ID   CYSG_SACD2              Reviewed;         458 AA.
AC   Q21K21;
DT   29-APR-2008, integrated into UniProtKB/Swiss-Prot.
DT   18-APR-2006, sequence version 1.
DT   16-JUN-2009, entry version 28.
DE   RecName: Full=Siroheme synthase;
DE   Includes:
DE     RecName: Full=Uroporphyrinogen-III C-methyltransferase;
DE              Short=Urogen III methylase;
DE              EC=2.1.1.107;
DE     AltName: Full=SUMT;
DE     AltName: Full=Uroporphyrinogen III methylase;
DE              Short=UROM;
DE   Includes:
DE     RecName: Full=Precorrin-2 dehydrogenase;
DE              EC=1.3.1.76;
DE   Includes:
DE     RecName: Full=Sirohydrochlorin ferrochelatase;
DE              EC=4.99.1.4;
GN   Name=cysG; OrderedLocusNames=Sde_1698;
OS   Saccharophagus degradans (strain 2-40 / ATCC 43961 / DSM 17024).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Alteromonadales;
OC   Alteromonadaceae; Saccharophagus.
OX   NCBI_TaxID=203122;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RA   Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C., Glavina T.,
RA   Hammon N., Israni S., Pitluck S., Saunders E.H., Brettin T., Bruce D.,
RA   Han C., Tapia R., Gilna P., Schmutz J., Larimer F., Land M.,
RA   Kyrpides N., Lykidis A., Richardson P., Weiner R.;
RT   "Complete sequence of Saccharophagus degradans 2-40.";
RL   Submitted (MAR-2006) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Multifunctional enzyme that catalyzes the SAM-dependent
CC       methylation of uroporphyrinogen III at position C-2 and C-7 to
CC       form precorrin-2 and then position C-12 or C-18 to form
CC       trimethylpyrrocorphin 2. It also catalyzes the conversion of
CC       precorrin-2 into siroheme. This reaction consists of the NAD-
CC       dependent oxidation of precorrin-2 into sirohydrochlorin and its
CC       subsequent ferrochelation into siroheme (By similarity).
CC   -!- CATALYTIC ACTIVITY: S-adenosyl-L-methionine + uroporphyrinogen III
CC       = S-adenosyl-L-homocysteine + precorrin-1.
CC   -!- CATALYTIC ACTIVITY: S-adenosyl-L-methionine + precorrin-1 = S-
CC       adenosyl-L-homocysteine + precorrin-2.
CC   -!- CATALYTIC ACTIVITY: Precorrin-2 + NAD(+) = sirohydrochlorin +
CC       NADH.
CC   -!- CATALYTIC ACTIVITY: Siroheme + 2 H(+) = sirohydrochlorin + Fe(2+).
CC   -!- PATHWAY: Cofactor biosynthesis; adenosylcobalamin biosynthesis;
CC       precorrin-2 from uroporphyrinogen III: step 1/1.
CC   -!- PATHWAY: Cofactor biosynthesis; adenosylcobalamin biosynthesis;
CC       sirohydrochlorin from precorrin-2: step 1/1.
CC   -!- PATHWAY: Porphyrin metabolism; siroheme biosynthesis; precorrin-2
CC       from uroporphyrinogen III: step 1/1.
CC   -!- PATHWAY: Porphyrin metabolism; siroheme biosynthesis; siroheme
CC       from sirohydrochlorin: step 1/1.
CC   -!- PATHWAY: Porphyrin metabolism; siroheme biosynthesis;
CC       sirohydrochlorin from precorrin-2: step 1/1.
CC   -!- SIMILARITY: Belongs to the precorrin methyltransferase family.
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DR   EMBL; CP000282; ABD80958.1; -; Genomic_DNA.
DR   RefSeq; YP_527170.1; -.
DR   GeneID; 3966485; -.
DR   GenomeReviews; CP000282_GR; Sde_1698.
DR   KEGG; sde:Sde_1698; -.
DR   NMPDR; fig|203122.1.peg.4259; -.
DR   HOGENOM; Q21K21; -.
DR   OMA; Q21K21; MCRRDAE.
DR   BioCyc; SDEG203122:SDE_1698-MON; -.
DR   GO; GO:0005488; F:binding; IEA:InterPro.
DR   GO; GO:0043115; F:precorrin-2 dehydrogenase activity; IEA:HAMAP.
DR   GO; GO:0051266; F:sirohydrochlorin ferrochelatase activity; IEA:EC.
DR   GO; GO:0004851; F:uroporphyrin-III C-methyltransferase activity; IEA:HAMAP.
DR   GO; GO:0009236; P:cobalamin biosynthetic process; IEA:HAMAP.
DR   GO; GO:0055114; P:oxidation reduction; IEA:UniProtKB-KW.
DR   GO; GO:0019354; P:siroheme biosynthetic process; IEA:HAMAP.
DR   HAMAP; MF_01646; -; 1.
DR   InterPro; IPR000878; 4pyrrol_Mease.
DR   InterPro; IPR014777; 4pyrrole_Mease_sub1.
DR   InterPro; IPR014776; 4pyrrole_Mease_sub2.
DR   InterPro; IPR006366; CobA_cysG_C.
DR   InterPro; IPR016040; NAD(P)-bd_dom.
DR   InterPro; IPR019478; Sirohaem_synthase_dimer_dom.
DR   InterPro; IPR006367; Sirohaem_synthase_N.
DR   InterPro; IPR003043; Uropor_MeTrfase_CS.
DR   Gene3D; G3DSA:3.40.1010.10; 4pyrrole_Mease_sub1; 1.
DR   Gene3D; G3DSA:3.30.950.10; 4pyrrole_Mease_sub2; 1.
DR   Gene3D; G3DSA:3.40.50.720; NAD(P)-bd; 1.
DR   Pfam; PF10414; CysG_dimeriser; 1.
DR   Pfam; PF00590; TP_methylase; 1.
DR   TIGRFAMs; TIGR01469; cobA_cysG_Cterm; 1.
DR   TIGRFAMs; TIGR01470; cysG_Nterm; 1.
DR   PROSITE; PS00839; SUMT_1; FALSE_NEG.
DR   PROSITE; PS00840; SUMT_2; 1.
PE   3: Inferred from homology;
KW   Cobalamin biosynthesis; Complete proteome; Lyase; Methyltransferase;
KW   Multifunctional enzyme; NAD; Oxidoreductase; Porphyrin biosynthesis;
KW   S-adenosyl-L-methionine; Transferase.
FT   CHAIN         1    458       Siroheme synthase.
FT                                /FTId=PRO_0000330551.
FT   REGION      218    458       Uroporphyrinogen-III C-methyltransferase.
SQ   SEQUENCE   458 AA;  50119 MW;  00C40A4EBBA40706 CRC64;
     MDYLPLFFDL KAKPCLIVGG GTIATRKARL LHKAGAKLHV VAPKVSEELE KLVAASNGKV
     FKQEYDQTFL DDVILVISAT DIDAVNSVVA ADCHAIKLPV NVVDSPALCS VIMPAIIDRS
     PLIIGVTSGG EAPVLARRVR SMLESSIPAA YGQLAQLASK FRQRAKDVFE NGDLRRRFWE
     NILNGPIAEK VLGGNLAAAE QLIEAQLDSA SVEKTGEVYL VGAGPGDPDL LTFKALRLMQ
     QAEVVLYDRL VSEPILEMTR RDAERIYVGK KRAEHAVPQQ KINQMLLELA QQGKRVLRLK
     GGDPFIFGRG GEEIDLLAEH KIPFQVVPGI TAASGCASYS GIPLTHRDYS QSVRFITGHL
     QEGKENFRWS EFVDKQQTLV FYMGLAGLET ICSKLIEYGK SPSTPAALIE RGTLPEQRVH
     VSDLAGLAAK IEGLDVHAPT LLIIGDVVRC HEKLNWYK
//