ID   DCAM2_BRAJU             Reviewed;         369 AA.
AC   O49972;
DT   15-DEC-1998, integrated into UniProtKB/Swiss-Prot.
DT   01-JUN-1998, sequence version 1.
DT   25-MAY-2022, entry version 87.
DE   RecName: Full=S-adenosylmethionine decarboxylase proenzyme 2;
DE            Short=AdoMetDC 2;
DE            Short=SAMDC 2;
DE            EC=4.1.1.50;
DE   Contains:
DE     RecName: Full=S-adenosylmethionine decarboxylase 2 alpha chain;
DE   Contains:
DE     RecName: Full=S-adenosylmethionine decarboxylase 2 beta chain;
DE   Flags: Precursor;
GN   Name=SAMDC2;
OS   Brassica juncea (Indian mustard) (Sinapis juncea).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   rosids; malvids; Brassicales; Brassicaceae; Brassiceae; Brassica.
OX   NCBI_TaxID=3707;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [MRNA].
RA   Lee T., Liu J.-J., Pua E.-C.;
RT   "Molecular cloning of two cDNAs encoding S-adenosyl-L-methionine
RT   decarboxylase in mustard (Brassica juncea [L.] Czern & Coss).";
RL   (er) Plant Gene Register PGR97-157(1997).
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=H(+) + S-adenosyl-L-methionine = CO2 + S-adenosyl 3-
CC         (methylsulfanyl)propylamine; Xref=Rhea:RHEA:15981, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:16526, ChEBI:CHEBI:57443, ChEBI:CHEBI:59789; EC=4.1.1.50;
CC   -!- COFACTOR:
CC       Name=pyruvate; Xref=ChEBI:CHEBI:15361; Evidence={ECO:0000250};
CC       Note=Binds 1 pyruvoyl group covalently per subunit. {ECO:0000250};
CC   -!- PATHWAY: Amine and polyamine biosynthesis; S-adenosylmethioninamine
CC       biosynthesis; S-adenosylmethioninamine from S-adenosyl-L-methionine:
CC       step 1/1.
CC   -!- PTM: Is synthesized initially as an inactive proenzyme. Formation of
CC       the active enzyme involves a self-maturation process in which the
CC       active site pyruvoyl group is generated from an internal serine residue
CC       via an autocatalytic post-translational modification. Two non-identical
CC       subunits are generated from the proenzyme in this reaction, and the
CC       pyruvate is formed at the N-terminus of the alpha chain, which is
CC       derived from the carboxyl end of the proenzyme. The post-translation
CC       cleavage follows an unusual pathway, termed non-hydrolytic serinolysis,
CC       in which the side chain hydroxyl group of the serine supplies its
CC       oxygen atom to form the C-terminus of the beta chain, while the
CC       remainder of the serine residue undergoes an oxidative deamination to
CC       produce ammonia and the pyruvoyl group blocking the N-terminus of the
CC       alpha chain (By similarity). {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the eukaryotic AdoMetDC family. {ECO:0000305}.
CC   ---------------------------------------------------------------------------
CC   Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC   Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC   ---------------------------------------------------------------------------
DR   EMBL; U80916; AAB88273.1; -; mRNA.
DR   PIR; T10750; T10750.
DR   AlphaFoldDB; O49972; -.
DR   SMR; O49972; -.
DR   BRENDA; 4.1.1.50; 941.
DR   UniPathway; UPA00331; UER00451.
DR   GO; GO:0004014; F:adenosylmethionine decarboxylase activity; IEA:UniProtKB-EC.
DR   GO; GO:0006557; P:S-adenosylmethioninamine biosynthetic process; IEA:UniProtKB-UniPathway.
DR   GO; GO:0008295; P:spermidine biosynthetic process; IEA:UniProtKB-KW.
DR   GO; GO:0006597; P:spermine biosynthetic process; IEA:InterPro.
DR   InterPro; IPR001985; S-AdoMet_decarboxylase.
DR   InterPro; IPR016067; S-AdoMet_deCO2ase_core.
DR   InterPro; IPR018166; S-AdoMet_deCO2ase_CS.
DR   PANTHER; PTHR11570; PTHR11570; 1.
DR   Pfam; PF01536; SAM_decarbox; 1.
DR   PIRSF; PIRSF001355; S-AdenosylMet_decarboxylase; 1.
DR   SUPFAM; SSF56276; SSF56276; 1.
DR   TIGRFAMs; TIGR00535; SAM_DCase; 1.
DR   PROSITE; PS01336; ADOMETDC; 1.
PE   2: Evidence at transcript level;
KW   Autocatalytic cleavage; Decarboxylase; Lyase; Polyamine biosynthesis;
KW   Pyruvate; S-adenosyl-L-methionine; Schiff base; Spermidine biosynthesis;
KW   Zymogen.
FT   CHAIN           1..68
FT                   /note="S-adenosylmethionine decarboxylase 2 beta chain"
FT                   /evidence="ECO:0000250"
FT                   /id="PRO_0000029993"
FT   CHAIN           69..369
FT                   /note="S-adenosylmethionine decarboxylase 2 alpha chain"
FT                   /evidence="ECO:0000250"
FT                   /id="PRO_0000029994"
FT   ACT_SITE        9
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        12
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        69
FT                   /note="Schiff-base intermediate with substrate; via pyruvic
FT                   acid"
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        83
FT                   /note="Proton donor; for catalytic activity"
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        236
FT                   /note="Proton acceptor; for processing activity"
FT                   /evidence="ECO:0000250"
FT   ACT_SITE        249
FT                   /note="Proton acceptor; for processing activity"
FT                   /evidence="ECO:0000250"
FT   SITE            68..69
FT                   /note="Cleavage (non-hydrolytic); by autolysis"
FT                   /evidence="ECO:0000250"
FT   MOD_RES         69
FT                   /note="Pyruvic acid (Ser); by autocatalysis"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   369 AA;  40628 MW;  9341292F86801073 CRC64;
     MSVSAIGFEG YEKRLEVSFF EPSLFVDTHG KGLRALPKSQ IDEILAPAEC TIVSSLSNDE
     LDSYVLSESS LFIFPYKIII KTCGTTKLLP SIEPLLRLAG ELSLEVKSVR YTRGSFLCPG
     GQPFPHRNFS EEVSVLDGHF AKMGLSSVAY LMGDDDETKK WHVYSASAPA RNGNGNNNNN
     VYTLEMCMTG LDKEKASVFY KNESSSAGSM TDNSGIRKIL PQSQICDFEF EPCGYSMNSV
     EGDAISTIHV TPEDGFSYAS FEAVGYDFTT MDLSHLVSKV LTCFEPKQFS VAVHSSVAQK
     SYDSGLSVDL EDYGCRETTI ELLGEERGTV MYQSFEKLGR YCGSPRSTLK CEWSSSSSCT
     SEDEKEEGI