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Database: UniProt
Entry: A0A3D9HLK4_9FLAO
LinkDB: A0A3D9HLK4_9FLAO
Original site: A0A3D9HLK4_9FLAO 
ID   A0A3D9HLK4_9FLAO        Unreviewed;       890 AA.
AC   A0A3D9HLK4;
DT   16-JAN-2019, integrated into UniProtKB/TrEMBL.
DT   16-JAN-2019, sequence version 1.
DT   24-JAN-2024, entry version 21.
DE   RecName: Full=Methionine synthase {ECO:0000256|PIRNR:PIRNR000381};
DE            EC=2.1.1.13 {ECO:0000256|PIRNR:PIRNR000381};
DE   AltName: Full=5-methyltetrahydrofolate--homocysteine methyltransferase {ECO:0000256|PIRNR:PIRNR000381};
GN   ORFNames=DFQ02_101311 {ECO:0000313|EMBL:RED50285.1};
OS   Seonamhaeicola aphaedonensis.
OC   Bacteria; Bacteroidota; Flavobacteriia; Flavobacteriales;
OC   Flavobacteriaceae.
OX   NCBI_TaxID=1461338 {ECO:0000313|EMBL:RED50285.1, ECO:0000313|Proteomes:UP000256629};
RN   [1] {ECO:0000313|EMBL:RED50285.1, ECO:0000313|Proteomes:UP000256629}
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=CECT 8487 {ECO:0000313|EMBL:RED50285.1,
RC   ECO:0000313|Proteomes:UP000256629};
RA   Whitman W.;
RT   "Genomic Encyclopedia of Type Strains, Phase III (KMG-III): the genomes of
RT   soil and plant-associated and newly described type strains.";
RL   Submitted (JUL-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|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|PIRNR:PIRNR000381};
CC   -!- COFACTOR:
CC       Name=Zn(2+); Xref=ChEBI:CHEBI:29105;
CC         Evidence={ECO:0000256|PIRNR:PIRNR000381};
CC   -!- COFACTOR:
CC       Name=methylcob(III)alamin; Xref=ChEBI:CHEBI:28115;
CC         Evidence={ECO:0000256|PIRNR:PIRNR000381,
CC         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|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:RED50285.1}.
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DR   EMBL; QRDX01000001; RED50285.1; -; Genomic_DNA.
DR   AlphaFoldDB; A0A3D9HLK4; -.
DR   OrthoDB; 9803687at2; -.
DR   UniPathway; UPA00051; UER00081.
DR   Proteomes; UP000256629; 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; 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; 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   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; 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; PS50972; PTERIN_BINDING; 1.
PE   3: Inferred from homology;
KW   Amino-acid biosynthesis {ECO:0000256|PIRNR:PIRNR000381};
KW   Cobalamin {ECO:0000256|PIRNR:PIRNR000381, ECO:0000256|PIRSR:PIRSR000381-1};
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|PIRNR:PIRNR000381};
KW   Methyltransferase {ECO:0000256|ARBA:ARBA00022603,
KW   ECO:0000256|PIRNR:PIRNR000381};
KW   Reference proteome {ECO:0000313|Proteomes:UP000256629};
KW   Repeat {ECO:0000256|ARBA:ARBA00022737};
KW   S-adenosyl-L-methionine {ECO:0000256|PIRNR:PIRNR000381,
KW   ECO:0000256|PIRSR:PIRSR000381-2};
KW   Transferase {ECO:0000256|ARBA:ARBA00022679, ECO:0000256|PIRNR:PIRNR000381};
KW   Zinc {ECO:0000256|PIRNR:PIRNR000381}.
FT   DOMAIN          25..286
FT                   /note="Pterin-binding"
FT                   /evidence="ECO:0000259|PROSITE:PS50972"
FT   DOMAIN          316..410
FT                   /note="B12-binding N-terminal"
FT                   /evidence="ECO:0000259|PROSITE:PS51337"
FT   DOMAIN          413..548
FT                   /note="B12-binding"
FT                   /evidence="ECO:0000259|PROSITE:PS51332"
FT   DOMAIN          564..890
FT                   /note="AdoMet activation"
FT                   /evidence="ECO:0000259|PROSITE:PS50974"
FT   BINDING         360
FT                   /ligand="methylcob(III)alamin"
FT                   /ligand_id="ChEBI:CHEBI:28115"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT   BINDING         423..427
FT                   /ligand="methylcob(III)alamin"
FT                   /ligand_id="ChEBI:CHEBI:28115"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT   BINDING         426
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         471
FT                   /ligand="methylcob(III)alamin"
FT                   /ligand_id="ChEBI:CHEBI:28115"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT   BINDING         475
FT                   /ligand="methylcob(III)alamin"
FT                   /ligand_id="ChEBI:CHEBI:28115"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT   BINDING         527
FT                   /ligand="methylcob(III)alamin"
FT                   /ligand_id="ChEBI:CHEBI:28115"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT   BINDING         614
FT                   /ligand="S-adenosyl-L-methionine"
FT                   /ligand_id="ChEBI:CHEBI:59789"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT   BINDING         800
FT                   /ligand="S-adenosyl-L-methionine"
FT                   /ligand_id="ChEBI:CHEBI:59789"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT   BINDING         855..856
FT                   /ligand="S-adenosyl-L-methionine"
FT                   /ligand_id="ChEBI:CHEBI:59789"
FT                   /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
SQ   SEQUENCE   890 AA;  100105 MW;  76D3C7F306AEB45B CRC64;
     MKVNQSKYMK LSGLEPLVLN ENSNFINIGE RTNVAGSRKF LRLIKEEKFD EALDIARHQV
     DGGAQIIDIN MDDGLIDGKE AMVKFLNLIA AEPDICRVPI MIDSSKWEII EAGLQVIQGK
     GVVNSISLKE GKDKFIWEAT QIKRYGAAVI VMAFDEVGQA DNYERRIEIA ERSYSILVDE
     VGFPSEDIIF DLNVFPVATG MEEHRKNAID FIEATRWVRQ NLENASVSGG VSNVSFSFRG
     NNIVREAMHS VFLYHAIQAG MNMGIVNPTM LEVYDDIPKD LLEHVEDVIL DRRDDATERL
     LEFAETVKGT KVEKAADLSW RENSLQDRIT HALVKGIDAF IIEDVEEARQ AANRPLNVIE
     GHLMIGMNVV GDLFGEGKMF LPQVVKSARV MKKAVAYLNP FIEAGKSEEQ KALGKILMAT
     VKGDVHDIGK NIVSVVLGCN NYEIVDLGVM VPPEKIIETA KKENVDAIGL SGLITPSLDE
     MVYLAKEMER ENMHIPLLIG GATTSKAHTA VKIDTQYKNA VVHVNDASRA VTVVGDLLNK
     QTANEYVARL KKDYDEFRTK FLKRGKEKSY ISIEEARERK FKIDWGNADI VKPKEMGVQM
     LKQLSLKELL PYIDWSPFFR SWDLHGRYPD ILDDEVVGEQ AKQLFNDAQT MIHDIIAKQL
     LKPKAVFGLF EANSINDDDI SVKKKGEEIA VFRTLRQQLK KREGLPNLAL ADFIAPESEG
     KKDYIGVFCV AIFGAQELAE DYKNKDDDYS AIMAQAIADR FAEAFAEYLH KQVRTKHWGY
     AEGEDLTNDE LIKETYKGIR PAPGYPACPD HLEKETIWEL LEVEKIIGVT LTESLAMWPA
     AAVSGYYFAN PEAKYFGLGK ITDDQVTDYA QRKGITKDKA RKWLHPNLVE
//
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