ID   ECTC_RHOE4              Reviewed;         132 AA.
AC   C1A1L0;
DT   22-SEP-2009, integrated into UniProtKB/Swiss-Prot.
DT   26-MAY-2009, sequence version 1.
DT   25-MAY-2022, entry version 62.
DE   RecName: Full=L-ectoine synthase {ECO:0000255|HAMAP-Rule:MF_01255};
DE            EC=4.2.1.108 {ECO:0000255|HAMAP-Rule:MF_01255};
DE   AltName: Full=N-acetyldiaminobutyrate dehydratase {ECO:0000255|HAMAP-Rule:MF_01255};
GN   Name=ectC {ECO:0000255|HAMAP-Rule:MF_01255}; OrderedLocusNames=RER_37870;
OS   Rhodococcus erythropolis (strain PR4 / NBRC 100887).
OC   Bacteria; Actinobacteria; Corynebacteriales; Nocardiaceae; Rhodococcus;
OC   Rhodococcus erythropolis group.
OX   NCBI_TaxID=234621;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PR4 / NBRC 100887;
RA   Takarada H., Sekine M., Hosoyama A., Yamada R., Fujisawa T., Omata S.,
RA   Shimizu A., Tsukatani N., Tanikawa S., Fujita N., Harayama S.;
RT   "Comparison of the complete genome sequences of Rhodococcus erythropolis
RT   PR4 and Rhodococcus opacus B4.";
RL   Submitted (MAR-2005) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Catalyzes the circularization of gamma-N-acetyl-alpha,gamma-
CC       diaminobutyric acid (ADABA) to ectoine (1,4,5,6-tetrahydro-2-methyl-4-
CC       pyrimidine carboxylic acid), which is an excellent osmoprotectant.
CC       {ECO:0000255|HAMAP-Rule:MF_01255}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=(2S)-4-acetamido-2-aminobutanoate = H2O + L-ectoine;
CC         Xref=Rhea:RHEA:17281, ChEBI:CHEBI:15377, ChEBI:CHEBI:58515,
CC         ChEBI:CHEBI:58929; EC=4.2.1.108; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_01255};
CC   -!- PATHWAY: Amine and polyamine biosynthesis; ectoine biosynthesis; L-
CC       ectoine from L-aspartate 4-semialdehyde: step 3/3. {ECO:0000255|HAMAP-
CC       Rule:MF_01255}.
CC   -!- SIMILARITY: Belongs to the ectoine synthase family. {ECO:0000255|HAMAP-
CC       Rule:MF_01255}.
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DR   EMBL; AP008957; BAH34495.1; -; Genomic_DNA.
DR   RefSeq; WP_003944463.1; NC_012490.1.
DR   AlphaFoldDB; C1A1L0; -.
DR   SMR; C1A1L0; -.
DR   STRING; 234621.RER_37870; -.
DR   EnsemblBacteria; BAH34495; BAH34495; RER_37870.
DR   GeneID; 64141570; -.
DR   KEGG; rer:RER_37870; -.
DR   eggNOG; COG1917; Bacteria.
DR   HOGENOM; CLU_154525_0_0_11; -.
DR   OMA; CVFNPPI; -.
DR   UniPathway; UPA00067; UER00123.
DR   Proteomes; UP000002204; Chromosome.
DR   GO; GO:0033990; F:ectoine synthase activity; IEA:UniProtKB-EC.
DR   GO; GO:0019491; P:ectoine biosynthetic process; IEA:UniProtKB-UniRule.
DR   CDD; cd06978; cupin_EctC; 1.
DR   Gene3D; 2.60.120.10; -; 1.
DR   HAMAP; MF_01255; Ectoine_synth; 1.
DR   InterPro; IPR010462; Ectoine_synth.
DR   InterPro; IPR014710; RmlC-like_jellyroll.
DR   InterPro; IPR011051; RmlC_Cupin_sf.
DR   PANTHER; PTHR39289; PTHR39289; 1.
DR   Pfam; PF06339; Ectoine_synth; 1.
DR   SUPFAM; SSF51182; SSF51182; 1.
PE   3: Inferred from homology;
KW   Lyase.
FT   CHAIN           1..132
FT                   /note="L-ectoine synthase"
FT                   /id="PRO_1000214118"
SQ   SEQUENCE   132 AA;  14941 MW;  8518FC347D5FC2EB CRC64;
     MIVRTTTEIT DTDRDITSED GNWRSKRIVL GGDRVGFSFH ETTIKAGSVN EFHYANHVEA
     VWLVEGTGKL IDLDNNKEYD LAPGSMYLLN GHERHRVEPD TQMRMLCVFN PPVTGREVHD
     ENGVYPLVEV PA