Abstract:
:The astrocyte-specific enzyme glutamine synthetase (GS), which catalyzes the amidation of glutamate to glutamine, plays an essential role in supporting neurotransmission and in limiting NH4+ toxicity. Accordingly, deficits in GS activity contribute to epilepsy and neurodegeneration. Despite its central role in brain physiology, the mechanisms that regulate GS activity are poorly defined. Here, we demonstrate that GS is directly phosphorylated on threonine residue 301 (T301) within the enzyme's active site by cAMP-dependent protein kinase (PKA). Phosphorylation of T301 leads to a dramatic decrease in glutamine synthesis. Enhanced T301 phosphorylation was evident in a mouse model of epilepsy, which may contribute to the decreased GS activity seen during this trauma. Thus, our results highlight a novel molecular mechanism that determines GS activity under both normal and pathological conditions.
journal_name
Front Mol Neuroscijournal_title
Frontiers in molecular neuroscienceauthors
Huyghe D,Denninger AR,Voss CM,Frank P,Gao N,Brandon N,Waagepetersen HS,Ferguson AD,Pangalos M,Doig P,Moss SJdoi
10.3389/fnmol.2019.00120subject
Has Abstractpub_date
2019-05-21 00:00:00pages
120issn
1662-5099journal_volume
12pub_type
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