ID B2R8A9_HUMAN Unreviewed; 445 AA.
AC B2R8A9;
DT 01-JUL-2008, integrated into UniProtKB/TrEMBL.
DT 01-JUL-2008, sequence version 1.
DT 27-MAR-2024, entry version 64.
DE RecName: Full=2-oxoisovalerate dehydrogenase subunit alpha {ECO:0000256|RuleBase:RU365014};
DE EC=1.2.4.4 {ECO:0000256|RuleBase:RU365014};
DE AltName: Full=Branched-chain alpha-keto acid dehydrogenase E1 component alpha chain {ECO:0000256|RuleBase:RU365014};
OS Homo sapiens (Human).
OC Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae;
OC Homo.
OX NCBI_TaxID=9606 {ECO:0000313|EMBL:BAG36106.1};
RN [1] {ECO:0000313|EMBL:BAG36106.1}
RP NUCLEOTIDE SEQUENCE.
RC TISSUE=Small intestine {ECO:0000313|EMBL:BAG36106.1};
RA Wakamatsu A., Yamamoto J., Kimura K., Kaida T., Tsuchiya K., Iida Y.,
RA Takayama Y., Murakawa K., Kanehori K., Andoh T., Kagawa N., Sato R.,
RA Kawamura Y., Tanaka S., Kisu Y., Sugano S., Goshima N., Nomura N.,
RA Isogai T.;
RT "NEDO functional analysis of protein and research application project.";
RL Submitted (JAN-2008) to the EMBL/GenBank/DDBJ databases.
CC -!- FUNCTION: Together with BCKDHB forms the heterotetrameric E1 subunit of
CC the mitochondrial branched-chain alpha-ketoacid dehydrogenase (BCKD)
CC complex. The BCKD complex catalyzes the multi-step oxidative
CC decarboxylation of alpha-ketoacids derived from the branched-chain
CC amino-acids valine, leucine and isoleucine producing CO2 and acyl-CoA
CC which is subsequently utilized to produce energy. The E1 subunit
CC catalyzes the first step with the decarboxylation of the alpha-ketoacid
CC forming an enzyme-product intermediate. A reductive acylation mediated
CC by the lipoylamide cofactor of E2 extracts the acyl group from the E1
CC active site for the next step of the reaction.
CC {ECO:0000256|ARBA:ARBA00037052, ECO:0000256|RuleBase:RU365014}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=3-methyl-2-oxobutanoate + H(+) + N(6)-[(R)-lipoyl]-L-lysyl-
CC [dihydrolipoyllysine-residue (2-methylpropanoyl)transferase] = CO2 +
CC N(6)-[(R)-S(8)-2-methylpropanoyldihydrolipoyl]-L-lysyl-
CC [dihydrolipoyllysine-residue (2-methylpropanoyl)transferase];
CC Xref=Rhea:RHEA:13457, Rhea:RHEA-COMP:10488, Rhea:RHEA-COMP:10489,
CC ChEBI:CHEBI:11851, ChEBI:CHEBI:15378, ChEBI:CHEBI:16526,
CC ChEBI:CHEBI:83099, ChEBI:CHEBI:83142; EC=1.2.4.4;
CC Evidence={ECO:0000256|ARBA:ARBA00043720};
CC PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:13458;
CC Evidence={ECO:0000256|ARBA:ARBA00043720};
CC -!- COFACTOR:
CC Name=thiamine diphosphate; Xref=ChEBI:CHEBI:58937;
CC Evidence={ECO:0000256|RuleBase:RU365014};
CC -!- SIMILARITY: Belongs to the BCKDHA family.
CC {ECO:0000256|ARBA:ARBA00008646, ECO:0000256|RuleBase:RU365014}.
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DR EMBL; AK313300; BAG36106.1; -; mRNA.
DR AlphaFoldDB; B2R8A9; -.
DR SMR; B2R8A9; -.
DR PeptideAtlas; B2R8A9; -.
DR GO; GO:0005759; C:mitochondrial matrix; IEA:UniProt.
DR GO; GO:0003863; F:3-methyl-2-oxobutanoate dehydrogenase (2-methylpropanoyl-transferring) activity; IEA:UniProtKB-EC.
DR CDD; cd02000; TPP_E1_PDC_ADC_BCADC; 1.
DR Gene3D; 3.40.50.970; -; 1.
DR InterPro; IPR001017; DH_E1.
DR InterPro; IPR029061; THDP-binding.
DR PANTHER; PTHR43380; 2-OXOISOVALERATE DEHYDROGENASE SUBUNIT ALPHA, MITOCHONDRIAL; 1.
DR PANTHER; PTHR43380:SF1; 2-OXOISOVALERATE DEHYDROGENASE SUBUNIT ALPHA, MITOCHONDRIAL; 1.
DR Pfam; PF00676; E1_dh; 1.
DR SUPFAM; SSF52518; Thiamin diphosphate-binding fold (THDP-binding); 1.
PE 2: Evidence at transcript level;
KW Oxidoreductase {ECO:0000256|ARBA:ARBA00023002,
KW ECO:0000256|RuleBase:RU365014}; Potassium {ECO:0000256|ARBA:ARBA00022958};
KW Thiamine pyrophosphate {ECO:0000256|RuleBase:RU365014};
KW Transit peptide {ECO:0000256|ARBA:ARBA00022946}.
FT DOMAIN 106..405
FT /note="Dehydrogenase E1 component"
FT /evidence="ECO:0000259|Pfam:PF00676"
FT REGION 33..52
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT COMPBIAS 37..51
FT /note="Polar residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ SEQUENCE 445 AA; 50470 MW; 10FBD6589A6590CB CRC64;
MAVAIAAARV WRLNRGLSQA ALLLLRQPGA RGLARSHPPR QQQQFSSLDD KPQFPGASAE
FIDKLEFIQP NVISGIPIYR VMDRQGQIIN PSEDPHLPKE KVLKLYKSMT LLNTMDRILY
ESQRQGRISF YMTNYGEEGT HVGSAAALDN TDLVFGQYRE AGVLMYRDYP LELFMAQCYG
NISDLGKGRQ MPVHYGCKER HFVTISSPLA TQIPQAVGAA YAAKRANANR VVICYFGEGA
ASEGDAHAGF NFAATLECPI IFFCRNNGYA ISTPTSEQYR GDGIAARGPG YGIMSIRVDG
NDVFAVYNAT KEARRRAVAE NQPFLIEAMT YRIGHHSTSD DSSAYRSVDE VNYWDKQDHP
ISRLRHYLLS QGWWDEKQEK AWRKQSRRKV MEAFEQAERK PKPNPNLLFS DVYQEMPAQL
RKQQESLARH LQTYGEHYPL DHFDK
//
