ID   SSG1_FAGES              Reviewed;          25 AA.
AC   P84633;
DT   27-SEP-2005, integrated into UniProtKB/Swiss-Prot.
DT   27-SEP-2005, sequence version 1.
DT   03-AUG-2022, entry version 38.
DE   RecName: Full=Granule-bound starch synthase 1, chloroplastic/amyloplastic;
DE            EC=2.4.1.242;
DE   AltName: Full=Granule-bound starch synthase I;
DE            Short=GBSS-I;
DE   Flags: Fragment;
OS   Fagopyrum esculentum (Common buckwheat) (Polygonum fagopyrum).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   Caryophyllales; Polygonaceae; Polygonoideae; Fagopyreae; Fagopyrum.
OX   NCBI_TaxID=3617;
RN   [1] {ECO:0000305}
RP   PROTEIN SEQUENCE, FUNCTION, CATALYTIC ACTIVITY, TISSUE SPECIFICITY, AND
RP   DEVELOPMENTAL STAGE.
RC   TISSUE=Endosperm {ECO:0000269|Ref.1};
RA   Chrungoo N.K., Paul N.;
RT   "N-terminal amino acid sequence of GBSS-I from grains of common buckwheat
RT   (Fagopyrum esculentum Moench).";
RL   Submitted (AUG-2005) to UniProtKB.
CC   -!- FUNCTION: Required for the synthesis of amylose in endosperm.
CC       {ECO:0000269|Ref.1}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=[(1->4)-alpha-D-glucosyl](n) + an NDP-alpha-D-glucose =
CC         [(1->4)-alpha-D-glucosyl](n+1) + a ribonucleoside 5'-diphosphate +
CC         H(+); Xref=Rhea:RHEA:15873, Rhea:RHEA-COMP:9584, Rhea:RHEA-COMP:9587,
CC         ChEBI:CHEBI:15378, ChEBI:CHEBI:15444, ChEBI:CHEBI:57930,
CC         ChEBI:CHEBI:76533; EC=2.4.1.242; Evidence={ECO:0000269|Ref.1};
CC   -!- PATHWAY: Glycan biosynthesis; starch biosynthesis.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast {ECO:0000250}. Plastid,
CC       amyloplast {ECO:0000250}. Note=Amyloplast or chloroplast, granule-
CC       bound. {ECO:0000250}.
CC   -!- TISSUE SPECIFICITY: Expressed in endosperm. {ECO:0000269|Ref.1}.
CC   -!- DEVELOPMENTAL STAGE: Expressed in grains from mid-maturation onwards.
CC       {ECO:0000269|Ref.1}.
CC   -!- SIMILARITY: Belongs to the glycosyltransferase 1 family.
CC       Bacterial/plant glycogen synthase subfamily. {ECO:0000255}.
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DR   AlphaFoldDB; P84633; -.
DR   UniPathway; UPA00152; -.
DR   GO; GO:0009501; C:amyloplast; IEA:UniProtKB-SubCell.
DR   GO; GO:0009507; C:chloroplast; IEA:UniProtKB-SubCell.
DR   GO; GO:0102502; F:ADP-glucose-starch glucosyltransferase activity; IEA:UniProtKB-EC.
DR   GO; GO:0019252; P:starch biosynthetic process; IEA:UniProtKB-UniPathway.
DR   InterPro; IPR013534; Starch_synth_cat_dom.
DR   Pfam; PF08323; Glyco_transf_5; 1.
PE   1: Evidence at protein level;
KW   Amyloplast; Chloroplast; Direct protein sequencing; Glycosyltransferase;
KW   Plastid; Starch biosynthesis; Transferase.
FT   CHAIN           1..>25
FT                   /note="Granule-bound starch synthase 1,
FT                   chloroplastic/amyloplastic"
FT                   /id="PRO_0000188669"
FT   BINDING         16
FT                   /ligand="ADP-alpha-D-glucose"
FT                   /ligand_id="ChEBI:CHEBI:57498"
FT                   /evidence="ECO:0000250|UniProtKB:P09842"
FT   NON_TER         25
FT                   /evidence="ECO:0000303|Ref.1"
SQ   SEQUENCE   25 AA;  2489 MW;  02A627C46ED85941 CRC64;
     GMNLVFVGAE VAPWSKTGGL GDVLA