ID A0A0S1SFQ0_9FLAO Unreviewed; 907 AA.
AC A0A0S1SFQ0;
DT 17-FEB-2016, integrated into UniProtKB/TrEMBL.
DT 17-FEB-2016, sequence version 1.
DT 27-MAR-2024, entry version 36.
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=SB49_15255 {ECO:0000313|EMBL:ALM08997.1};
OS Sediminicola sp. YIK13.
OC Bacteria; Bacteroidota; Flavobacteriia; Flavobacteriales;
OC Flavobacteriaceae; Sediminicola.
OX NCBI_TaxID=1453352 {ECO:0000313|EMBL:ALM08997.1, ECO:0000313|Proteomes:UP000063759};
RN [1] {ECO:0000313|Proteomes:UP000063759}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=YIK13 {ECO:0000313|Proteomes:UP000063759};
RA Kwon Y.M., Kim S.-J.;
RT "Genome sequence of Sediminicola sp. YIK13.";
RL Submitted (JAN-2015) to the EMBL/GenBank/DDBJ databases.
RN [2] {ECO:0000313|EMBL:ALM08997.1, ECO:0000313|Proteomes:UP000063759}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=YIK13 {ECO:0000313|EMBL:ALM08997.1,
RC ECO:0000313|Proteomes:UP000063759};
RX PubMed=26823585;
RA Kwon Y.M., Kim S.J.;
RT "Complete Genome Sequence of the Proteorhodopsin-Containing Marine
RT Bacterium Sediminicola sp. YIK13.";
RL Genome Announc. 4:e01635-15(2016).
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}.
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DR EMBL; CP010535; ALM08997.1; -; Genomic_DNA.
DR RefSeq; WP_062058389.1; NZ_CP010535.1.
DR AlphaFoldDB; A0A0S1SFQ0; -.
DR STRING; 1453352.SB49_15255; -.
DR KEGG; syi:SB49_15255; -.
DR PATRIC; fig|1453352.4.peg.3195; -.
DR OrthoDB; 9803687at2; -.
DR UniPathway; UPA00051; UER00081.
DR Proteomes; UP000063759; Chromosome.
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_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 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:UP000063759};
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 419..554
FT /note="B12-binding"
FT /evidence="ECO:0000259|PROSITE:PS51332"
FT DOMAIN 570..907
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 429..433
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 432
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 477
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 481
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 533
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 620
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 816
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 871..872
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
SQ SEQUENCE 907 AA; 102071 MW; B8F90A8C68CC6357 CRC64;
MSIIKPKYLK LSGLEPLVIT PESNFVNVGE RTNVAGSKKF LRLIKEEKFE EALDIARDQV
EGGAQIIDVN MDDGLIDGKE AMVKFLNLIV AEPDISRVPI MIDSSKWEII EAGLQVVQGK
CVVNSISLKE GEAEFIHHAK LVKRYGAAVI VMAFDEVGQA DNYERRLEIS KRSYDILVNK
VKFAPENIIF DLNVFPVATG MDEHKRNALD FIEATAWVKK NLPHCSVSGG VSNVSFSFRG
NNPVREAMHS VFLYHAIKAG MNIGIVNPTM LEVYDDIPKD LLDRVEDVIL NRRDDATERL
LDFAETVVGT AKESKVDLTW RTESLQNRIT RALVKGIDQY IIEDVEEARQ SVDKPIKVIE
GHLMTGMNVV GDLFGSGKMF LPQVVKSARV MKKAVAYLLP YIEEEKLKNP LPEGSSSSAG
KILMATVKGD VHDIGKNIVS VVLACNNYEI IDLGVMVPPE KIINAAKEHQ VDIIGLSGLI
TPSLDEMVYL AKEMERQNFS VPLLIGGATT SKAHTAVKID PQYKNTVVHV NDASRAVTVV
GDLLQKETSR TYKDSIKLDY EEFRTQFAKR GKRKEYLPLS EARTNKYKID WNEKDIAVPK
NMGVQVIKDL ELRKLKDFID WTPFFRSWEL HGKYPAILTD EVVGKEATEL FKDAQTLLEK
IFDEKLLTAK AVFGLFQANS INDDDIEVIV PPGHHAKKHQ GEKKFVFRTL RQQLKKYEGK
PNFALADYIA PKESGIEDYM GFFCVSTGFG TAELAADYEK DLDDYNSIMI KALSDRLAEA
FAEYLHKEVR TDHWGYASDE RLTNEELISE SYKGIRPAPG YPACPDHLEK LTIWELLRVK
QRIGVKLTDS LAMWPAASVS GYYFAHPEAR YFGVGKIKED QVYDFAKRKA ISEEMAEKWL
APNIADD
//
