ID A0A4S4BQ41_9BACI Unreviewed; 276 AA.
AC A0A4S4BQ41;
DT 31-JUL-2019, integrated into UniProtKB/TrEMBL.
DT 31-JUL-2019, sequence version 1.
DT 18-JUN-2025, entry version 26.
DE RecName: Full=Polyamine aminopropyltransferase {ECO:0000256|HAMAP-Rule:MF_00198};
DE AltName: Full=Putrescine aminopropyltransferase {ECO:0000256|HAMAP-Rule:MF_00198};
DE Short=PAPT {ECO:0000256|HAMAP-Rule:MF_00198};
DE AltName: Full=Spermidine synthase {ECO:0000256|HAMAP-Rule:MF_00198};
DE Short=SPDS {ECO:0000256|HAMAP-Rule:MF_00198};
DE Short=SPDSY {ECO:0000256|HAMAP-Rule:MF_00198};
DE EC=2.5.1.16 {ECO:0000256|HAMAP-Rule:MF_00198};
GN Name=speE {ECO:0000256|HAMAP-Rule:MF_00198,
GN ECO:0000313|EMBL:THF77037.1};
GN ORFNames=E6W99_20355 {ECO:0000313|EMBL:THF77037.1};
OS Metabacillus sediminilitoris.
OC Bacteria; Bacillati; Bacillota; Bacilli; Bacillales; Bacillaceae;
OC Metabacillus.
OX NCBI_TaxID=2567941 {ECO:0000313|EMBL:THF77037.1, ECO:0000313|Proteomes:UP000310334};
RN [1] {ECO:0000313|EMBL:THF77037.1, ECO:0000313|Proteomes:UP000310334}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=DSL-17 {ECO:0000313|EMBL:THF77037.1,
RC ECO:0000313|Proteomes:UP000310334};
RA Wei Y., Mao H., Fang J.;
RT "Bacillus sediminilitoris sp. nov., isolated from a tidal flat sediment on
RT the East China Sea.";
RL Submitted (APR-2019) to the EMBL/GenBank/DDBJ databases.
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:0000256|HAMAP-
CC Rule:MF_00198}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=S-adenosyl 3-(methylsulfanyl)propylamine + putrescine = S-
CC methyl-5'-thioadenosine + spermidine + H(+); 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:0000256|HAMAP-Rule:MF_00198,
CC ECO:0000256|RuleBase:RU003837};
CC -!- PATHWAY: Amine and polyamine biosynthesis; spermidine biosynthesis;
CC spermidine from putrescine: step 1/1. {ECO:0000256|HAMAP-
CC Rule:MF_00198}.
CC -!- SUBUNIT: Homodimer or homotetramer. {ECO:0000256|HAMAP-Rule:MF_00198}.
CC -!- SIMILARITY: Belongs to the spermidine/spermine synthase family.
CC {ECO:0000256|ARBA:ARBA00007867, ECO:0000256|HAMAP-Rule:MF_00198,
CC ECO:0000256|RuleBase:RU003836}.
CC -!- CAUTION: The sequence shown here is derived from an EMBL/GenBank/DDBJ
CC whole genome shotgun (WGS) entry which is preliminary data.
CC {ECO:0000313|EMBL:THF77037.1}.
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DR EMBL; SSNT01000017; THF77037.1; -; Genomic_DNA.
DR RefSeq; WP_136357225.1; NZ_CP046266.1.
DR AlphaFoldDB; A0A4S4BQ41; -.
DR OrthoDB; 9793120at2; -.
DR UniPathway; UPA00248; UER00314.
DR Proteomes; UP000310334; Unassembled WGS sequence.
DR GO; GO:0005829; C:cytosol; IEA:TreeGrafter.
DR GO; GO:0004766; F:spermidine synthase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0008295; P:spermidine biosynthetic process; IEA:UniProtKB-UniRule.
DR CDD; cd02440; AdoMet_MTases; 1.
DR FunFam; 3.40.50.150:FF:000056; Polyamine aminopropyltransferase; 1.
DR Gene3D; 2.30.140.10; Spermidine synthase, tetramerisation domain; 1.
DR Gene3D; 3.40.50.150; Vaccinia Virus protein VP39; 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 NCBIfam; NF037959; MFS_SpdSyn; 1.
DR NCBIfam; NF002010; PRK00811.1; 1.
DR NCBIfam; TIGR00417; speE; 1.
DR PANTHER; PTHR11558:SF11; SPERMIDINE SYNTHASE; 1.
DR PANTHER; PTHR11558; SPERMIDINE/SPERMINE SYNTHASE; 1.
DR Pfam; PF17284; Spermine_synt_N; 1.
DR Pfam; PF01564; Spermine_synth; 1.
DR SUPFAM; SSF53335; S-adenosyl-L-methionine-dependent methyltransferases; 1.
DR PROSITE; PS01330; PABS_1; 1.
DR PROSITE; PS51006; PABS_2; 1.
PE 3: Inferred from homology;
KW Cytoplasm {ECO:0000256|ARBA:ARBA00022490};
KW Polyamine biosynthesis {ECO:0000256|ARBA:ARBA00023115, ECO:0000256|HAMAP-
KW Rule:MF_00198}; Reference proteome {ECO:0000313|Proteomes:UP000310334};
KW Spermidine biosynthesis {ECO:0000256|ARBA:ARBA00023066, ECO:0000256|HAMAP-
KW Rule:MF_00198};
KW Transferase {ECO:0000256|ARBA:ARBA00022679, ECO:0000256|HAMAP-
KW Rule:MF_00198}.
FT ACT_SITE 156
FT /note="Proton acceptor"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00198"
FT BINDING 32
FT /ligand="S-methyl-5'-thioadenosine"
FT /ligand_id="ChEBI:CHEBI:17509"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00198"
FT BINDING 63
FT /ligand="spermidine"
FT /ligand_id="ChEBI:CHEBI:57834"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00198"
FT BINDING 87
FT /ligand="spermidine"
FT /ligand_id="ChEBI:CHEBI:57834"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00198"
FT BINDING 107
FT /ligand="S-methyl-5'-thioadenosine"
FT /ligand_id="ChEBI:CHEBI:17509"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00198"
FT BINDING 138..139
FT /ligand="S-methyl-5'-thioadenosine"
FT /ligand_id="ChEBI:CHEBI:17509"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00198"
FT BINDING 156..159
FT /ligand="spermidine"
FT /ligand_id="ChEBI:CHEBI:57834"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00198"
FT BINDING 163
FT /ligand="S-methyl-5'-thioadenosine"
FT /ligand_id="ChEBI:CHEBI:17509"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00198"
SQ SEQUENCE 276 AA; 31499 MW; 19056013EE69CD67 CRC64;
MSELWYTEKQ TKNFGITLKI KQTLHTEQTD FQYLEMVETE EFGNMLFLDG MVMTSQKDEF
VYHEMVAHVP LFTHPNPENV LVVGGGDGGV IREVLKHPQV KKATLVDIDG KVIEYSKKYL
PEIAGKLDDP RVEVKVGDGF MHIAESENEY DVIMVDSTEP MGPAVNLFTK GFYAGIAKAL
KEDGVFVAQT DNPWFTPELI TNVQRDVKEI FPITRLYTAN IPTYPSGLWT FTIGSKKYDP
LEVSEDRFHE IETKYYTKEL HKAAFVLPKF VSDLIK
//
