ID G2ZN17_9RALS Unreviewed; 911 AA.
AC G2ZN17;
DT 16-NOV-2011, integrated into UniProtKB/TrEMBL.
DT 16-NOV-2011, sequence version 1.
DT 27-MAR-2024, entry version 48.
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 Name=metHb {ECO:0000313|EMBL:CCA80436.1};
GN ORFNames=BDB_100116 {ECO:0000313|EMBL:CCA80436.1};
OS blood disease bacterium R229.
OC Bacteria; Pseudomonadota; Betaproteobacteria; Burkholderiales;
OC Burkholderiaceae; Ralstonia.
OX NCBI_TaxID=741978 {ECO:0000313|EMBL:CCA80436.1};
RN [1] {ECO:0000313|EMBL:CCA80436.1}
RP NUCLEOTIDE SEQUENCE.
RC STRAIN=R229 {ECO:0000313|EMBL:CCA80436.1};
RX PubMed=21931687; DOI=10.1371/journal.pone.0024356;
RA Remenant B., de Cambiaire J.C., Cellier G., Jacobs J.M., Mangenot S.,
RA Barbe V., Lajus A., Vallenet D., Medigue C., Fegan M., Allen C., Prior P.;
RT "Ralstonia syzygii, the Blood Disease Bacterium and some Asian R.
RT solanacearum strains form a single genomic species despite divergent
RT lifestyles.";
RL PLoS ONE 6:e24356-e24356(2011).
RN [2] {ECO:0000313|EMBL:CCA80436.1}
RP NUCLEOTIDE SEQUENCE.
RC STRAIN=R229 {ECO:0000313|EMBL:CCA80436.1};
RA Genoscope - CEA;
RL Submitted (APR-2011) 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}.
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DR EMBL; FR854066; CCA80436.1; -; Genomic_DNA.
DR AlphaFoldDB; G2ZN17; -.
DR UniPathway; UPA00051; UER00081.
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}; 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 22..283
FT /note="Pterin-binding"
FT /evidence="ECO:0000259|PROSITE:PS50972"
FT DOMAIN 313..411
FT /note="B12-binding N-terminal"
FT /evidence="ECO:0000259|PROSITE:PS51337"
FT DOMAIN 420..565
FT /note="B12-binding"
FT /evidence="ECO:0000259|PROSITE:PS51332"
FT DOMAIN 580..911
FT /note="AdoMet activation"
FT /evidence="ECO:0000259|PROSITE:PS50974"
FT BINDING 361
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 430..434
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 433
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 484
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 488
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 544
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 630
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 824
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 878..879
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
SQ SEQUENCE 911 AA; 100686 MW; D3E3AF1ADF5FBB8A CRC64;
MTDHLMRLSG LEPFNIGEDT LFVNVGERTN VTGSKAFARM ILNSQFDEAL AVARQQVENG
AQVIDVNMDE AMLDSKAAMV RFLNLIASEP DIARVPIMID SSKWEVIEAG LKCVQGKAIV
NSISLKEGEE QFAHHAKLIK RYGAAAVVMA FDEQGQADTF ARKTAICKRS YDFLVNEVGF
PPEDIIFDPN IFAVATGIEE HNNYAVDFIE ATRWIKQNLP HAKVSGGVSN VSFSFRGNDV
VREAIHTVFL YYAIGAGMDM GIVNAGQLGV YENLDPELRE RVEDVVLNHR PDATDRLLEI
ADRYKGGGTK REENLAWREQ PVEKRLAHAL VHGINDYVVE DTEEVRQKIF AAGGRPIQVI
EGPLMDGMNI VGDLFGAGKM FLPQVVKSAR VMKQAVAHLI PFIEEEKRRI AAAGGDVHSR
GKIVIATVKG DVHDIGKNIV TVVLQCNNFE VVNMGVMVPC NEILAKAKAK AKAKVEGADI
IGLSGLITPS LEEMAYVAAE MQRDDYFRLK KIPLLIGGAT TSRVHTAVKI APNYEGPVVY
VPDASRSVSV ASSLLSDEAA ARYIDELHAD YDRIRTQHAS KKATPMVSLA AARTNKTRID
WAGYTPPKPK FIGRRMFRNY DLNELAQYID WGPFFQTWDL AGKFPDILND EIVGESARRV
FSDGKSMLAR LIAGRWLTAN GVIAMLPANT VNDDDIEIYT DETRSEVALT WRNIRQQSER
PIIDGVMRPN RCLADFIAPK DTGIADYIGL FAVTGGIGVD KREAAFEADH DDYSAIMLKA
LADRFAEAFA ECLHARVRRD LWGYAADETL DNDALIREEY RGIRPAPGYP ACPEHTVKRD
MFRVLDAQEI GMGLTDALAM TPAASVSGFY LSHPDSTYFT IGKIGQDQVD DMAARSGEDR
RNVERALAPN L
//
