ID   PANB_CENSY              Reviewed;         262 AA.
AC   A0RXQ5;
DT   24-JUL-2007, integrated into UniProtKB/Swiss-Prot.
DT   09-JAN-2007, sequence version 1.
DT   03-AUG-2022, entry version 74.
DE   RecName: Full=3-methyl-2-oxobutanoate hydroxymethyltransferase {ECO:0000255|HAMAP-Rule:MF_00156};
DE            EC=2.1.2.11 {ECO:0000255|HAMAP-Rule:MF_00156};
DE   AltName: Full=Ketopantoate hydroxymethyltransferase {ECO:0000255|HAMAP-Rule:MF_00156};
DE            Short=KPHMT {ECO:0000255|HAMAP-Rule:MF_00156};
GN   Name=panB {ECO:0000255|HAMAP-Rule:MF_00156}; OrderedLocusNames=CENSYa_1500;
OS   Cenarchaeum symbiosum (strain A).
OC   Archaea; Thaumarchaeota; Cenarchaeales; Cenarchaeaceae; Cenarchaeum.
OX   NCBI_TaxID=414004;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=A;
RX   PubMed=17114289; DOI=10.1073/pnas.0608549103;
RA   Hallam S.J., Konstantinidis K.T., Putnam N., Schleper C., Watanabe Y.,
RA   Sugahara J., Preston C., de la Torre J., Richardson P.M., DeLong E.F.;
RT   "Genomic analysis of the uncultivated marine crenarchaeote Cenarchaeum
RT   symbiosum.";
RL   Proc. Natl. Acad. Sci. U.S.A. 103:18296-18301(2006).
CC   -!- FUNCTION: Catalyzes the reversible reaction in which hydroxymethyl
CC       group from 5,10-methylenetetrahydrofolate is transferred onto alpha-
CC       ketoisovalerate to form ketopantoate. {ECO:0000255|HAMAP-
CC       Rule:MF_00156}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=(6R)-5,10-methylene-5,6,7,8-tetrahydrofolate + 3-methyl-2-
CC         oxobutanoate + H2O = (6S)-5,6,7,8-tetrahydrofolate + 2-
CC         dehydropantoate; Xref=Rhea:RHEA:11824, ChEBI:CHEBI:11561,
CC         ChEBI:CHEBI:11851, ChEBI:CHEBI:15377, ChEBI:CHEBI:15636,
CC         ChEBI:CHEBI:57453; EC=2.1.2.11; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_00156};
CC   -!- COFACTOR:
CC       Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00156};
CC       Note=Binds 1 Mg(2+) ion per subunit. {ECO:0000255|HAMAP-Rule:MF_00156};
CC   -!- PATHWAY: Cofactor biosynthesis; coenzyme A biosynthesis.
CC       {ECO:0000255|HAMAP-Rule:MF_00156}.
CC   -!- SUBUNIT: Homodecamer; pentamer of dimers. {ECO:0000255|HAMAP-
CC       Rule:MF_00156}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_00156}.
CC   -!- SIMILARITY: Belongs to the PanB family. {ECO:0000255|HAMAP-
CC       Rule:MF_00156}.
CC   ---------------------------------------------------------------------------
CC   Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC   Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC   ---------------------------------------------------------------------------
DR   EMBL; DP000238; ABK78122.1; -; Genomic_DNA.
DR   AlphaFoldDB; A0RXQ5; -.
DR   SMR; A0RXQ5; -.
DR   STRING; 414004.CENSYa_1500; -.
DR   PRIDE; A0RXQ5; -.
DR   EnsemblBacteria; ABK78122; ABK78122; CENSYa_1500.
DR   KEGG; csy:CENSYa_1500; -.
DR   PATRIC; fig|414004.10.peg.1375; -.
DR   HOGENOM; CLU_036645_1_0_2; -.
DR   OMA; VLVWTDM; -.
DR   UniPathway; UPA00241; -.
DR   Proteomes; UP000000758; Chromosome.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0003864; F:3-methyl-2-oxobutanoate hydroxymethyltransferase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0015937; P:coenzyme A biosynthetic process; IEA:UniProtKB-UniRule.
DR   GO; GO:0015940; P:pantothenate biosynthetic process; IEA:InterPro.
DR   CDD; cd06557; KPHMT-like; 1.
DR   Gene3D; 3.20.20.60; -; 1.
DR   HAMAP; MF_00156; PanB; 1.
DR   InterPro; IPR003700; Pantoate_hydroxy_MeTrfase.
DR   InterPro; IPR015813; Pyrv/PenolPyrv_Kinase-like_dom.
DR   InterPro; IPR040442; Pyrv_Kinase-like_dom_sf.
DR   PANTHER; PTHR20881; PTHR20881; 1.
DR   Pfam; PF02548; Pantoate_transf; 1.
DR   PIRSF; PIRSF000388; Pantoate_hydroxy_MeTrfase; 1.
DR   SUPFAM; SSF51621; SSF51621; 1.
DR   TIGRFAMs; TIGR00222; panB; 1.
PE   3: Inferred from homology;
KW   Coenzyme A biosynthesis; Cytoplasm; Magnesium; Metal-binding;
KW   Reference proteome; Transferase.
FT   CHAIN           1..262
FT                   /note="3-methyl-2-oxobutanoate hydroxymethyltransferase"
FT                   /id="PRO_0000297420"
FT   ACT_SITE        168
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00156"
FT   BINDING         31..32
FT                   /ligand="3-methyl-2-oxobutanoate"
FT                   /ligand_id="ChEBI:CHEBI:11851"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00156"
FT   BINDING         31
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00156"
FT   BINDING         70
FT                   /ligand="3-methyl-2-oxobutanoate"
FT                   /ligand_id="ChEBI:CHEBI:11851"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00156"
FT   BINDING         70
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00156"
FT   BINDING         99
FT                   /ligand="3-methyl-2-oxobutanoate"
FT                   /ligand_id="ChEBI:CHEBI:11851"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00156"
FT   BINDING         101
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00156"
SQ   SEQUENCE   262 AA;  27197 MW;  790698AA20BCE201 CRC64;
     MKGSEKITVV ACYDYSMAAL CDGADMLLVG DSAGMVVLGY DSTTRVTMDE MCLFTGAVSR
     GRKDSMVVGD LPFMSYQACT ADAIRNSGRL VRAGADAVKL EGGAAVADAV RGVTGAGIPV
     MGHIGLLPQT AALSGGYRVQ GRTRESALRL AEDAKALEEA GAFAIVLEMV AEEAARMVTK
     SVGVPTIGIG SGAGCDGQVL VLHDMLGLYG RFRPKFAKVY ADLSGEVAGA VAGFKAEVES
     SQFPRPENSF YMDAGEADGL DR