ID U2ELK1_9GAMM Unreviewed; 906 AA.
AC U2ELK1;
DT 13-NOV-2013, integrated into UniProtKB/TrEMBL.
DT 13-NOV-2013, sequence version 1.
DT 27-MAR-2024, entry version 53.
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=metH2 {ECO:0000313|EMBL:ERJ18805.1};
GN ORFNames=SSPSH_002298 {ECO:0000313|EMBL:ERJ18805.1};
OS Salinisphaera shabanensis E1L3A.
OC Bacteria; Pseudomonadota; Gammaproteobacteria; Salinisphaerales;
OC Salinisphaeraceae; Salinisphaera.
OX NCBI_TaxID=1033802 {ECO:0000313|EMBL:ERJ18805.1, ECO:0000313|Proteomes:UP000006242};
RN [1] {ECO:0000313|EMBL:ERJ18805.1, ECO:0000313|Proteomes:UP000006242}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=E1L3A {ECO:0000313|EMBL:ERJ18805.1,
RC ECO:0000313|Proteomes:UP000006242};
RX PubMed=21705588; DOI=10.1128/JB.05459-11;
RA Antunes A., Alam I., Bajic V.B., Stingl U.;
RT "Genome sequence of Salinisphaera shabanensis, a gammaproteobacterium from
RT the harsh, variable environment of the brine-seawater interface of the
RT Shaban Deep in the Red Sea.";
RL J. Bacteriol. 193:4555-4556(2011).
RN [2] {ECO:0000313|EMBL:ERJ18805.1, ECO:0000313|Proteomes:UP000006242}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=E1L3A {ECO:0000313|EMBL:ERJ18805.1,
RC ECO:0000313|Proteomes:UP000006242};
RX PubMed=24324765;
RA Alam I., Antunes A., Kamau A.A., Ba Alawi W., Kalkatawi M., Stingl U.,
RA Bajic V.B.;
RT "INDIGO - INtegrated Data Warehouse of MIcrobial GenOmes with Examples from
RT the Red Sea Extremophiles.";
RL PLoS ONE 8:E82210-E82210(2013).
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}.
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:ERJ18805.1}.
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DR EMBL; AFNV02000015; ERJ18805.1; -; Genomic_DNA.
DR RefSeq; WP_006914481.1; NZ_AFNV02000015.1.
DR AlphaFoldDB; U2ELK1; -.
DR STRING; 1033802.SSPSH_002298; -.
DR eggNOG; COG1410; Bacteria.
DR UniPathway; UPA00051; UER00081.
DR Proteomes; UP000006242; Unassembled WGS sequence.
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:UP000006242};
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 7..268
FT /note="Pterin-binding"
FT /evidence="ECO:0000259|PROSITE:PS50972"
FT DOMAIN 300..394
FT /note="B12-binding N-terminal"
FT /evidence="ECO:0000259|PROSITE:PS51337"
FT DOMAIN 399..534
FT /note="B12-binding"
FT /evidence="ECO:0000259|PROSITE:PS51332"
FT DOMAIN 549..902
FT /note="AdoMet activation"
FT /evidence="ECO:0000259|PROSITE:PS50974"
FT BINDING 344
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 409..413
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 412
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 457
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 461
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 513
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 621
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 809
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 864..865
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
SQ SEQUENCE 906 AA; 100735 MW; 46F56968BFB4CBA6 CRC64;
MTSAINFINI GERTNVTGSA RFKRLIKEED YDTALSVARE QVENGAQIID INMDEGMLDS
VEAMRKFLNL IAGEPDIAKV PVMVDSSKWE VIEAGLKCIQ GKGMVNSISL KEGEDKFLEQ
AQACLDYGAA VVVMAFDEAG QADTEDRKVE IAERGYALLV DKLDFPPEDI IFDLNIFAIA
TGIEEHNNYA VDFINATKRV RESCPGCHVS GGLSNVSFSF RGNETVRQAM HSVFLYHAIP
AGLDMAIVNA GQLEVYDDIP DKLREACEDV VLNRRDDATE RLLDLAEEYK GKGKKKDSKE
DLAWREFEVN KRLEHALVKG IDSYVTEDTE EARQKASRPL DVIEGPLMDG MNVVGDLFGA
GKMFLPQVVK SARVMKKAVA YLLPFIEEEK EEADKGSNNG TIIMATVKGD VHDIGKNIVG
VVLQCNNFEV IDLGVMVPMN DILDAAEKHN AHVIGLSGLI TPSLDEMVNV AAEMQRRGMN
TPLLIGGATT SRAHTAVKID PAYNGAVMWV KDASRSVPVA SRMVSKDARA KLEAELKDDY
DKLRERHSNK KKDKFLTLAQ ARANGVALDW DNYEPPRPKL PETTEYALRE APPYISGEAS
DESGIYVFED FPLEQLVDTI DWTPFFLSWE MKGRYPNILN DPNKGPEARK LFDEAQAMLK
QIVDEKWLTA KGVAGIFPAQ RVGDDIHVLN DDRSETVHVM HNLRQQSEHR EGVPNRSLAD
FIAPEDAGKP DWVGAFAVTA GLGSKDIVER YKAQNDDYNA ILVEALADRL AESFAEWLHK
FVRTELWGHA ADETLANEDL IGEKYKGIRP APGYPACPEH TEKDTLWEML DVEARTGIEL
TESRAMWPGA AVSGWYFSHP ESRYFVVGRV AKDQVKDYAK RKGWDIATAE KWIGPNLGYE
PGGGEE
//
