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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


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

Catalytic activityi

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

GO - Molecular functioni


Molecular functionLigase
LigandATP-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

Keywords - Cellular componenti

Chloroplast, Plastid

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_0000153194‹1 – ›15Probable glutamine synthetase leaf isozymeAdd BLAST›15


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)DescriptionActionsGraphical viewLength
Non-terminal residuei11
Non-terminal residuei151

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.

Entry informationi

Entry nameiGLNA2_PINPS
AccessioniPrimary (citable) accession number: P81107
Entry historyiIntegrated 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. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programPlant Protein Annotation Program


Keywords - Technical termi

Direct protein sequencing


  1. SIMILARITY comments
    Index of protein domains and families