ID   GLGS_SPIOL              Reviewed;          14 AA.
AC   P55235;
DT   01-OCT-1996, integrated into UniProtKB/Swiss-Prot.
DT   01-OCT-1996, sequence version 1.
DT   11-DEC-2019, entry version 64.
DE   RecName: Full=Glucose-1-phosphate adenylyltransferase small subunit;
DE            EC=2.7.7.27;
DE   AltName: Full=ADP-glucose pyrophosphorylase;
DE   AltName: Full=ADP-glucose synthase;
DE   AltName: Full=AGPase B;
DE   AltName: Full=Alpha-D-glucose-1-phosphate adenyl transferase;
DE   Flags: Fragment;
OS   Spinacia oleracea (Spinach).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   Caryophyllales; Chenopodiaceae; Chenopodioideae; Anserineae; Spinacia.
OX   NCBI_TaxID=3562;
RN   [1]
RP   PROTEIN SEQUENCE.
RC   TISSUE=Leaf;
RX   PubMed=16665654; DOI=10.1104/pp.85.1.182;
RA   Morell M.K., Bloom M., Knowles V., Preiss J.;
RT   "Subunit structure of spinach leaf ADPglucose pyrophosphorylase.";
RL   Plant Physiol. 85:182-187(1987).
CC   -!- FUNCTION: This protein plays a role in synthesis of starch. It
CC       catalyzes the synthesis of the activated glycosyl donor, ADP-glucose
CC       from Glc-1-P and ATP.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=alpha-D-glucose 1-phosphate + ATP + H(+) = ADP-alpha-D-glucose
CC         + diphosphate; Xref=Rhea:RHEA:12120, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:30616, ChEBI:CHEBI:33019, ChEBI:CHEBI:57498,
CC         ChEBI:CHEBI:58601; EC=2.7.7.27;
CC   -!- ACTIVITY REGULATION: Activated by 3'phosphoglycerate, inhibited by
CC       orthophosphate. Allosteric regulation.
CC   -!- PATHWAY: Glycan biosynthesis; starch biosynthesis.
CC   -!- SUBUNIT: Heterotetramer.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast. Plastid, amyloplast.
CC       Note=Found in the chloroplast in leaf. Found in the plastid in the
CC       developing endosperm.
CC   -!- SIMILARITY: Belongs to the bacterial/plant glucose-1-phosphate
CC       adenylyltransferase family. {ECO:0000305}.
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DR   UniPathway; UPA00152; -.
DR   GO; GO:0009501; C:amyloplast; IEA:UniProtKB-SubCell.
DR   GO; GO:0009507; C:chloroplast; IEA:UniProtKB-SubCell.
DR   GO; GO:0005524; F:ATP binding; IEA:UniProtKB-KW.
DR   GO; GO:0008878; F:glucose-1-phosphate adenylyltransferase activity; IEA:UniProtKB-EC.
DR   GO; GO:0019252; P:starch biosynthetic process; IEA:UniProtKB-UniPathway.
PE   1: Evidence at protein level;
KW   Allosteric enzyme; Amyloplast; ATP-binding; Chloroplast;
KW   Direct protein sequencing; Nucleotide-binding; Nucleotidyltransferase;
KW   Plastid; Starch biosynthesis; Transferase.
FT   CHAIN           1..>14
FT                   /note="Glucose-1-phosphate adenylyltransferase small
FT                   subunit"
FT                   /id="PRO_0000195355"
FT   NON_TER         14
SQ   SEQUENCE   14 AA;  1490 MW;  98B5792C3AE738C5 CRC64;
     VSDSQNSQDG LDPE