ID   FOLD2_NOCSJ             Reviewed;         283 AA.
AC   A1SMP7;
DT   02-OCT-2007, integrated into UniProtKB/Swiss-Prot.
DT   06-FEB-2007, sequence version 1.
DT   04-NOV-2026, entry version 99.
DE   RecName: Full=Bifunctional protein FolD 2 {ECO:0000255|HAMAP-Rule:MF_01576};
DE   Includes:
DE     RecName: Full=Methylenetetrahydrofolate dehydrogenase {ECO:0000255|HAMAP-Rule:MF_01576};
DE              EC=1.5.1.5 {ECO:0000255|HAMAP-Rule:MF_01576};
DE   Includes:
DE     RecName: Full=Methenyltetrahydrofolate cyclohydrolase {ECO:0000255|HAMAP-Rule:MF_01576};
DE              EC=3.5.4.9 {ECO:0000255|HAMAP-Rule:MF_01576};
GN   Name=folD2 {ECO:0000255|HAMAP-Rule:MF_01576};
GN   OrderedLocusNames=Noca_3582;
OS   Nocardioides sp. (strain ATCC BAA-499 / JS614).
OC   Bacteria; Bacillati; Actinomycetota; Actinomycetes; Propionibacteriales;
OC   Nocardioidaceae; Nocardioides.
OX   NCBI_TaxID=196162;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC BAA-499 / JS614;
RA   Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C.,
RA   Glavina del Rio T., Hammon N., Israni S., Dalin E., Tice H., Pitluck S.,
RA   Thompson L.S., Brettin T., Bruce D., Han C., Tapia R., Schmutz J.,
RA   Larimer F., Land M., Hauser L., Kyrpides N., Kim E., Mattes T., Gossett J.,
RA   Richardson P.;
RT   "Complete sequence of chromosome 1 of Nocardioides sp. JS614.";
RL   Submitted (DEC-2006) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Catalyzes the oxidation of 5,10-methylenetetrahydrofolate to
CC       5,10-methenyltetrahydrofolate and then the hydrolysis of 5,10-
CC       methenyltetrahydrofolate to 10-formyltetrahydrofolate.
CC       {ECO:0000255|HAMAP-Rule:MF_01576}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=(6R)-5,10-methylene-5,6,7,8-tetrahydrofolate + NADP(+) = (6R)-
CC         5,10-methenyltetrahydrofolate + NADPH; Xref=Rhea:RHEA:22812,
CC         ChEBI:CHEBI:15636, ChEBI:CHEBI:57455, ChEBI:CHEBI:57783,
CC         ChEBI:CHEBI:58349; EC=1.5.1.5; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_01576};
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=(6R)-5,10-methenyltetrahydrofolate + H2O = (6R)-10-
CC         formyltetrahydrofolate + H(+); Xref=Rhea:RHEA:23700,
CC         ChEBI:CHEBI:15377, ChEBI:CHEBI:15378, ChEBI:CHEBI:57455,
CC         ChEBI:CHEBI:195366; EC=3.5.4.9; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_01576};
CC   -!- PATHWAY: One-carbon metabolism; tetrahydrofolate interconversion.
CC       {ECO:0000255|HAMAP-Rule:MF_01576}.
CC   -!- SUBUNIT: Homodimer. {ECO:0000255|HAMAP-Rule:MF_01576}.
CC   -!- SIMILARITY: Belongs to the tetrahydrofolate
CC       dehydrogenase/cyclohydrolase family. {ECO:0000255|HAMAP-Rule:MF_01576}.
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DR   EMBL; CP000509; ABL83082.1; -; Genomic_DNA.
DR   RefSeq; WP_011757013.1; NC_008699.1.
DR   AlphaFoldDB; A1SMP7; -.
DR   SMR; A1SMP7; -.
DR   STRING; 196162.Noca_3582; -.
DR   KEGG; nca:Noca_3582; -.
DR   eggNOG; COG0190; Bacteria.
DR   HOGENOM; CLU_034045_3_0_11; -.
DR   OMA; AADVWDK; -.
DR   OrthoDB; 9803580at2; -.
DR   UniPathway; UPA00193; -.
DR   GO; GO:0005829; C:cytosol; IEA:TreeGrafter.
DR   GO; GO:0004477; F:methenyltetrahydrofolate cyclohydrolase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0004488; F:methylenetetrahydrofolate dehydrogenase (NADP+) activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0035999; P:tetrahydrofolate interconversion; IEA:UniProtKB-UniRule.
DR   CDD; cd01080; NAD_bind_m-THF_DH_Cyclohyd; 1.
DR   FunFam; 3.40.50.720:FF:000094; Bifunctional protein FolD; 1.
DR   FunFam; 3.40.50.10860:FF:000005; C-1-tetrahydrofolate synthase, cytoplasmic, putative; 1.
DR   Gene3D; 3.40.50.10860; Leucine Dehydrogenase, chain A, domain 1; 1.
DR   Gene3D; 3.40.50.720; NAD(P)-binding Rossmann-like Domain; 1.
DR   HAMAP; MF_01576; THF_DHG_CYH; 1.
DR   InterPro; IPR046346; Aminoacid_DH-like_N_sf.
DR   InterPro; IPR036291; NAD(P)-bd_dom_sf.
DR   InterPro; IPR000672; THF_DH/CycHdrlase.
DR   InterPro; IPR020630; THF_DH/CycHdrlase_cat_dom.
DR   InterPro; IPR020631; THF_DH/CycHdrlase_NAD-bd_dom.
DR   NCBIfam; NF010789; PRK14193.1; 1.
DR   PANTHER; PTHR48099:SF5; C-1-TETRAHYDROFOLATE SYNTHASE, CYTOPLASMIC; 1.
DR   PANTHER; PTHR48099; C-1-TETRAHYDROFOLATE SYNTHASE, CYTOPLASMIC-RELATED; 1.
DR   Pfam; PF00763; THF_DHG_CYH; 1.
DR   Pfam; PF02882; THF_DHG_CYH_C; 1.
DR   PRINTS; PR00085; THFDHDRGNASE.
DR   SUPFAM; SSF53223; Aminoacid dehydrogenase-like, N-terminal domain; 1.
DR   SUPFAM; SSF51735; NAD(P)-binding Rossmann-fold domains; 1.
PE   3: Inferred from homology;
KW   Amino-acid biosynthesis; Histidine biosynthesis; Hydrolase;
KW   Methionine biosynthesis; Multifunctional enzyme; NADP;
KW   One-carbon metabolism; Oxidoreductase; Purine biosynthesis.
FT   CHAIN           1..283
FT                   /note="Bifunctional protein FolD 2"
FT                   /id="PRO_0000305854"
FT   BINDING         165..167
FT                   /ligand="NADP(+)"
FT                   /ligand_id="ChEBI:CHEBI:58349"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01576"
FT   BINDING         192
FT                   /ligand="NADP(+)"
FT                   /ligand_id="ChEBI:CHEBI:58349"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01576"
FT   BINDING         233
FT                   /ligand="NADP(+)"
FT                   /ligand_id="ChEBI:CHEBI:58349"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01576"
SQ   SEQUENCE   283 AA;  29369 MW;  F66FF1AEAD723F64 CRC64;
     MTAQKLDGTA TAAAIKGELT TRVAALHERG IRPGLGTILV GDDPGSRWYV NGKHKDCAEV
     GIESIRIDLP ATATQDEIED AVRVLNDDPA CTGYIVQLPL PKGRDENRVL GLIDPAKDAD
     GLHPTNLGWL VLGKAAPLPC TPNGIVELLR RHGVEIAGAE VTVVGRGVTV GRPLGLLLTR
     RSENATVTLC HTGTRDLAAH VRGADIVVAA AGVPGIVTGA MVKPGAAVLD VGVSRVDGKL
     AGDVAPEVWD VARWVSPNPG GVGPMTRAML LSNIVAMAEQ TDS
//