ID B1L1X1_CLOBM Unreviewed; 792 AA.
AC B1L1X1;
DT 29-APR-2008, integrated into UniProtKB/TrEMBL.
DT 29-APR-2008, sequence version 1.
DT 27-MAR-2024, entry version 84.
DE RecName: Full=Methionine synthase {ECO:0000256|ARBA:ARBA00013998};
DE EC=2.1.1.13 {ECO:0000256|ARBA:ARBA00012032};
DE AltName: Full=5-methyltetrahydrofolate--homocysteine methyltransferase {ECO:0000256|ARBA:ARBA00031040};
GN OrderedLocusNames=CLK_1087 {ECO:0000313|EMBL:ACA56589.1};
OS Clostridium botulinum (strain Loch Maree / Type A3).
OC Bacteria; Bacillota; Clostridia; Eubacteriales; Clostridiaceae;
OC Clostridium.
OX NCBI_TaxID=498214 {ECO:0000313|EMBL:ACA56589.1, ECO:0000313|Proteomes:UP000000722};
RN [1] {ECO:0000313|EMBL:ACA56589.1, ECO:0000313|Proteomes:UP000000722}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=Loch Maree / Type A3 {ECO:0000313|Proteomes:UP000000722};
RX PubMed=18060065; DOI=10.1371/journal.pone.0001271;
RA Smith T.J., Hill K.K., Foley B.T., Detter J.C., Munk A.C., Bruce D.C.,
RA Doggett N.A., Smith L.A., Marks J.D., Xie G., Brettin T.S.;
RT "Analysis of the neurotoxin complex genes in Clostridium botulinum A1-A4
RT and B1 strains: BoNT/A3, /Ba4 and /B1 clusters are located within
RT plasmids.";
RL PLoS ONE 2:E1271-E1271(2007).
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 -!- 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 -!- COFACTOR:
CC Name=Zn(2+); Xref=ChEBI:CHEBI:29105;
CC Evidence={ECO:0000256|ARBA:ARBA00001947,
CC ECO:0000256|PROSITE-ProRule:PRU00333};
CC -!- COFACTOR:
CC Name=methylcob(III)alamin; Xref=ChEBI:CHEBI:28115;
CC Evidence={ECO:0000256|ARBA:ARBA00001956};
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}.
CC -!- SIMILARITY: Belongs to the vitamin-B12 dependent methionine synthase
CC family. {ECO:0000256|ARBA:ARBA00010398}.
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DR EMBL; CP000962; ACA56589.1; -; Genomic_DNA.
DR RefSeq; WP_012344441.1; NC_010520.1.
DR AlphaFoldDB; B1L1X1; -.
DR KEGG; cbl:CLK_1087; -.
DR HOGENOM; CLU_004914_0_2_9; -.
DR UniPathway; UPA00051; UER00081.
DR Proteomes; UP000000722; Chromosome.
DR GO; GO:0031419; F:cobalamin binding; IEA:UniProtKB-KW.
DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR GO; GO:0008705; F:methionine synthase activity; IEA:UniProtKB-EC.
DR GO; GO:0032259; P:methylation; IEA:UniProtKB-KW.
DR GO; GO:0042558; P:pteridine-containing compound metabolic process; IEA:InterPro.
DR CDD; cd02070; corrinoid_protein_B12-BD; 1.
DR Gene3D; 3.40.50.280; Cobalamin-binding domain; 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 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; IPR017215; MetH_bac.
DR InterPro; IPR036594; Meth_synthase_dom.
DR InterPro; IPR000489; Pterin-binding_dom.
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; PF00809; Pterin_bind; 1.
DR Pfam; PF02574; S-methyl_trans; 1.
DR PIRSF; PIRSF037472; DHPS_mtfrase; 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; SSF47644; Methionine synthase domain; 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 Cobalamin {ECO:0000256|ARBA:ARBA00022628};
KW Cobalt {ECO:0000256|ARBA:ARBA00023285};
KW Metal-binding {ECO:0000256|ARBA:ARBA00022723, ECO:0000256|PROSITE-
KW ProRule:PRU00333}; Methionine biosynthesis {ECO:0000256|ARBA:ARBA00023167};
KW Methyltransferase {ECO:0000256|ARBA:ARBA00022603, ECO:0000256|PROSITE-
KW ProRule:PRU00333}; S-adenosyl-L-methionine {ECO:0000256|ARBA:ARBA00022691};
KW Transferase {ECO:0000256|ARBA:ARBA00022679, ECO:0000256|PROSITE-
KW ProRule:PRU00333};
KW Zinc {ECO:0000256|ARBA:ARBA00022833, ECO:0000256|PROSITE-ProRule:PRU00333}.
FT DOMAIN 1..284
FT /note="Hcy-binding"
FT /evidence="ECO:0000259|PROSITE:PS50970"
FT DOMAIN 312..556
FT /note="Pterin-binding"
FT /evidence="ECO:0000259|PROSITE:PS50972"
FT DOMAIN 575..668
FT /note="B12-binding N-terminal"
FT /evidence="ECO:0000259|PROSITE:PS51337"
FT DOMAIN 670..792
FT /note="B12-binding"
FT /evidence="ECO:0000259|PROSITE:PS51332"
FT BINDING 204
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000256|PROSITE-ProRule:PRU00333"
FT BINDING 269
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000256|PROSITE-ProRule:PRU00333"
FT BINDING 270
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000256|PROSITE-ProRule:PRU00333"
SQ SEQUENCE 792 AA; 87660 MW; 062436C5DF1E6B97 CRC64;
MNIKDYIKEN ILIFDGAMGT MLQKLGLNIS DLPEELNILE PKKIINIHKK YIEAGAKVIT
TNTFGANEIK LKQSKFSLES IIDKAIDNVK KARENKEILI ALDIGPIGQL LEPMGTLKFE
EAYEIFKRQI VQGQKSGADI ILIETMTDLY EAKAAILAAK ENTNLPVFCT MTFEKNKRTF
TGCTPLSMVL TLEGLGVDAL GVNCSLGPNE LGDIVDEIIK YSSIPIMVQP NAGLPTIKEG
RTIYNIKPKE FADFQRSIVE KGVRIVGGCC GTTDEFIREI VYSLKDVKAK KLKENNICGV
CSSTKAVLID GVKIIGERIN PTGKKLFKEA LRNNDTDYIL KEAISQVECG ADILDVNVGL
PEINEEETMK KVIKEIQSII DTPLQIDSNN PKVIEKALRV YNGKAIVNSV NGEEEVLDSV
LPLIKKYGAA VVGLTLDDKG IPKKAEERLK IAEKIVNKAL EYGIRREDIF IDCLVLTASA
QQEDVGETLK AVALVKEKLK VKTILGVSNI SFGLPNRELI NKTFLAMSLQ SGLDLPILNP
NNKEMINIIN AFKVLNNEDI GATNYIDMYG NETSNSKDVK IQRDNLTLKE IVIKGIKEGA
YSKTKKLLKD RDELSIINEE LIPALDEVGE KYEKGIIFLP QLIQSAETVK KAFKAIKEKL
REDNSPKINK GKILMATVKG DIHDIGKNIV KVILENYGFD IIDLGKDVEA DKIVEEVKKN
NIKLVGLSAL MTTTVNSMKD TIKDLKESGI DCKVFVGGAV LNKEYAEMIN ADYYAKDAKE
AVDIAKEFFG GF
//
