ID   SUMT_CYACA              Reviewed;         251 AA.
AC   O19889;
DT   20-JUN-2001, integrated into UniProtKB/Swiss-Prot.
DT   01-JAN-1998, sequence version 1.
DT   03-AUG-2022, entry version 89.
DE   RecName: Full=Uroporphyrinogen-III C-methyltransferase;
DE            Short=Urogen III methylase;
DE            EC=2.1.1.107 {ECO:0000250|UniProtKB:P21631};
DE   AltName: Full=S-adenosyl-L-methionine:uroporphyrinogen III methyltransferase;
DE            Short=SUMT;
DE   AltName: Full=Uroporphyrinogen III methylase;
DE            Short=UROM;
GN   Name=cobA;
OS   Cyanidium caldarium (Red alga).
OG   Plastid; Chloroplast.
OC   Eukaryota; Rhodophyta; Bangiophyceae; Cyanidiales; Cyanidiaceae; Cyanidium.
OX   NCBI_TaxID=2771;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=RK-1;
RX   PubMed=11040290; DOI=10.1007/s002390010101;
RA   Gloeckner G., Rosenthal A., Valentin K.-U.;
RT   "The structure and gene repertoire of an ancient red algal plastid
RT   genome.";
RL   J. Mol. Evol. 51:382-390(2000).
CC   -!- FUNCTION: Catalyzes the two successive C-2 and C-7 methylation
CC       reactions involved in the conversion of uroporphyrinogen III to
CC       precorrin-2 via the intermediate formation of precorrin-1. It is a step
CC       in the biosynthesis of both cobalamin (vitamin B12) and siroheme.
CC       {ECO:0000250|UniProtKB:P21631}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=2 S-adenosyl-L-methionine + uroporphyrinogen III = H(+) +
CC         precorrin-2 + 2 S-adenosyl-L-homocysteine; Xref=Rhea:RHEA:32459,
CC         ChEBI:CHEBI:15378, ChEBI:CHEBI:57308, ChEBI:CHEBI:57856,
CC         ChEBI:CHEBI:58827, ChEBI:CHEBI:59789; EC=2.1.1.107;
CC         Evidence={ECO:0000250|UniProtKB:P21631};
CC       PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:32460;
CC         Evidence={ECO:0000250|UniProtKB:P21631};
CC   -!- PATHWAY: Cofactor biosynthesis; adenosylcobalamin biosynthesis;
CC       precorrin-2 from uroporphyrinogen III: step 1/1.
CC       {ECO:0000250|UniProtKB:P21631}.
CC   -!- PATHWAY: Porphyrin-containing compound metabolism; siroheme
CC       biosynthesis; precorrin-2 from uroporphyrinogen III: step 1/1.
CC       {ECO:0000250|UniProtKB:P21631}.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast.
CC   -!- SIMILARITY: Belongs to the precorrin methyltransferase family.
CC       {ECO:0000305}.
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DR   EMBL; AF022186; AAB82700.1; -; Genomic_DNA.
DR   PIR; T11957; T11957.
DR   RefSeq; NP_045061.1; NC_001840.1.
DR   AlphaFoldDB; O19889; -.
DR   SMR; O19889; -.
DR   PRIDE; O19889; -.
DR   GeneID; 800259; -.
DR   UniPathway; UPA00148; UER00211.
DR   UniPathway; UPA00262; UER00211.
DR   GO; GO:0009507; C:chloroplast; IEA:UniProtKB-SubCell.
DR   GO; GO:0004851; F:uroporphyrin-III C-methyltransferase activity; IEA:UniProtKB-EC.
DR   GO; GO:0032259; P:methylation; IEA:UniProtKB-KW.
DR   GO; GO:0019354; P:siroheme biosynthetic process; IEA:UniProtKB-UniPathway.
DR   CDD; cd11642; SUMT; 1.
DR   Gene3D; 3.30.950.10; -; 1.
DR   Gene3D; 3.40.1010.10; -; 1.
DR   InterPro; IPR000878; 4pyrrol_Mease.
DR   InterPro; IPR035996; 4pyrrol_Methylase_sf.
DR   InterPro; IPR014777; 4pyrrole_Mease_sub1.
DR   InterPro; IPR014776; 4pyrrole_Mease_sub2.
DR   InterPro; IPR006366; CobA/CysG_C.
DR   InterPro; IPR003043; Uropor_MeTrfase_CS.
DR   Pfam; PF00590; TP_methylase; 1.
DR   SUPFAM; SSF53790; SSF53790; 1.
DR   TIGRFAMs; TIGR01469; cobA_cysG_Cterm; 1.
DR   PROSITE; PS00839; SUMT_1; 1.
DR   PROSITE; PS00840; SUMT_2; 1.
PE   3: Inferred from homology;
KW   Chloroplast; Cobalamin biosynthesis; Methyltransferase; Plastid;
KW   Porphyrin biosynthesis; S-adenosyl-L-methionine; Transferase.
FT   CHAIN           1..251
FT                   /note="Uroporphyrinogen-III C-methyltransferase"
FT                   /id="PRO_0000150376"
FT   BINDING         17
FT                   /ligand="S-adenosyl-L-homocysteine"
FT                   /ligand_id="ChEBI:CHEBI:57856"
FT                   /evidence="ECO:0000250|UniProtKB:P21631"
FT   BINDING         93..95
FT                   /ligand="S-adenosyl-L-homocysteine"
FT                   /ligand_id="ChEBI:CHEBI:57856"
FT                   /evidence="ECO:0000250|UniProtKB:P21631"
FT   BINDING         123..124
FT                   /ligand="S-adenosyl-L-homocysteine"
FT                   /ligand_id="ChEBI:CHEBI:57856"
FT                   /evidence="ECO:0000250|UniProtKB:P21631"
FT   BINDING         177
FT                   /ligand="S-adenosyl-L-homocysteine"
FT                   /ligand_id="ChEBI:CHEBI:57856"
FT                   /evidence="ECO:0000250|UniProtKB:P21631"
FT   BINDING         206
FT                   /ligand="S-adenosyl-L-homocysteine"
FT                   /ligand_id="ChEBI:CHEBI:57856"
FT                   /evidence="ECO:0000250|UniProtKB:P21631"
SQ   SEQUENCE   251 AA;  28126 MW;  86F8734B91F94A76 CRC64;
     MTHNKTIKKV YIVGAGPGDP ELLTLKAQRV LREADVVIYD ALVNPEILQH CKPNAEIIKV
     GKRRNNHSFS QLQIASLLID RAKKGERVIR LKGGDPLIFG RLGEEILELF SKNIEIEIIP
     GITSAFAVAA DMKFPLTHRQ LGSSITFLTG EEFYEKTTNK LKWERIIWGA DTIIVYMILY
     NLPKIIKKFL SVGYSAEKPI VLVQWASLKK KNFLIGTIGT IIHQVIESKF GPPSLAIIGE
     VIEISSIIQK L