DCAM_PEA
ID DCAM_PEA Reviewed; 353 AA.
AC Q43820;
DT 15-DEC-1998, integrated into UniProtKB/Swiss-Prot.
DT 01-NOV-1996, sequence version 1.
DT 25-MAY-2022, entry version 91.
DE RecName: Full=S-adenosylmethionine decarboxylase proenzyme;
DE Short=AdoMetDC;
DE Short=SAMDC;
DE EC=4.1.1.50;
DE Contains:
DE RecName: Full=S-adenosylmethionine decarboxylase alpha chain;
DE Contains:
DE RecName: Full=S-adenosylmethionine decarboxylase beta chain;
DE Flags: Precursor;
GN Name=SAMDC;
OS Pisum sativum (Garden pea).
OC Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC rosids; fabids; Fabales; Fabaceae; Papilionoideae; 50 kb inversion clade;
OC NPAAA clade; Hologalegina; IRL clade; Fabeae; Pisum.
OX NCBI_TaxID=3888;
RN [1]
RP NUCLEOTIDE SEQUENCE [MRNA].
RC STRAIN=cv. Alaska;
RX PubMed=11925048; DOI=10.1007/s004250100653;
RA Marco F., Carrasco P.;
RT "Expression of the pea S-adenosylmethionine decarboxylase gene is involved
RT in developmental and environmental responses.";
RL Planta 214:641-647(2002).
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}.
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DR EMBL; U60592; AAB03865.1; -; mRNA.
DR PIR; T06515; T06515.
DR AlphaFoldDB; Q43820; -.
DR SMR; Q43820; -.
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 beta chain"
FT /evidence="ECO:0000250"
FT /id="PRO_0000030019"
FT CHAIN 69..353
FT /note="S-adenosylmethionine decarboxylase alpha chain"
FT /evidence="ECO:0000250"
FT /id="PRO_0000030020"
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 232
FT /note="Proton acceptor; for processing activity"
FT /evidence="ECO:0000250"
FT ACT_SITE 245
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 353 AA; 38683 MW; 51FACD264FEBD30B CRC64;
MAVSAIGFEG FEKRLEISFS DPGLFSDPQG RGLRSLTKSQ LDEILAPAEC TIVSSLANED
VDSYVLSESS LFVYAYKLII KTCGTTKLLL SIPPILKLAD SISLNVRSVR YTRGSFIFPG
AQSFPHRHFS EEVAVLDGFF GKLGSGSMAY ILGGSDEAQN WHIYCASSDS VSPEGSVYTL
EMCMTGLDRE KASVFFKEQT GSAAEMTVNS GIRKILRNSE ICDFDFEPCG YSMNSVEGSA
VSTIHITPED GFSYASFETA GYDLKAINLN EMVMRVLACF QPTEFSVAVH VDNASKSFEQ
GCLLDVKGYC CEEKSHQGLG MSGSVVYQKF LKTSYCGSPR STLKCWKDED EEE