ID   GLNA2_RHIML             Reviewed;         329 AA.
AC   P45626;
DT   01-NOV-1995, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1995, sequence version 1.
DT   03-AUG-2022, entry version 81.
DE   RecName: Full=Glutamine synthetase {ECO:0000303|PubMed:2575672};
DE            Short=GS {ECO:0000303|PubMed:2575672};
DE            EC=6.3.1.2 {ECO:0000250|UniProtKB:P16580};
DE   AltName: Full=Glutamate--ammonia ligase {ECO:0000305};
DE   AltName: Full=Glutamine synthetase II {ECO:0000303|PubMed:2575672};
DE            Short=GSII {ECO:0000303|PubMed:2575672};
GN   Name=glnII {ECO:0000303|PubMed:2575672};
OS   Rhizobium meliloti (Ensifer meliloti) (Sinorhizobium meliloti).
OG   Plasmid pSymB (megaplasmid 2).
OC   Bacteria; Proteobacteria; Alphaproteobacteria; Hyphomicrobiales;
OC   Rhizobiaceae; Sinorhizobium/Ensifer group; Sinorhizobium.
OX   NCBI_TaxID=382;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=2575672; DOI=10.1007/bf02602912;
RA   Shatters R.G., Kahn M.L.;
RT   "Glutamine synthetase II in Rhizobium: reexamination of the proposed
RT   horizontal transfer of DNA from eukaryotes to prokaryotes.";
RL   J. Mol. Evol. 29:422-428(1989).
CC   -!- FUNCTION: Catalyzes the ATP-dependent biosynthesis of glutamine from
CC       glutamate and ammonia. {ECO:0000250|UniProtKB:Q02154}.
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:0000250|UniProtKB:P16580};
CC   -!- COFACTOR:
CC       Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC         Evidence={ECO:0000250|UniProtKB:P16580};
CC   -!- SUBUNIT: Homooctamer and homotetramer. {ECO:0000250|UniProtKB:Q02154}.
CC   -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000250|UniProtKB:P16580}.
CC   -!- SIMILARITY: Belongs to the glutamine synthetase family. {ECO:0000305}.
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DR   EMBL; X17523; CAB37407.1; -; Genomic_DNA.
DR   AlphaFoldDB; P45626; -.
DR   SMR; P45626; -.
DR   GO; GO:0005737; C:cytoplasm; 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.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0006542; P:glutamine biosynthetic process; IEA:InterPro.
DR   GO; GO:0009399; P:nitrogen fixation; IEA:UniProtKB-KW.
DR   Gene3D; 3.10.20.70; -; 1.
DR   InterPro; IPR008147; Gln_synt_b-grasp.
DR   InterPro; IPR036651; Gln_synt_N.
DR   InterPro; IPR014746; Gln_synth/guanido_kin_cat_dom.
DR   InterPro; IPR008146; Gln_synth_cat_dom.
DR   InterPro; IPR027303; Gln_synth_gly_rich_site.
DR   InterPro; IPR027302; Gln_synth_N_conserv_site.
DR   Pfam; PF00120; Gln-synt_C; 1.
DR   Pfam; PF03951; Gln-synt_N; 1.
DR   SMART; SM01230; Gln-synt_C; 1.
DR   SUPFAM; SSF54368; SSF54368; 1.
DR   SUPFAM; SSF55931; SSF55931; 1.
DR   PROSITE; PS00180; GLNA_1; 1.
DR   PROSITE; PS00181; GLNA_ATP; 1.
DR   PROSITE; PS51986; GS_BETA_GRASP; 1.
DR   PROSITE; PS51987; GS_CATALYTIC; 1.
PE   3: Inferred from homology;
KW   ATP-binding; Cytoplasm; Ligase; Magnesium; Metal-binding;
KW   Nitrogen fixation; Nucleotide-binding; Plasmid.
FT   CHAIN           1..329
FT                   /note="Glutamine synthetase"
FT                   /id="PRO_0000153226"
FT   DOMAIN          4..86
FT                   /note="GS beta-grasp"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01330"
FT   DOMAIN          89..329
FT                   /note="GS catalytic"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01331"
FT   BINDING         109
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000250|UniProtKB:P12425"
FT   BINDING         111
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000250|UniProtKB:P12425"
FT   BINDING         167
FT                   /ligand="ATP"
FT                   /ligand_id="ChEBI:CHEBI:30616"
FT                   /evidence="ECO:0000250|UniProtKB:P9WN39"
FT   BINDING         172
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000250|UniProtKB:P12425"
FT   BINDING         179
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000250|UniProtKB:P12425"
FT   BINDING         278
FT                   /ligand="L-glutamate"
FT                   /ligand_id="ChEBI:CHEBI:29985"
FT                   /evidence="ECO:0000250|UniProtKB:P0A1P6"
SQ   SEQUENCE   329 AA;  36966 MW;  AF74BB020F7D637D CRC64;
     MTKYKLEYIW LDATRPYQTL RGKTQIKEFD AFPTLEQLPL WGFDGSSTLQ AEGRTSDCVL
     KPVTVYPDPV RTNGALVMCE VMMPDAETPH ASNTRATVLD DEGAWFGFEQ EYFFYKNGRP
     LGFPEQGYPA PQGPYYTGVG YKNVGDVARQ IVEEHLDICL AAGINHEGIN AEVAKGQWEF
     QIFGKGSKKA ADEVCVARYL LVRLTEKYGI DVEFHCKPLG DTDWNGSGMH ANFSTAYLRE
     VGGQDYFEAL MAAFEKNLHD HINVYGPDNH LRLTGKHETA PWDKFSYGVA DRGASIRVPH
     SFVNNAYPGY LEDRRANSQG DPYQMLLSS