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Database: UniProt
Entry: A0A495X120_9PSEU
LinkDB: A0A495X120_9PSEU
Original site: A0A495X120_9PSEU 
ID   A0A495X120_9PSEU        Unreviewed;      1204 AA.
AC   A0A495X120;
DT   05-JUN-2019, integrated into UniProtKB/TrEMBL.
DT   05-JUN-2019, sequence version 1.
DT   13-SEP-2023, entry version 20.
DE   RecName: Full=Methionine synthase {ECO:0000256|ARBA:ARBA00013998, ECO:0000256|PIRNR:PIRNR000381};
DE            EC=2.1.1.13 {ECO:0000256|ARBA:ARBA00012032, ECO:0000256|PIRNR:PIRNR000381};
DE   AltName: Full=5-methyltetrahydrofolate--homocysteine methyltransferase {ECO:0000256|ARBA:ARBA00031040, ECO:0000256|PIRNR:PIRNR000381};
GN   ORFNames=DFJ66_0712 {ECO:0000313|EMBL:RKT67537.1};
OS   Saccharothrix variisporea.
OC   Bacteria; Actinomycetota; Actinomycetes; Pseudonocardiales;
OC   Pseudonocardiaceae; Saccharothrix.
OX   NCBI_TaxID=543527 {ECO:0000313|EMBL:RKT67537.1, ECO:0000313|Proteomes:UP000272729};
RN   [1] {ECO:0000313|EMBL:RKT67537.1, ECO:0000313|Proteomes:UP000272729}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=DSM 43911 {ECO:0000313|EMBL:RKT67537.1,
RC   ECO:0000313|Proteomes:UP000272729};
RA   Klenk H.-P.;
RT   "Sequencing the genomes of 1000 actinobacteria strains.";
RL   Submitted (OCT-2018) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Catalyzes the transfer of a methyl group from methyl-
CC       cobalamin to homocysteine, yielding enzyme-bound cob(I)alamin and
CC       methionine. Subsequently, remethylates the cofactor using
CC       methyltetrahydrofolate. {ECO:0000256|ARBA:ARBA00025552,
CC       ECO:0000256|PIRNR:PIRNR000381}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=(6S)-5-methyl-5,6,7,8-tetrahydrofolate + L-homocysteine =
CC         (6S)-5,6,7,8-tetrahydrofolate + L-methionine; Xref=Rhea:RHEA:11172,
CC         ChEBI:CHEBI:18608, ChEBI:CHEBI:57453, ChEBI:CHEBI:57844,
CC         ChEBI:CHEBI:58199; EC=2.1.1.13;
CC         Evidence={ECO:0000256|ARBA:ARBA00001700,
CC         ECO:0000256|PIRNR:PIRNR000381};
CC   -!- COFACTOR:
CC       Name=Zn(2+); Xref=ChEBI:CHEBI:29105;
CC         Evidence={ECO:0000256|ARBA:ARBA00001947,
CC         ECO:0000256|PIRNR:PIRNR000381, ECO:0000256|PROSITE-ProRule:PRU00333};
CC   -!- COFACTOR:
CC       Name=methylcob(III)alamin; Xref=ChEBI:CHEBI:28115;
CC         Evidence={ECO:0000256|ARBA:ARBA00001956,
CC         ECO:0000256|PIRNR:PIRNR000381, ECO:0000256|PIRSR:PIRSR000381-1};
CC   -!- PATHWAY: Amino-acid biosynthesis; L-methionine biosynthesis via de novo
CC       pathway; L-methionine from L-homocysteine (MetH route): step 1/1.
CC       {ECO:0000256|ARBA:ARBA00005178, ECO:0000256|PIRNR:PIRNR000381}.
CC   -!- DOMAIN: Modular enzyme with four functionally distinct domains. The
CC       isolated Hcy-binding domain catalyzes methyl transfer from free
CC       methylcobalamin to homocysteine. The Hcy-binding domain in association
CC       with the pterin-binding domain catalyzes the methylation of
CC       cob(I)alamin by methyltetrahydrofolate and the methylation of
CC       homocysteine. The B12-binding domain binds the cofactor. The AdoMet
CC       activation domain binds S-adenosyl-L-methionine. Under aerobic
CC       conditions cob(I)alamin can be converted to inactive cob(II)alamin.
CC       Reductive methylation by S-adenosyl-L-methionine and flavodoxin
CC       regenerates methylcobalamin. {ECO:0000256|PIRNR:PIRNR000381}.
CC   -!- SIMILARITY: Belongs to the vitamin-B12 dependent methionine synthase
CC       family. {ECO:0000256|ARBA:ARBA00010398}.
CC   -!- CAUTION: The sequence shown here is derived from an EMBL/GenBank/DDBJ
CC       whole genome shotgun (WGS) entry which is preliminary data.
CC       {ECO:0000313|EMBL:RKT67537.1}.
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DR   EMBL; RBXR01000001; RKT67537.1; -; Genomic_DNA.
DR   AlphaFoldDB; A0A495X120; -.
DR   OrthoDB; 9803687at2; -.
DR   UniPathway; UPA00051; UER00081.
DR   Proteomes; UP000272729; Unassembled WGS sequence.
DR   GO; GO:0031419; F:cobalamin binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0008705; F:methionine synthase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0008270; F:zinc ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0032259; P:methylation; IEA:UniProtKB-KW.
DR   GO; GO:0042558; P:pteridine-containing compound metabolic process; IEA:InterPro.
DR   CDD; cd02069; methionine_synthase_B12_BD; 1.
DR   CDD; cd00740; MeTr; 1.
DR   Gene3D; 3.40.50.280; Cobalamin-binding domain; 1.
DR   Gene3D; 1.10.288.10; Cobalamin-dependent Methionine Synthase, domain 2; 1.
DR   Gene3D; 3.20.20.20; Dihydropteroate synthase-like; 1.
DR   Gene3D; 3.20.20.330; Homocysteine-binding-like domain; 1.
DR   Gene3D; 1.10.1240.10; Methionine synthase domain; 1.
DR   Gene3D; 3.10.196.10; Vitamin B12-dependent methionine synthase, activation domain; 1.
DR   InterPro; IPR003759; Cbl-bd_cap.
DR   InterPro; IPR006158; Cobalamin-bd.
DR   InterPro; IPR036724; Cobalamin-bd_sf.
DR   InterPro; IPR011005; Dihydropteroate_synth-like.
DR   InterPro; IPR003726; HCY_dom.
DR   InterPro; IPR036589; HCY_dom_sf.
DR   InterPro; IPR033706; Met_synthase_B12-bd.
DR   InterPro; IPR011822; MetH.
DR   InterPro; IPR036594; Meth_synthase_dom.
DR   InterPro; IPR000489; Pterin-binding_dom.
DR   InterPro; IPR004223; VitB12-dep_Met_synth_activ_dom.
DR   InterPro; IPR037010; VitB12-dep_Met_synth_activ_sf.
DR   NCBIfam; TIGR02082; metH; 1.
DR   PANTHER; PTHR45833; METHIONINE SYNTHASE; 1.
DR   PANTHER; PTHR45833:SF1; METHIONINE SYNTHASE; 1.
DR   Pfam; PF02310; B12-binding; 1.
DR   Pfam; PF02607; B12-binding_2; 1.
DR   Pfam; PF02965; Met_synt_B12; 1.
DR   Pfam; PF00809; Pterin_bind; 1.
DR   Pfam; PF02574; S-methyl_trans; 1.
DR   PIRSF; PIRSF000381; MetH; 1.
DR   SMART; SM01018; B12-binding_2; 1.
DR   SUPFAM; SSF52242; Cobalamin (vitamin B12)-binding domain; 1.
DR   SUPFAM; SSF51717; Dihydropteroate synthetase-like; 1.
DR   SUPFAM; SSF82282; Homocysteine S-methyltransferase; 1.
DR   SUPFAM; SSF56507; Methionine synthase activation domain-like; 1.
DR   SUPFAM; SSF47644; Methionine synthase domain; 1.
DR   PROSITE; PS50974; ADOMET_ACTIVATION; 1.
DR   PROSITE; PS51332; B12_BINDING; 1.
DR   PROSITE; PS51337; B12_BINDING_NTER; 1.
DR   PROSITE; PS50970; HCY; 1.
DR   PROSITE; PS50972; PTERIN_BINDING; 1.
PE   3: Inferred from homology;
KW   Amino-acid biosynthesis {ECO:0000256|ARBA:ARBA00022605,
KW   ECO:0000256|PIRNR:PIRNR000381};
KW   Cobalamin {ECO:0000256|ARBA:ARBA00022628, ECO:0000256|PIRNR:PIRNR000381};
KW   Cobalt {ECO:0000256|ARBA:ARBA00023285, ECO:0000256|PIRNR:PIRNR000381};
KW   Metal-binding {ECO:0000256|ARBA:ARBA00022723,
KW   ECO:0000256|PIRNR:PIRNR000381};
KW   Methionine biosynthesis {ECO:0000256|ARBA:ARBA00023167,
KW   ECO:0000256|PIRNR:PIRNR000381};
KW   Methyltransferase {ECO:0000256|ARBA:ARBA00022603,
KW   ECO:0000256|PIRNR:PIRNR000381};
KW   Reference proteome {ECO:0000313|Proteomes:UP000272729};
KW   Repeat {ECO:0000256|ARBA:ARBA00022737};
KW   S-adenosyl-L-methionine {ECO:0000256|ARBA:ARBA00022691,
KW   ECO:0000256|PIRNR:PIRNR000381};
KW   Transferase {ECO:0000256|ARBA:ARBA00022679, ECO:0000256|PIRNR:PIRNR000381};
KW   Zinc {ECO:0000256|ARBA:ARBA00022833, ECO:0000256|PIRNR:PIRNR000381}.
FT   DOMAIN          2..313
FT                   /note="Hcy-binding"
FT                   /evidence="ECO:0000259|PROSITE:PS50970"
FT   DOMAIN          345..606
FT                   /note="Pterin-binding"
FT                   /evidence="ECO:0000259|PROSITE:PS50972"
FT   DOMAIN          636..730
FT                   /note="B12-binding N-terminal"
FT                   /evidence="ECO:0000259|PROSITE:PS51337"
FT   DOMAIN          741..876
FT                   /note="B12-binding"
FT                   /evidence="ECO:0000259|PROSITE:PS51332"
FT   DOMAIN          889..1204
FT                   /note="AdoMet activation"
FT                   /evidence="ECO:0000259|PROSITE:PS50974"
FT   BINDING         235
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-1,
FT                   ECO:0000256|PROSITE-ProRule:PRU00333"
FT   BINDING         298
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-1,
FT                   ECO:0000256|PROSITE-ProRule:PRU00333"
FT   BINDING         299
FT                   /ligand="Zn(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29105"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-1,
FT                   ECO:0000256|PROSITE-ProRule:PRU00333"
FT   BINDING         680
FT                   /ligand="methylcob(III)alamin"
FT                   /ligand_id="ChEBI:CHEBI:28115"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT   BINDING         751..755
FT                   /ligand="methylcob(III)alamin"
FT                   /ligand_id="ChEBI:CHEBI:28115"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT   BINDING         754
FT                   /ligand="methylcob(III)alamin"
FT                   /ligand_id="ChEBI:CHEBI:28115"
FT                   /ligand_part="Co"
FT                   /ligand_part_id="ChEBI:CHEBI:27638"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-1"
FT   BINDING         799
FT                   /ligand="methylcob(III)alamin"
FT                   /ligand_id="ChEBI:CHEBI:28115"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT   BINDING         803
FT                   /ligand="methylcob(III)alamin"
FT                   /ligand_id="ChEBI:CHEBI:28115"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT   BINDING         855
FT                   /ligand="methylcob(III)alamin"
FT                   /ligand_id="ChEBI:CHEBI:28115"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT   BINDING         938
FT                   /ligand="S-adenosyl-L-methionine"
FT                   /ligand_id="ChEBI:CHEBI:59789"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT   BINDING         1112
FT                   /ligand="S-adenosyl-L-methionine"
FT                   /ligand_id="ChEBI:CHEBI:59789"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT   BINDING         1166..1167
FT                   /ligand="S-adenosyl-L-methionine"
FT                   /ligand_id="ChEBI:CHEBI:59789"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
SQ   SEQUENCE   1204 AA;  129649 MW;  84BEE1C6ECDDE62A CRC64;
     MSEALRELLD RKVAVLDGAW GTMLQAAGLK PVDYRGDLIA GDHPKDVTGD PDLLNLTRPD
     VILDVHRQYL AAGADITTTN TFTATSIGQA DYGLESLVRE MNVQGAKLAR QAADEVGGKF
     VAGSVGPLNV TLSLSPRVED PAFRAVTFDQ VKASYAEQIA ALAEGGVDLL LVETIFDTLN
     AKAAIAAARE VAPQLPLWIS VTIVDLSGRT LSGQTVEAFW RSIEHAEPLV VGVNCSLGAA
     EMRPHVAELS RIAGAYTAAH PNAGLPNAFG GYDQTPDETA ALLGEFAGSG IVNLVGGCCG
     TTPAHIARIA ESVKGLEPGR KPVSGSKLTA FSGLEPFSIG ADTGFVMIGE RTNVTGSKKF
     RRLIESGDHQ GAVDVALDQV RGGANLLDVN MDADLLDSEE AMTTFLNLIA TEPEIARVPI
     MVDSSRWSVL EAGLKCVQGK GVVNSISLKE GEGPFLEQAR AIRAYGAGVV VMAFDEQGQA
     DTADRKVEIC GRAYDLLVNE VGFPPQDIIF DPNVLAVATG IAEHDEYAKA FIEALPRIKQ
     RCPGARTSGG ISNLSFSFRG NDIIREAMHS AFLFHAVRAG LDMGIVNAGQ LAVYEDIPAD
     LLELVEDVLF NRRPDATDRL VAHAETVKGS GTKRVVDLAW REAPVAERLA HALVHGIVDF
     IEEDTEEARQ QAARPLEVIE GPLMDGMKVV GDLFGSGKMF LPQVVKSARV MKRSVAYLEP
     FMEAEKEKAR AEGRIDTSGG PGKIVLATVK GDVHDIGKNI VGVVLGCNNY EVIDLGVMVP
     SSVIIDTAIA EGASAIGLSG LITPSLDEMV TVASDMQRRG VKLPLLIGGA TTSRQHTAVR
     IAPAFEGTTV HVADASRVVG VVSELLDPDR VEAMDERNRA EQERLRQQHE DRKRVAMLTW
     EQARANREQV AFDELPTPSF TGLRVVEPSL DELRAMIDWQ FFFLAWEVKG KYPAVLDNPV
     AQDLFNDANA LLDEIVAAGS FQARGVLGFW PASSTGDDLV LETESGEVRF PMLRQQTVKP
     DSRPNRSLAD YVAPSGDHLG AFAVGIHGAE DLAARYEAEH DDYRAIMVKT LADRLAEAFA
     EYIHLKARQE WFEPGSEPVL EDLHAEKFRG IRPALGYPAC PDHSQKETLF SLLDARSIGL
     DLTESFAMTP AAAVSGLIFA NPAARYFTVG RIGRDQVADY AKRSGVPVAE VERWLRPNLA
     YDLD
//
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