ID   SPEE_HELAH              Reviewed;         262 AA.
AC   Q17WL9;
DT   15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT   25-JUL-2006, sequence version 1.
DT   03-AUG-2022, entry version 93.
DE   RecName: Full=Polyamine aminopropyltransferase {ECO:0000255|HAMAP-Rule:MF_00198};
DE   AltName: Full=Putrescine aminopropyltransferase {ECO:0000255|HAMAP-Rule:MF_00198};
DE            Short=PAPT {ECO:0000255|HAMAP-Rule:MF_00198};
DE   AltName: Full=Spermidine synthase {ECO:0000255|HAMAP-Rule:MF_00198};
DE            Short=SPDS {ECO:0000255|HAMAP-Rule:MF_00198};
DE            Short=SPDSY {ECO:0000255|HAMAP-Rule:MF_00198};
DE            EC=2.5.1.16 {ECO:0000255|HAMAP-Rule:MF_00198};
GN   Name=speE {ECO:0000255|HAMAP-Rule:MF_00198}; OrderedLocusNames=Hac_1202;
OS   Helicobacter acinonychis (strain Sheeba).
OC   Bacteria; Proteobacteria; Epsilonproteobacteria; Campylobacterales;
OC   Helicobacteraceae; Helicobacter.
OX   NCBI_TaxID=382638;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=Sheeba;
RX   PubMed=16789826; DOI=10.1371/journal.pgen.0020120;
RA   Eppinger M., Baar C., Linz B., Raddatz G., Lanz C., Keller H., Morelli G.,
RA   Gressmann H., Achtman M., Schuster S.C.;
RT   "Who ate whom? Adaptive Helicobacter genomic changes that accompanied a
RT   host jump from early humans to large felines.";
RL   PLoS Genet. 2:1097-1110(2006).
CC   -!- FUNCTION: Catalyzes the irreversible transfer of a propylamine group
CC       from the amino donor S-adenosylmethioninamine (decarboxy-AdoMet) to
CC       putrescine (1,4-diaminobutane) to yield spermidine. {ECO:0000255|HAMAP-
CC       Rule:MF_00198}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=putrescine + S-adenosyl 3-(methylsulfanyl)propylamine = H(+) +
CC         S-methyl-5'-thioadenosine + spermidine; Xref=Rhea:RHEA:12721,
CC         ChEBI:CHEBI:15378, ChEBI:CHEBI:17509, ChEBI:CHEBI:57443,
CC         ChEBI:CHEBI:57834, ChEBI:CHEBI:326268; EC=2.5.1.16;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00198};
CC   -!- PATHWAY: Amine and polyamine biosynthesis; spermidine biosynthesis;
CC       spermidine from putrescine: step 1/1. {ECO:0000255|HAMAP-
CC       Rule:MF_00198}.
CC   -!- SUBUNIT: Homodimer or homotetramer. {ECO:0000255|HAMAP-Rule:MF_00198}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_00198}.
CC   -!- SIMILARITY: Belongs to the spermidine/spermine synthase family.
CC       {ECO:0000255|HAMAP-Rule:MF_00198}.
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DR   EMBL; AM260522; CAJ99957.1; -; Genomic_DNA.
DR   RefSeq; WP_011578064.1; NC_008229.1.
DR   AlphaFoldDB; Q17WL9; -.
DR   SMR; Q17WL9; -.
DR   STRING; 382638.Hac_1202; -.
DR   EnsemblBacteria; CAJ99957; CAJ99957; Hac_1202.
DR   KEGG; hac:Hac_1202; -.
DR   eggNOG; COG0421; Bacteria.
DR   HOGENOM; CLU_048199_0_0_7; -.
DR   OMA; EYTIEAK; -.
DR   OrthoDB; 1613081at2; -.
DR   BioCyc; HACI382638:HAC_RS05180-MON; -.
DR   UniPathway; UPA00248; UER00314.
DR   Proteomes; UP000000775; Chromosome.
DR   GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR   GO; GO:0004766; F:spermidine synthase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0008295; P:spermidine biosynthetic process; IEA:UniProtKB-UniRule.
DR   Gene3D; 2.30.140.10; -; 1.
DR   Gene3D; 3.40.50.150; -; 1.
DR   HAMAP; MF_00198; Spermidine_synth; 1.
DR   InterPro; IPR030374; PABS.
DR   InterPro; IPR029063; SAM-dependent_MTases_sf.
DR   InterPro; IPR001045; Spermi_synthase.
DR   InterPro; IPR035246; Spermidine_synt_N.
DR   InterPro; IPR037163; Spermidine_synt_N_sf.
DR   PANTHER; PTHR11558; PTHR11558; 1.
DR   Pfam; PF17284; Spermine_synt_N; 1.
DR   SUPFAM; SSF53335; SSF53335; 1.
DR   PROSITE; PS51006; PABS_2; 1.
PE   3: Inferred from homology;
KW   Cytoplasm; Polyamine biosynthesis; Spermidine biosynthesis; Transferase.
FT   CHAIN           1..262
FT                   /note="Polyamine aminopropyltransferase"
FT                   /id="PRO_1000012001"
FT   DOMAIN          1..249
FT                   /note="PABS"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00198"
FT   ACT_SITE        155
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00198"
FT   BINDING         29
FT                   /ligand="S-methyl-5'-thioadenosine"
FT                   /ligand_id="ChEBI:CHEBI:17509"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00198"
FT   BINDING         83
FT                   /ligand="spermidine"
FT                   /ligand_id="ChEBI:CHEBI:57834"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00198"
SQ   SEQUENCE   262 AA;  30358 MW;  BA97E8315C5B3024 CRC64;
     MWITQEITPY LRKEYTIEAK LLDVRSDHNI LEIFKSNDFG EIAMLNSQLL FKNFLHIESE
     LLAHMGGCTK KELKEVLIVD GFDLELAHQL FKYDTHVDFV QADEKILDSF ISFFPHFHGV
     KNNKNFTHAK QFLDLDIKKY DLIVCLQEPD KHKIDGLKRT LKEDGVFISV AKHPLLEHVS
     MQNALKNMGE FFSIVMPFVA PLRILSNKGY IYASLKTHPL KDLIAQKIEA LKNVGYYNED
     IHRAAFALPK NLQEILKENI KS