ID   HEM2_CHLTR              Reviewed;         338 AA.
AC   O84638;
DT   11-JAN-2001, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1998, sequence version 1.
DT   03-AUG-2022, entry version 105.
DE   RecName: Full=Delta-aminolevulinic acid dehydratase;
DE            Short=ALAD;
DE            Short=ALADH;
DE            EC=4.2.1.24;
DE   AltName: Full=Porphobilinogen synthase;
GN   Name=hemB; OrderedLocusNames=CT_633;
OS   Chlamydia trachomatis (strain D/UW-3/Cx).
OC   Bacteria; Chlamydiae; Chlamydiales; Chlamydiaceae;
OC   Chlamydia/Chlamydophila group; Chlamydia.
OX   NCBI_TaxID=272561;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=D/UW-3/Cx;
RX   PubMed=9784136; DOI=10.1126/science.282.5389.754;
RA   Stephens R.S., Kalman S., Lammel C.J., Fan J., Marathe R., Aravind L.,
RA   Mitchell W.P., Olinger L., Tatusov R.L., Zhao Q., Koonin E.V., Davis R.W.;
RT   "Genome sequence of an obligate intracellular pathogen of humans: Chlamydia
RT   trachomatis.";
RL   Science 282:754-759(1998).
CC   -!- FUNCTION: Catalyzes an early step in the biosynthesis of tetrapyrroles.
CC       Binds two molecules of 5-aminolevulinate per subunit, each at a
CC       distinct site, and catalyzes their condensation to form porphobilinogen
CC       (By similarity). {ECO:0000250}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=2 5-aminolevulinate = H(+) + 2 H2O + porphobilinogen;
CC         Xref=Rhea:RHEA:24064, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:58126, ChEBI:CHEBI:356416; EC=4.2.1.24;
CC   -!- PATHWAY: Porphyrin-containing compound metabolism; protoporphyrin-IX
CC       biosynthesis; coproporphyrinogen-III from 5-aminolevulinate: step 1/4.
CC   -!- SUBUNIT: Homooctamer. {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the ALAD family. {ECO:0000305}.
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DR   EMBL; AE001273; AAC68237.1; -; Genomic_DNA.
DR   PIR; E71489; E71489.
DR   RefSeq; NP_220150.1; NC_000117.1.
DR   RefSeq; WP_010725283.1; NC_000117.1.
DR   AlphaFoldDB; O84638; -.
DR   SMR; O84638; -.
DR   STRING; 813.O172_03470; -.
DR   EnsemblBacteria; AAC68237; AAC68237; CT_633.
DR   GeneID; 884414; -.
DR   KEGG; ctr:CT_633; -.
DR   PATRIC; fig|272561.5.peg.693; -.
DR   HOGENOM; CLU_035731_0_0_0; -.
DR   InParanoid; O84638; -.
DR   OMA; YQMDYAN; -.
DR   UniPathway; UPA00251; UER00318.
DR   Proteomes; UP000000431; Chromosome.
DR   GO; GO:0005829; C:cytosol; IBA:GO_Central.
DR   GO; GO:0004655; F:porphobilinogen synthase activity; IBA:GO_Central.
DR   GO; GO:0008270; F:zinc ion binding; IBA:GO_Central.
DR   GO; GO:0006783; P:heme biosynthetic process; IBA:GO_Central.
DR   GO; GO:0006782; P:protoporphyrinogen IX biosynthetic process; IEA:UniProtKB-UniPathway.
DR   Gene3D; 3.20.20.70; -; 1.
DR   InterPro; IPR001731; ALAD.
DR   InterPro; IPR030656; ALAD_AS.
DR   InterPro; IPR013785; Aldolase_TIM.
DR   PANTHER; PTHR11458; PTHR11458; 1.
DR   Pfam; PF00490; ALAD; 1.
DR   PIRSF; PIRSF001415; Porphbilin_synth; 1.
DR   PRINTS; PR00144; DALDHYDRTASE.
DR   SMART; SM01004; ALAD; 1.
DR   PROSITE; PS00169; D_ALA_DEHYDRATASE; 1.
PE   3: Inferred from homology;
KW   Heme biosynthesis; Lyase; Magnesium; Metal-binding; Porphyrin biosynthesis;
KW   Reference proteome.
FT   CHAIN           1..338
FT                   /note="Delta-aminolevulinic acid dehydratase"
FT                   /id="PRO_0000140498"
FT   ACT_SITE        199
FT                   /note="Schiff-base intermediate with substrate"
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        252
FT                   /note="Schiff-base intermediate with substrate"
FT                   /evidence="ECO:0000250"
FT   BINDING         209
FT                   /ligand="5-aminolevulinate"
FT                   /ligand_id="ChEBI:CHEBI:356416"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000250"
FT   BINDING         221
FT                   /ligand="5-aminolevulinate"
FT                   /ligand_id="ChEBI:CHEBI:356416"
FT                   /ligand_label="1"
FT                   /evidence="ECO:0000250"
FT   BINDING         237
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000250"
FT   BINDING         278
FT                   /ligand="5-aminolevulinate"
FT                   /ligand_id="ChEBI:CHEBI:356416"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000250"
FT   BINDING         317
FT                   /ligand="5-aminolevulinate"
FT                   /ligand_id="ChEBI:CHEBI:356416"
FT                   /ligand_label="2"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   338 AA;  37737 MW;  83E928F68EAA63FB CRC64;
     MIRLPLLKRP RRNRKSAAVR SIIQETQLCS SDLIWPIFLK DGSGIREEIK SMPGVYRWSL
     DMVSKELERL CTIGLKAVIL FPVIDANKKE QFGSYASHPY NIVCKGIQAI KKSFPELCVI
     SDIALDPFTT SGHDGIFHNN YVINDESVRV YGGIAVMHAE MGADIVAPSD MMDGRVKHIR
     EQMDQMGFVN TGILSYSAKY ASALYGPFRD ALSSHLQSGD KRTYQMDPAN VQEALLECQL
     DEEEGADMVM IKPAGFYLDV IVKARENTHL PVVAYQVSGE FSMIMAACLH GWLNKESVIK
     ESLLAIKRAG ATAIISYATP WVLEWLAKDA LPFERSVL