ID   GLNA2_EMIHU             Reviewed;          25 AA.
AC   P81643;
DT   31-AUG-2004, integrated into UniProtKB/Swiss-Prot.
DT   01-JUN-2001, sequence version 1.
DT   03-AUG-2022, entry version 40.
DE   RecName: Full=Glutamine synthetase 2 isozyme;
DE            EC=6.3.1.2;
DE   AltName: Full=Chloroplast GS2;
DE   AltName: Full=Glutamate--ammonia ligase;
DE   Flags: Fragment;
OS   Emiliania huxleyi (Coccolithophore) (Pontosphaera huxleyi).
OC   Eukaryota; Haptista; Haptophyta; Prymnesiophyceae; Isochrysidales;
OC   Noelaerhabdaceae; Emiliania.
OX   NCBI_TaxID=2903;
RN   [1] {ECO:0000305}
RP   PROTEIN SEQUENCE, FUNCTION, AND SUBUNIT.
RC   STRAIN=CCAP 920/2 / F61 {ECO:0000269|Ref.1};
RA   Maurin C., Le Gal Y.;
RT   "Isoforms of glutamine synthetase in the marine coccolithophorid Emiliania
RT   huxleyi (Prymnesiophyceae).";
RL   Comp. Biochem. Physiol. 118B:903-912(1997).
CC   -!- FUNCTION: Plays a key role in the nitrogen metabolism of
CC       microorganisms, animals and plants. {ECO:0000269|Ref.1}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=ATP + L-glutamate + NH4(+) = ADP + H(+) + L-glutamine +
CC         phosphate; Xref=Rhea:RHEA:16169, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:28938, ChEBI:CHEBI:29985, ChEBI:CHEBI:30616,
CC         ChEBI:CHEBI:43474, ChEBI:CHEBI:58359, ChEBI:CHEBI:456216; EC=6.3.1.2;
CC         Evidence={ECO:0000305};
CC   -!- SUBUNIT: Homohexamer. {ECO:0000269|Ref.1}.
CC   -!- SUBCELLULAR LOCATION: Plastid, chloroplast {ECO:0000305}.
CC   -!- SIMILARITY: Belongs to the glutamine synthetase family. {ECO:0000305}.
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DR   Proteomes; UP000013827; Unassembled WGS sequence.
DR   GO; GO:0009507; C:chloroplast; IEA:UniProtKB-SubCell.
DR   GO; GO:0005524; F:ATP binding; IEA:UniProtKB-KW.
DR   GO; GO:0004356; F:glutamate-ammonia ligase activity; IEA:UniProtKB-EC.
PE   1: Evidence at protein level;
KW   ATP-binding; Chloroplast; Direct protein sequencing; Ligase;
KW   Nitrogen fixation; Nucleotide-binding; Plastid; Reference proteome.
FT   CHAIN           1..>25
FT                   /note="Glutamine synthetase 2 isozyme"
FT                   /id="PRO_0000153172"
FT   NON_TER         25
FT                   /evidence="ECO:0000303|Ref.1"
SQ   SEQUENCE   25 AA;  2677 MW;  F7C9FCFE791435B3 CRC64;
     XIAGSEEYGK HCFKGAVADA YLAKH