ID   METF_BUCAI              Reviewed;         292 AA.
AC   P57154;
DT   01-DEC-2000, integrated into UniProtKB/Swiss-Prot.
DT   01-DEC-2000, sequence version 1.
DT   03-AUG-2022, entry version 107.
DE   RecName: Full=5,10-methylenetetrahydrofolate reductase;
DE            EC=1.5.1.20;
GN   Name=metF; OrderedLocusNames=BU046;
OS   Buchnera aphidicola subsp. Acyrthosiphon pisum (strain APS) (Acyrthosiphon
OS   pisum symbiotic bacterium).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC   Erwiniaceae; Buchnera.
OX   NCBI_TaxID=107806;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=APS;
RX   PubMed=10993077; DOI=10.1038/35024074;
RA   Shigenobu S., Watanabe H., Hattori M., Sakaki Y., Ishikawa H.;
RT   "Genome sequence of the endocellular bacterial symbiont of aphids Buchnera
RT   sp. APS.";
RL   Nature 407:81-86(2000).
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=(6S)-5-methyl-5,6,7,8-tetrahydrofolate + NADP(+) = (6R)-5,10-
CC         methylene-5,6,7,8-tetrahydrofolate + H(+) + NADPH;
CC         Xref=Rhea:RHEA:19817, ChEBI:CHEBI:15378, ChEBI:CHEBI:15636,
CC         ChEBI:CHEBI:18608, ChEBI:CHEBI:57783, ChEBI:CHEBI:58349; EC=1.5.1.20;
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=(6S)-5-methyl-5,6,7,8-tetrahydrofolate + NAD(+) = (6R)-5,10-
CC         methylene-5,6,7,8-tetrahydrofolate + H(+) + NADH;
CC         Xref=Rhea:RHEA:19821, ChEBI:CHEBI:15378, ChEBI:CHEBI:15636,
CC         ChEBI:CHEBI:18608, ChEBI:CHEBI:57540, ChEBI:CHEBI:57945; EC=1.5.1.20;
CC   -!- COFACTOR:
CC       Name=FAD; Xref=ChEBI:CHEBI:57692; Evidence={ECO:0000250};
CC   -!- PATHWAY: One-carbon metabolism; tetrahydrofolate interconversion.
CC   -!- SIMILARITY: Belongs to the methylenetetrahydrofolate reductase family.
CC       {ECO:0000305}.
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DR   EMBL; BA000003; BAB12769.1; -; Genomic_DNA.
DR   RefSeq; NP_239883.1; NC_002528.1.
DR   RefSeq; WP_010895916.1; NC_002528.1.
DR   AlphaFoldDB; P57154; -.
DR   SMR; P57154; -.
DR   STRING; 107806.10038734; -.
DR   EnsemblBacteria; BAB12769; BAB12769; BAB12769.
DR   KEGG; buc:BU046; -.
DR   PATRIC; fig|107806.10.peg.55; -.
DR   eggNOG; COG0685; Bacteria.
DR   HOGENOM; CLU_025841_0_0_6; -.
DR   OMA; EMHPQAR; -.
DR   UniPathway; UPA00193; -.
DR   Proteomes; UP000001806; Chromosome.
DR   GO; GO:0005829; C:cytosol; IEA:InterPro.
DR   GO; GO:0106312; F:methylenetetrahydrofolate reductase NADH activity; IEA:RHEA.
DR   GO; GO:0106313; F:methylenetetrahydrofolate reductase NADPH activity; IEA:RHEA.
DR   GO; GO:0009086; P:methionine biosynthetic process; IEA:UniProtKB-KW.
DR   GO; GO:0035999; P:tetrahydrofolate interconversion; IEA:UniProtKB-UniPathway.
DR   CDD; cd00537; MTHFR; 1.
DR   InterPro; IPR029041; FAD-linked_oxidoreductase-like.
DR   InterPro; IPR003171; Mehydrof_redctse-like.
DR   InterPro; IPR004620; MTHF_reductase_bac.
DR   Pfam; PF02219; MTHFR; 1.
DR   SUPFAM; SSF51730; SSF51730; 1.
DR   TIGRFAMs; TIGR00676; fadh2; 1.
PE   3: Inferred from homology;
KW   Amino-acid biosynthesis; FAD; Flavoprotein; Methionine biosynthesis; NAD;
KW   NADP; Oxidoreductase; Reference proteome.
FT   CHAIN           1..292
FT                   /note="5,10-methylenetetrahydrofolate reductase"
FT                   /id="PRO_0000190258"
FT   ACT_SITE        28
FT                   /note="Proton donor/acceptor"
FT                   /evidence="ECO:0000250"
FT   BINDING         28..33
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000250"
FT   BINDING         59..62
FT                   /ligand="FAD"
FT                   /ligand_id="ChEBI:CHEBI:57692"
FT                   /evidence="ECO:0000250"
FT   BINDING         59..60
FT                   /ligand="NAD(+)"
FT                   /ligand_id="ChEBI:CHEBI:57540"
FT                   /evidence="ECO:0000250"
FT   BINDING         88
FT                   /ligand="FAD"
FT                   /ligand_id="ChEBI:CHEBI:57692"
FT                   /evidence="ECO:0000250"
FT   BINDING         118..120
FT                   /ligand="FAD"
FT                   /ligand_id="ChEBI:CHEBI:57692"
FT                   /evidence="ECO:0000250"
FT   BINDING         120
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         131..132
FT                   /ligand="FAD"
FT                   /ligand_id="ChEBI:CHEBI:57692"
FT                   /evidence="ECO:0000250"
FT   BINDING         152
FT                   /ligand="FAD"
FT                   /ligand_id="ChEBI:CHEBI:57692"
FT                   /evidence="ECO:0000250"
FT   BINDING         156..159
FT                   /ligand="FAD"
FT                   /ligand_id="ChEBI:CHEBI:57692"
FT                   /evidence="ECO:0000250"
FT   BINDING         165..172
FT                   /ligand="FAD"
FT                   /ligand_id="ChEBI:CHEBI:57692"
FT                   /evidence="ECO:0000250"
FT   BINDING         183
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         223
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         275
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   292 AA;  33730 MW;  1D2A9E1B4D6E0DA9 CRC64;
     MKNYSQYHQD IMNQKLENIR NNIQCSFEFF PPKNSFLEEN LWSTVNRLSL LKPKFFSVTY
     GANTGEREKT YDTVQKIYKK TGIITAAHLT CIDSTPHKLK EIAYNYWNSG IKSIVALRGD
     TLEKDYRHTM YAVDLVLLLK KIADFDISVA AYPELHPESK NVKSDILNLK KKVDAGASRA
     ITQFFFNIES YLRFRDNCIK NKINIDIIPG ILPVCNFQKL KRFSSMTNVK IPKWMLDMFN
     GLDDDIFTQK IIGSSIAIDM VKKLSCEGVK NFHFYTLNQS DITYSICHIL GL