ID A0A140NLM2_PROSM Unreviewed; 1227 AA.
AC A0A140NLM2;
DT 11-MAY-2016, integrated into UniProtKB/TrEMBL.
DT 11-MAY-2016, sequence version 1.
DT 27-MAR-2024, entry version 49.
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 Name=metH {ECO:0000313|EMBL:AFH93548.1};
GN OrderedLocusNames=S70_08425 {ECO:0000313|EMBL:AFH93548.1};
OS Providencia stuartii (strain MRSN 2154).
OC Bacteria; Pseudomonadota; Gammaproteobacteria; Enterobacterales;
OC Morganellaceae; Providencia.
OX NCBI_TaxID=1157951 {ECO:0000313|EMBL:AFH93548.1, ECO:0000313|Proteomes:UP000005012};
RN [1] {ECO:0000313|EMBL:AFH93548.1, ECO:0000313|Proteomes:UP000005012}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=MRSN 2154 {ECO:0000313|EMBL:AFH93548.1,
RC ECO:0000313|Proteomes:UP000005012};
RX PubMed=22740665; DOI=10.1128/JB.00615-12;
RA Clifford R.J., Hang J., Riley M.C., Onmus-Leone F., Kuschner R.A.,
RA Lesho E.P., Waterman P.E.;
RT "Complete Genome Sequence of Providencia stuartii Clinical Isolate MRSN
RT 2154.";
RL J. Bacteriol. 194:3736-3737(2012).
RN [2] {ECO:0000313|Proteomes:UP000005012}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=MRSN 2154 {ECO:0000313|Proteomes:UP000005012};
RA Clifford R.J., Hang J., Riley M.C., Onmus-Leone F., Kuschner R.A.,
RA Lesho E.P., Waterman P.E.;
RT "Complete genome sequence of Providencia stuartii clinical isolate MRSN
RT 2154.";
RL Submitted (APR-2012) 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}.
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DR EMBL; CP003488; AFH93548.1; -; Genomic_DNA.
DR AlphaFoldDB; A0A140NLM2; -.
DR KEGG; psi:S70_08425; -.
DR PATRIC; fig|1157951.4.peg.1681; -.
DR HOGENOM; CLU_004914_2_2_6; -.
DR UniPathway; UPA00051; UER00081.
DR Proteomes; UP000005012; 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; 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_sf.
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}; 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 5..325
FT /note="Hcy-binding"
FT /evidence="ECO:0000259|PROSITE:PS50970"
FT DOMAIN 356..617
FT /note="Pterin-binding"
FT /evidence="ECO:0000259|PROSITE:PS50972"
FT DOMAIN 649..743
FT /note="B12-binding N-terminal"
FT /evidence="ECO:0000259|PROSITE:PS51337"
FT DOMAIN 745..880
FT /note="B12-binding"
FT /evidence="ECO:0000259|PROSITE:PS51332"
FT DOMAIN 896..1226
FT /note="AdoMet activation"
FT /evidence="ECO:0000259|PROSITE:PS50974"
FT BINDING 247
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 310
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 311
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 693
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 755..759
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 758
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 803
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 807
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 859
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 945
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 1133
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 1188..1189
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
SQ SEQUENCE 1227 AA; 136564 MW; E05936D602C2A4AD CRC64;
MVYKISMLEQ ELQKRILVLD GAMGTMIQRH KLTEEQFRGE RFADWPCDLK GNNDLLVLTQ
PEIIRDIHDQ YFAAGADIVE TNTFNSTTIA MADYKMESLS AEINEAAARI ARECADEWTR
KTPEQPRYVA GVLGPTNRTA SISPDVNDPA FRNINFDQLV EAYRESTRAL IKGGVDLIMI
ETIFDTLNAK AAIFAVETEF EALGVTLPVM ISGTITDASG RTLSGQTTEA FYNSLRHARP
LSFGLNCALG PNELRQYVSE LSRIAECYVS AHPNAGLPNA FGEYDLDAQN MAEQIREWAQ
AGFLNIVGGC CGTTPLHIKK IVEAVKGIAP RALPKLPVEC RLSGLEPLNI GKDSLFVNVG
ERTNVTGSAK FKRLIKEGNY QEALDIARQQ VENGAQIIDI NMDEGMLDSE AAMVRFLNLI
AGEPDIARVP IMIDSSKWDV IEKGLKCIQG KGIVNSISMK EGESAFIEHA KLVRKYGAAV
IVMAFDEVGQ ADTRERKIEI CRRAYHVLTD TVGFPPEDII FDPNIFAVAT GIEEHNNYAV
DFIEVCQDIK QQLPHAMISG GVSNVSFSFR GNDPVREAIH AVFLYYAIRN GMDMGIVNAG
QLAIYDDLPK ELKDAVEDVI LNRREDSTER LLELAEKYRA SGSEEQQVQQ AEWRSWAVEK
RLEYALVKGI TEFIIPDTEE ARQLAASPIE VIEGPLMNGM NVVGDLFGEG KMFLPQVVKS
ARVMKQAVAY LEPYIQALKQ SGSSAGKILL ATVKGDVHDI GKNIVGVVLQ CNNYEIVDLG
VMVPCETILK TAREQNVDVI GLSGLITPSL DEMVHVAKEM ERQGFTIPLM IGGATTSKAH
TAVKIEPNYS HSVTYVQNAS RTVGVVSALL SATQKAEFVA RTRREYEIVR EQHGRKKPKT
PPVSLEVARA NSVKIDWQNY QPPVPRFLGV KEVKASIETL RHYIDWTPFF MTWSLAGKYP
RILEDEVVGE EARKLLKDAN NMLDQLAKDN ALTPRGIFGL FPANSVGDDI EIYRSSARDS
ADVIALNLRQ QTEKKEFPNY CLSDFVAPKA SGKADYIGAF AVTGGLEEDA LADGYEQQHD
DYNKIMLKAL ADRLAEAFAE YLHQQVRKEY WGYAPDEDLP NDELIREKYQ GIRPAPGYPA
CPEHTEKAKI WQLLDVENQI GMQLTSSYAM WPGASVSGWY FSHPESKYFA VAQVQRDQVE
DYAKRKGMSV SELERWLAPN LGYDPED
//
