ID L1J673_GUITC Unreviewed; 1227 AA.
AC L1J673;
DT 06-MAR-2013, integrated into UniProtKB/TrEMBL.
DT 06-MAR-2013, sequence version 1.
DT 27-MAR-2024, entry version 72.
DE RecName: Full=Methionine synthase {ECO:0000256|ARBA:ARBA00012032, 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|PIRNR:PIRNR000381};
GN ORFNames=GUITHDRAFT_159764 {ECO:0000313|EMBL:EKX44016.1};
OS Guillardia theta (strain CCMP2712) (Cryptophyte).
OC Eukaryota; Cryptophyceae; Pyrenomonadales; Geminigeraceae; Guillardia.
OX NCBI_TaxID=905079 {ECO:0000313|EMBL:EKX44016.1};
RN [1] {ECO:0000313|EMBL:EKX44016.1, ECO:0000313|Proteomes:UP000011087}
RP NUCLEOTIDE SEQUENCE.
RC STRAIN=CCMP2712 {ECO:0000313|EMBL:EKX44016.1,
RC ECO:0000313|Proteomes:UP000011087};
RX PubMed=23201678; DOI=10.1038/nature11681;
RG DOE Joint Genome Institute;
RA Curtis B.A., Tanifuji G., Burki F., Gruber A., Irimia M., Maruyama S.,
RA Arias M.C., Ball S.G., Gile G.H., Hirakawa Y., Hopkins J.F., Kuo A.,
RA Rensing S.A., Schmutz J., Symeonidi A., Elias M., Eveleigh R.J.,
RA Herman E.K., Klute M.J., Nakayama T., Obornik M., Reyes-Prieto A.,
RA Armbrust E.V., Aves S.J., Beiko R.G., Coutinho P., Dacks J.B.,
RA Durnford D.G., Fast N.M., Green B.R., Grisdale C.J., Hempel F.,
RA Henrissat B., Hoppner M.P., Ishida K., Kim E., Koreny L., Kroth P.G.,
RA Liu Y., Malik S.B., Maier U.G., McRose D., Mock T., Neilson J.A.,
RA Onodera N.T., Poole A.M., Pritham E.J., Richards T.A., Rocap G., Roy S.W.,
RA Sarai C., Schaack S., Shirato S., Slamovits C.H., Spencer D.F., Suzuki S.,
RA Worden A.Z., Zauner S., Barry K., Bell C., Bharti A.K., Crow J.A.,
RA Grimwood J., Kramer R., Lindquist E., Lucas S., Salamov A., McFadden G.I.,
RA Lane C.E., Keeling P.J., Gray M.W., Grigoriev I.V., Archibald J.M.;
RT "Algal genomes reveal evolutionary mosaicism and the fate of
RT nucleomorphs.";
RL Nature 492:59-65(2012).
RN [2] {ECO:0000313|Proteomes:UP000011087}
RP NUCLEOTIDE SEQUENCE.
RC STRAIN=CCMP2712 {ECO:0000313|Proteomes:UP000011087};
RA Kuo A., Curtis B.A., Tanifuji G., Burki F., Gruber A., Irimia M.,
RA Maruyama S., Arias M.C., Ball S.G., Gile G.H., Hirakawa Y., Hopkins J.F.,
RA Rensing S.A., Schmutz J., Symeonidi A., Elias M., Eveleigh R.J.,
RA Herman E.K., Klute M.J., Nakayama T., Obornik M., Reyes-Prieto A.,
RA Armbrust E.V., Aves S.J., Beiko R.G., Coutinho P., Dacks J.B.,
RA Durnford D.G., Fast N.M., Green B.R., Grisdale C., Hempe F., Henrissat B.,
RA Hoppner M.P., Ishida K.-I., Kim E., Koreny L., Kroth P.G., Liu Y.,
RA Malik S.-B., Maier U.G., McRose D., Mock T., Neilson J.A., Onodera N.T.,
RA Poole A.M., Pritham E.J., Richards T.A., Rocap G., Roy S.W., Sarai C.,
RA Schaack S., Shirato S., Slamovits C.H., Spencer D.F., Suzuki S.,
RA Worden A.Z., Zauner S., Barry K., Bell C., Bharti A.K., Crow J.A.,
RA Grimwood J., Kramer R., Lindquist E., Lucas S., Salamov A., McFadden G.I.,
RA Lane C.E., Keeling P.J., Gray M.W., Grigoriev I.V., Archibald J.M.;
RL Submitted (NOV-2012) to the EMBL/GenBank/DDBJ databases.
RN [3] {ECO:0000313|EnsemblProtists:EKX44016}
RP IDENTIFICATION.
RG EnsemblProtists;
RL Submitted (MAR-2016) to UniProtKB.
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|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; JH993007; EKX44016.1; -; Genomic_DNA.
DR RefSeq; XP_005830996.1; XM_005830939.1.
DR AlphaFoldDB; L1J673; -.
DR STRING; 905079.L1J673; -.
DR PaxDb; 55529-EKX44016; -.
DR EnsemblProtists; EKX44016; EKX44016; GUITHDRAFT_159764.
DR GeneID; 17300606; -.
DR KEGG; gtt:GUITHDRAFT_159764; -.
DR eggNOG; KOG1579; Eukaryota.
DR HOGENOM; CLU_004914_2_0_1; -.
DR OMA; ADCIAMS; -.
DR OrthoDB; 66796at2759; -.
DR UniPathway; UPA00051; UER00081.
DR Proteomes; UP000011087; 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; 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};
KW Reference proteome {ECO:0000313|Proteomes:UP000011087};
KW 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 1..296
FT /note="Hcy-binding"
FT /evidence="ECO:0000259|PROSITE:PS50970"
FT DOMAIN 329..590
FT /note="Pterin-binding"
FT /evidence="ECO:0000259|PROSITE:PS50972"
FT DOMAIN 629..726
FT /note="B12-binding N-terminal"
FT /evidence="ECO:0000259|PROSITE:PS51337"
FT DOMAIN 737..873
FT /note="B12-binding"
FT /evidence="ECO:0000259|PROSITE:PS51332"
FT DOMAIN 889..1227
FT /note="AdoMet activation"
FT /evidence="ECO:0000259|PROSITE:PS50974"
FT BINDING 218
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 281
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 282
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 676
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 747..751
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 750
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 795
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 799
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 852
FT /ligand="methylcob(III)alamin"
FT /ligand_id="ChEBI:CHEBI:28115"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 941
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 1135
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
FT BINDING 1190..1191
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000256|PIRSR:PIRSR000381-2"
SQ SEQUENCE 1227 AA; 135905 MW; B023F59CD642B160 CRC64;
MVIDGAMGTV IQQFKDHPKE LKGNNDLLSL TRPDVINEIH RRYFDAGADI CETNTFSGTT
VAQADYGLEH LVPEINYKSA KLCKMAAIEV EKNTGRRRFC AGAVGPTNRT LSISPKVENA
AFRNITFQEL VTAYKDQVKS LVEGGCDLLF VETIFDTLNA KAALFAIDVF FEEYNVKMPI
VISGTIVDMS GRTLSGQTTE AFWVSVSHAQ PLCVGLNCAL GPDQMRPFMT RLSNVATCFT
HAYPNAGLPN AMGGYDLNPA DMAPKLREWA KDGLVNLVGG CCGTTPDHIK AIADAVADVK
PCRVIPEPVN KMRLSGLEDL TVDKSLLNFA NIGERCNVAG SIRFKKLIIA NDWAKAAEVA
QKQVEDGAQL VDINFDDGML DGVDCMKKFC NLIATEPEIA KVPMVIDSSK FHICIAGLEC
LQGKCIVNSI SLKVGEEEFK QQAKLIKRYG AAVIVMAFDE QGQAAGYEDK VRICQRAYKI
LVEEVKFNPF DIVFDLNILT ICTGLEEHNN YGVDFINATK TVKETCPGAK ISGGLSNLSF
SFRGLESIRE AMHGVFLYHA IKNGMDMAIV NAGNLPIYDD IESELRNLCE DAILNRSSEA
TEKMLELAEK EKQRLEELKA GGGDKVKKAA AEWRNQPVKG RLIHALIKGL DEFIEADVEE
ARVDKDAYPA PLNIIEGPLM EGMNIIGDLF GAGKMFLPQV IKSARVMKKA VAYLTPFMEE
EKARKMAENP DLAVQKPGCV LIATVKGDVH DIGKNIVAVV LGCNNYEVID MGVMCPCEKI
LDKAQEVGAD VIGLSGLITP SLDEMVTVAK EMQRRNMKVP LLIGGATTSR MHTAVKIEPC
YPNAPVIHVL DASRAVSVVS SLLDEQLKDD FAADTRELYE EMREEHYASL EERKFKSLEQ
SRQLPLKVDW KNRSEKPVKP SFLGRRKYVN VPLEELLPYI DWNPFFAVWQ LRGKYPNRGY
PRIFEDEAVG AEAKRVFDDA QKMLKSIVDG RKLQANGVVA FYPANAVGDD IEVYEDDSRS
QVKAVLCTLR QQELREEQSE YLAMSDFIAP KGSGVEDYIG LFAVTAGLGM EKLIASYEEK
NDDYGKIMAQ ALADRLAEAF AEKLHLDVRV KEWGYCPSEG LSPEDLIKVK YEGIRPAPGY
PSQPDHTEKK VMWELLSADE LADITLTESL AMMPAASVSG LYFANPESKY FAVGKICKDQ
VEDYASRKKM DVEETERWLA PILGYDR
//
