle; IBA:GO_Central.
DR   CDD; cd06849; lipoyl_domain; 1.
DR   FunFam; 3.30.559.10:FF:000005; Dihydrolipoyllysine-residue succinyltransferase component of 2-oxoglutarate dehydrogenase complex; 1.
DR   Gene3D; 2.40.50.100; -; 1.
DR   Gene3D; 3.30.559.10; Chloramphenicol acetyltransferase-like domain; 1.
DR   Gene3D; 4.10.320.10; E3-binding domain; 1.
DR   InterPro; IPR003016; 2-oxoA_DH_lipoyl-BS.
DR   InterPro; IPR050537; 2-oxoacid_dehydrogenase.
DR   InterPro; IPR001078; 2-oxoacid_DH_actylTfrase.
DR   InterPro; IPR000089; Biotin_lipoyl.
DR   InterPro; IPR023213; CAT-like_dom_sf.
DR   InterPro; IPR036625; E3-bd_dom_sf.
DR   InterPro; IPR004167; PSBD.
DR   InterPro; IPR011053; Single_hybrid_motif.
DR   InterPro; IPR006255; SucB.
DR   NCBIfam; NF004309; PRK05704.1; 1.
DR   NCBIfam; TIGR01347; sucB; 1.
DR   PANTHER; PTHR43416:SF5; DIHYDROLIPOYLLYSINE-RESIDUE SUCCINYLTRANSFERASE COMPONENT OF 2-OXOGLUTARATE DEHYDROGENASE COMPLEX, MITOCHONDRIAL; 1.
DR   PANTHER; PTHR43416; DIHYDROLIPOYLLYSINE-RESIDUE SUCCINYLTRANSFERASE COMPONENT OF 2-OXOGLUTARATE DEHYDROGENASE COMPLEX, MITOCHONDRIAL-RELATED; 1.
DR   Pfam; PF00198; 2-oxoacid_dh; 1.
DR   Pfam; PF00364; Biotin_lipoyl; 1.
DR   Pfam; PF02817; E3_binding; 1.
DR   SUPFAM; SSF52777; CoA-dependent acyltransferases; 1.
DR   SUPFAM; SSF47005; Peripheral subunit-binding domain of 2-oxo acid dehydrogenase complex; 1.
DR   SUPFAM; SSF51230; Single hybrid motif; 1.
DR   PROSITE; PS50968; BIOTINYL_LIPOYL; 1.
DR   PROSITE; PS00189; LIPOYL; 1.
DR   PROSITE; PS51826; PSBD; 1.
PE   3: Inferred from homology;
KW   Acyltransferase; Lipoyl; Reference proteome; Transferase;
KW   Tricarboxylic acid cycle.
FT   CHAIN           1..409
FT                   /note="Dihydrolipoyllysine-residue succinyltransferase
FT                   component of 2-oxoglutarate dehydrogenase complex"
FT                   /id="PRO_0000162264"
FT   DOMAIN          2..77
FT                   /note="Lipoyl-binding"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01066"
FT   DOMAIN          114..151
FT                   /note="Peripheral subunit-binding (PSBD)"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01170"
FT   REGION          83..114
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   COMPBIAS        83..107
FT                   /note="Polar residues"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   ACT_SITE        380
FT                   /evidence="ECO:0000250|UniProtKB:P0AFG6"
FT   ACT_SITE        384
FT                   /evidence="ECO:0000250|UniProtKB:P0AFG6"
FT   MOD_RES         43
FT                   /note="N6-lipoyllysine"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01066"
SQ   SEQUENCE   409 AA;  45163 MW;  3FBF62BC17433839 CRC64;
     MAIEILVPDL PESVADATVA TWHKKLGDTV KRDEVIVEIE TDKVVLEVPA LSDGVLAEVV
     QAEGETVVSK QLLGKISTAQ EGDVSSATLK ATNEPTPSDR QNAAIENSHN HNADQSPVIR
     RLLAEHDLQA DQIQGSGVGG RLTREDIERE IAKRQAQQVK QEAATEQNTI STVAYSARSE
     KRVPMTRLRK RIAERLLEAK NSTAMLTTFN EVDMQPIMTL RKTYGEKFEK QHSVRLGFMS
     FYIKAVVEAL KRYPEVNASI DGDDVVYHNY FDISIAVSTP RGLVTPVLRD CDKLSMAEIE
     KQIKALAEKG RDGKLTVEDL TGGNFTITNG GVFGSLMSTP IINPPQSAIL GMHAIKERPI
     ALNGQVVIRP MMYLALSYDH RLIDGRESVG FLVTIKELLE DPTRLLLEI
//