ID   SPEE_SULIK              Reviewed;         301 AA.
AC   C4KHC0;
DT   22-SEP-2009, integrated into UniProtKB/Swiss-Prot.
DT   07-JUL-2009, sequence version 1.
DT   03-AUG-2022, entry version 67.
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=M164_1378;
OS   Sulfolobus islandicus (strain M.16.4 / Kamchatka #3).
OC   Archaea; Crenarchaeota; Thermoprotei; Sulfolobales; Sulfolobaceae;
OC   Sulfolobus.
OX   NCBI_TaxID=426118;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=M.16.4 / Kamchatka #3;
RX   PubMed=19435847; DOI=10.1073/pnas.0808945106;
RA   Reno M.L., Held N.L., Fields C.J., Burke P.V., Whitaker R.J.;
RT   "Biogeography of the Sulfolobus islandicus pan-genome.";
RL   Proc. Natl. Acad. Sci. U.S.A. 106:8605-8610(2009).
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; CP001402; ACR41984.1; -; Genomic_DNA.
DR   RefSeq; WP_012711385.1; NC_012726.1.
DR   AlphaFoldDB; C4KHC0; -.
DR   SMR; C4KHC0; -.
DR   EnsemblBacteria; ACR41984; ACR41984; M164_1378.
DR   GeneID; 7814198; -.
DR   GeneID; 7939892; -.
DR   KEGG; sid:M164_1378; -.
DR   HOGENOM; CLU_048199_0_1_2; -.
DR   OMA; LWPGQSF; -.
DR   UniPathway; UPA00248; UER00314.
DR   Proteomes; UP000001479; 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; IPR030373; PABS_CS.
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   Pfam; PF17284; Spermine_synt_N; 1.
DR   SUPFAM; SSF53335; SSF53335; 1.
DR   PROSITE; PS01330; PABS_1; 1.
DR   PROSITE; PS51006; PABS_2; 1.
PE   3: Inferred from homology;
KW   Cytoplasm; Polyamine biosynthesis; Spermidine biosynthesis; Transferase.
FT   CHAIN           1..301
FT                   /note="Polyamine aminopropyltransferase"
FT                   /id="PRO_1000204078"
FT   DOMAIN          4..240
FT                   /note="PABS"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00198"
FT   ACT_SITE        159
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00198"
FT   BINDING         33
FT                   /ligand="S-methyl-5'-thioadenosine"
FT                   /ligand_id="ChEBI:CHEBI:17509"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00198"
FT   BINDING         64
FT                   /ligand="spermidine"
FT                   /ligand_id="ChEBI:CHEBI:57834"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00198"
FT   BINDING         89
FT                   /ligand="spermidine"
FT                   /ligand_id="ChEBI:CHEBI:57834"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00198"
FT   BINDING         109
FT                   /ligand="S-methyl-5'-thioadenosine"
FT                   /ligand_id="ChEBI:CHEBI:17509"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00198"
FT   BINDING         141..142
FT                   /ligand="S-methyl-5'-thioadenosine"
FT                   /ligand_id="ChEBI:CHEBI:17509"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00198"
SQ   SEQUENCE   301 AA;  34770 MW;  20898F705B55ED90 CRC64;
     MFGWHWLLEW QTPYEFHGHL IEKVFAEEKT PYQHVTLVEF TRFGKGLIID GKVQSTLYDE
     HIYHELLVHP LLLSLPKPPK NVLILGGGEG ATLREVLKYK SVEKAVMVDI DEKVIEFAKK
     YLYEWHQGAF EDKRTSLVIT DGLKFINETK DKYDAIILDL TDPIKDSTSY MLYTKEFYEK
     LRGILNQGGG IVTQATSPSF SLEVYVTIYN TIKEVFKEAS ASYTYMASFD GLWGFVYGGV
     RPDLLSEDEV NSRIRERISG QLRFYDDYSH KISFSLPKNI KSEFKKITKV STEKDPIYVP
     A