ID A0A1Y4EXL0_9FIRM Unreviewed; 800 AA.
AC A0A1Y4EXL0;
DT 30-AUG-2017, integrated into UniProtKB/TrEMBL.
DT 30-AUG-2017, sequence version 1.
DT 27-MAR-2024, entry version 20.
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 ORFNames=B5F54_06290 {ECO:0000313|EMBL:OUO74779.1};
OS Anaeromassilibacillus sp. An250.
OC Bacteria; Bacillota; Clostridia; Eubacteriales; Oscillospiraceae;
OC Anaeromassilibacillus.
OX NCBI_TaxID=1965604 {ECO:0000313|EMBL:OUO74779.1, ECO:0000313|Proteomes:UP000195568};
RN [1] {ECO:0000313|Proteomes:UP000195568}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=An250 {ECO:0000313|Proteomes:UP000195568};
RA Medvecky M., Cejkova D., Polansky O., Karasova D., Kubasova T., Cizek A.,
RA Rychlik I.;
RT "Function of individual gut microbiota members based on whole genome
RT sequencing of pure cultures obtained from chicken caecum.";
RL Submitted (APR-2017) 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 -!- 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}.
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:OUO74779.1}.
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DR EMBL; NFJK01000005; OUO74779.1; -; Genomic_DNA.
DR AlphaFoldDB; A0A1Y4EXL0; -.
DR OrthoDB; 9803687at2; -.
DR UniPathway; UPA00051; UER00081.
DR Proteomes; UP000195568; Unassembled WGS sequence.
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}; Reference proteome {ECO:0000313|Proteomes:UP000195568};
KW 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..286
FT /note="Hcy-binding"
FT /evidence="ECO:0000259|PROSITE:PS50970"
FT DOMAIN 315..562
FT /note="Pterin-binding"
FT /evidence="ECO:0000259|PROSITE:PS50972"
FT DOMAIN 577..670
FT /note="B12-binding N-terminal"
FT /evidence="ECO:0000259|PROSITE:PS51337"
FT DOMAIN 674..800
FT /note="B12-binding"
FT /evidence="ECO:0000259|PROSITE:PS51332"
FT BINDING 206
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000256|PROSITE-ProRule:PRU00333"
FT BINDING 271
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000256|PROSITE-ProRule:PRU00333"
FT BINDING 272
FT /ligand="Zn(2+)"
FT /ligand_id="ChEBI:CHEBI:29105"
FT /evidence="ECO:0000256|PROSITE-ProRule:PRU00333"
SQ SEQUENCE 800 AA; 85790 MW; 0AB9601E00027909 CRC64;
MGVLELLGKR IVFFDGAMGT ILQQNGLGAG ELPELWNLER PDLIEQIHRD YLAAGADIVK
TNTFGGNAIK LRGCGHSVQE IVEAAVSHAR HAVESCGRDA YVAMDIGPTG KLLRPLGDLS
FEEAYEAFKE AAQCGEKAGA DLILIETMSD TYEAKAALLA AKENTSLPVF VTMIFDEKGK
LLTGGDIAAA VALLEGLGAD AIGFNCGLGP EQMRTLFPQL LDCCSIPMIV NPNAGLPRSV
DGRTVFDVGP EEFAAVMEEL VREGAWLAGG CCGTTPAHIA AMIQRCKTIF PAPLQPKERT
VISSYSKAVC FGKRPLLIGE RINPTGKSRF KQALRENDMD YILREGIAQQ QAGAHILDVN
VGLPEIDETA MMCRAVTELQ SVVDLPLQID TSNAETMEQA MRLYNGKPLI NSVNGKQESM
CSIFPLVKKY GGVVIALTLD ESGIPETPEG RLAVAKKIVE TAATYGIPKR DIVVDALVMT
ISAGQEAAAV TLDAVRLIEN TLGVHTSLGV SNISFGLPQR ENINAAFFTM ALQSGLSAAI
VNPNSAAMRK AYDAYCALSG VDQQCMDYIA RYSEQPSEAA PKASNAAMSL GQAIISGLKE
SAHAAAEQEL LTKEPLAVIN ESLIPALDRV GKDFETGKLF LPQLLMSADA AKAAFEVVRT
KLDSMETSTA SVKKDKIVLA TVKGDIHDIG KNIVKVLLEN YSYDVIDLGK DIPPEKVVEA
VVQNEVKLVG LSALMTTTVV NMEETIRELH KNAPDCKVMV GGAVLTQEYA DMIHADHYSK
DAMDSVRYAH VIFGDPSGEE
//
