ID   ISPD_LACE2              Reviewed;         227 AA.
AC   C4Z312;
DT   22-SEP-2009, integrated into UniProtKB/Swiss-Prot.
DT   28-JUL-2009, sequence version 1.
DT   25-MAY-2022, entry version 68.
DE   RecName: Full=2-C-methyl-D-erythritol 4-phosphate cytidylyltransferase {ECO:0000255|HAMAP-Rule:MF_00108};
DE            EC=2.7.7.60 {ECO:0000255|HAMAP-Rule:MF_00108};
DE   AltName: Full=4-diphosphocytidyl-2C-methyl-D-erythritol synthase {ECO:0000255|HAMAP-Rule:MF_00108};
DE   AltName: Full=MEP cytidylyltransferase {ECO:0000255|HAMAP-Rule:MF_00108};
DE            Short=MCT {ECO:0000255|HAMAP-Rule:MF_00108};
GN   Name=ispD {ECO:0000255|HAMAP-Rule:MF_00108};
GN   OrderedLocusNames=EUBELI_00381;
OS   Lachnospira eligens (strain ATCC 27750 / DSM 3376 / VPI C15-48 / C15-B4)
OS   (Eubacterium eligens).
OC   Bacteria; Firmicutes; Clostridia; Eubacteriales; Lachnospiraceae;
OC   Lachnospira.
OX   NCBI_TaxID=515620;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 27750 / DSM 3376 / VPI C15-48 / C15-B4;
RX   PubMed=19321416; DOI=10.1073/pnas.0901529106;
RA   Mahowald M.A., Rey F.E., Seedorf H., Turnbaugh P.J., Fulton R.S.,
RA   Wollam A., Shah N., Wang C., Magrini V., Wilson R.K., Cantarel B.L.,
RA   Coutinho P.M., Henrissat B., Crock L.W., Russell A., Verberkmoes N.C.,
RA   Hettich R.L., Gordon J.I.;
RT   "Characterizing a model human gut microbiota composed of members of its two
RT   dominant bacterial phyla.";
RL   Proc. Natl. Acad. Sci. U.S.A. 106:5859-5864(2009).
CC   -!- FUNCTION: Catalyzes the formation of 4-diphosphocytidyl-2-C-methyl-D-
CC       erythritol from CTP and 2-C-methyl-D-erythritol 4-phosphate (MEP).
CC       {ECO:0000255|HAMAP-Rule:MF_00108}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=2-C-methyl-D-erythritol 4-phosphate + CTP + H(+) = 4-CDP-2-C-
CC         methyl-D-erythritol + diphosphate; Xref=Rhea:RHEA:13429,
CC         ChEBI:CHEBI:15378, ChEBI:CHEBI:33019, ChEBI:CHEBI:37563,
CC         ChEBI:CHEBI:57823, ChEBI:CHEBI:58262; EC=2.7.7.60;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00108};
CC   -!- PATHWAY: Isoprenoid biosynthesis; isopentenyl diphosphate biosynthesis
CC       via DXP pathway; isopentenyl diphosphate from 1-deoxy-D-xylulose 5-
CC       phosphate: step 2/6. {ECO:0000255|HAMAP-Rule:MF_00108}.
CC   -!- SIMILARITY: Belongs to the IspD/TarI cytidylyltransferase family. IspD
CC       subfamily. {ECO:0000255|HAMAP-Rule:MF_00108}.
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DR   EMBL; CP001104; ACR71417.1; -; Genomic_DNA.
DR   RefSeq; WP_012738654.1; NC_012778.1.
DR   AlphaFoldDB; C4Z312; -.
DR   SMR; C4Z312; -.
DR   STRING; 515620.EUBELI_00381; -.
DR   EnsemblBacteria; ACR71417; ACR71417; EUBELI_00381.
DR   GeneID; 41355152; -.
DR   KEGG; eel:EUBELI_00381; -.
DR   eggNOG; COG1211; Bacteria.
DR   HOGENOM; CLU_061281_2_2_9; -.
DR   OMA; ERQHSVY; -.
DR   OrthoDB; 1836139at2; -.
DR   UniPathway; UPA00056; UER00093.
DR   Proteomes; UP000001476; Chromosome.
DR   GO; GO:0050518; F:2-C-methyl-D-erythritol 4-phosphate cytidylyltransferase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0019288; P:isopentenyl diphosphate biosynthetic process, methylerythritol 4-phosphate pathway; IEA:UniProtKB-UniPathway.
DR   GO; GO:0016114; P:terpenoid biosynthetic process; IEA:UniProtKB-UniRule.
DR   CDD; cd02516; CDP-ME_synthetase; 1.
DR   Gene3D; 3.90.550.10; -; 1.
DR   HAMAP; MF_00108; IspD; 1.
DR   InterPro; IPR001228; IspD.
DR   InterPro; IPR034683; IspD/TarI.
DR   InterPro; IPR029044; Nucleotide-diphossugar_trans.
DR   Pfam; PF01128; IspD; 1.
DR   SUPFAM; SSF53448; SSF53448; 1.
DR   TIGRFAMs; TIGR00453; ispD; 1.
PE   3: Inferred from homology;
KW   Isoprene biosynthesis; Nucleotidyltransferase; Reference proteome;
KW   Transferase.
FT   CHAIN           1..227
FT                   /note="2-C-methyl-D-erythritol 4-phosphate
FT                   cytidylyltransferase"
FT                   /id="PRO_1000202892"
FT   SITE            14
FT                   /note="Transition state stabilizer"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00108"
FT   SITE            21
FT                   /note="Transition state stabilizer"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00108"
FT   SITE            152
FT                   /note="Positions MEP for the nucleophilic attack"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00108"
FT   SITE            211
FT                   /note="Positions MEP for the nucleophilic attack"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00108"
SQ   SEQUENCE   227 AA;  25421 MW;  44BEC2485B1B70F4 CRC64;
     MNTAIVLAGG SGKRMHSEIP KQYMQLNGKP VIYYSLKAFE ESEHVDEIIL VTAKEYIEYV
     RNEIAGSQFA KLTKIIEGGK ERFDSVWAGL QQISEKGYVY IHDGARPCIN QNIINACWET
     VVQTDACVAA APVKDTIKVA DADEYAINTP DRKTLWQIQT PQVFSADVIK EAYSRLYEQN
     CFDGVTDDAM VVERYGNSKI KLVNCGYCNI KITTPEDMEI AGIFLKG