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Probable glutamine synthetase leaf isozyme

Pinus pinaster (Maritime pine)
Reviewed-Annotation score: Annotation score: 2 out of 5-Experimental evidence at protein leveli


The light-modulated chloroplast enzyme, encoded by a nuclear gene and expressed primarily in leaves, is responsible for the reassimilation of the ammonia generated by photorespiration.By similarity

Catalytic activityi

ATP + L-glutamate + NH3 = ADP + phosphate + L-glutamine.

GO - Molecular functioni

Complete GO annotation...

Keywords - Molecular functioni


Keywords - Ligandi

ATP-binding, Nucleotide-binding

Enzyme and pathway databases

BRENDAi6.3.1.2. 4852.

Names & Taxonomyi

Protein namesi
Recommended name:
Probable glutamine synthetase leaf isozyme (EC:
Alternative name(s):
Glutamate--ammonia ligase
OrganismiPinus pinaster (Maritime pine)
Taxonomic identifieri71647 [NCBI]
Taxonomic lineageiEukaryotaViridiplantaeStreptophytaEmbryophytaTracheophytaSpermatophytaPinidaePinalesPinaceaePinusPinus

Subcellular locationi

GO - Cellular componenti

Complete GO annotation...

Keywords - Cellular componenti

Chloroplast, Plastid

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Chaini‹1 – ›15›15Probable glutamine synthetase leaf isozymePRO_0000153194Add


Subunit structurei

Homooctamer.By similarity

Family & Domainsi

Sequence similaritiesi

Belongs to the glutamine synthetase family.Curated


Sequence statusi: Fragment.

Mass (Da):1,614
Last modified:July 15, 1998 - v1

Experimental Info

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Non-terminal residuei1 – 11
Non-terminal residuei15 – 151


3D structure databases


Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Enzyme and pathway databases

BRENDAi6.3.1.2. 4852.

Family and domain databases



  1. "Genetic analysis of needle proteins in maritime pine. 1. Mapping dominant and codominant protein markers assayed on diploid tissue, in a haploid-based genetic map."
    Plomion C., Costa P., Bahrman N., Frigerio J.-M.
    Silvae Genet. 46:161-165(1997)
    Cited for: PROTEIN SEQUENCE.
    Tissue: Needle.
  2. "Separation and characterization of needle and xylem maritime pine proteins."
    Costa P., Pionneau C., Bauw G., Dubos C., Bahrman N., Kremer A., Frigerio J.-M., Plomion C.
    Electrophoresis 20:1098-1108(1999) [PubMed] [Europe PMC] [Abstract]
    Cited for: PROTEIN SEQUENCE.
    Tissue: Needle.

Entry informationi

Entry nameiGLNA2_PINPS
AccessioniPrimary (citable) accession number: P81107
Entry historyi
Integrated into UniProtKB/Swiss-Prot: July 15, 1998
Last sequence update: July 15, 1998
Last modified: April 1, 2015
This is version 51 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programPlant Protein Annotation Program



On the 2D-gel the determined pI of this protein is: 5.7, its MW is: 42 kDa.

Keywords - Technical termi

Direct protein sequencing


  1. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.