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Symbol GPHN contributors: mct/npt/pgu - updated : 09-11-2016
HGNC name gephyrin
HGNC id 15465
  • a N terminal homologous to the bacterial protein MogA, with conserved N-terminal G- and C-terminal E-domain, connected by the central (C-) domain (
  • a small 15-AAs tubulin-binding domain necessary and sufficient for fusion with MLL in leukemia
  • C terminal domain homolog to the bacterial MoeA believed to activate molybedenum before its incorporation into molybdopterin
    interspecies homolog to Drosophila Cinnamon
  • in the N-terminal section : moaB/mog family
  • in the C-terminal section : moeA family
  • CATEGORY enzyme , structural protein , receptor
    SUBCELLULAR LOCALIZATION     plasma membrane
  • mainly expressed in the membrane and cytoplasm of neurons in temporal lobe epileptic foci
  • its presence in a cytosolic 600 kDa protein complex suggests that its metabolic and/or other non-neuronal functions are exerted in the cytoplasm and are not confined to a particular subcellular compartment
  • basic FUNCTION
  • neurotransmitter receptor clustering and anchoring protein to subsynaptic microtubules of inhibitory ion channel receptors
  • third step of molybenum cofactor biosynthesis in non neuronal tissues (insertion of molybdenum into molybdobiopterin)
  • microtubule-associated protein involved in membrane protein-cytoskeleton interactions
  • responsible for molybdenum cofactor synthesis and the clustering of glycine and GABA(A) receptors at inhibitory synapses
  • postsynaptic scaffolding protein participated in clustering GABA(A) receptors at inhibitory synapses
  • major protein determinant for the clustering of inhibitory neurotransmitter receptors
  • major postsynaptic scaffolding protein at inhibitory synapses
  • multimeric scaffolding protein gephyrin forms post-synaptic clusters at inhibitory sites, thereby anchoring inhibitory glycine (GLYR) and subsets of &
  • 947;-aminobutyric acid type A (GABAA) receptors
  • is a scaffold protein essential for the postsynaptic clustering of inhibitory glycine and different subtypes of GABA(A) receptors
  • postsynaptic scaffolding protein, essential for the clustering of glycine and gamma-aminobutyric acid type-A receptors (GABAARs) at inhibitory synapse
  • vital for the organization of proteins at inhibitory receptors, molybdenum cofactor biosynthesis and other diverse functions
  • is a central player at inhibitory postsynapses, directly binds and organizes GABAA and glycine receptors (GABAARs and GlyRs), and is thereby indispensable for normal inhibitory neurotransmission
    PHYSIOLOGICAL PROCESS nervous system
    signaling neurotransmission
    a component
  • component of the glycine receptor
  • collybistin-gephyrin (ARHGEF9/GPHN)complex has an intimate role in the clustering of GABA(A)Rs containing the alpha2 subunit
    small molecule
  • glycine receptor beta subunit, GABAA receptors tubulin
  • interacts with GABARAP
  • formation of gephyrin scaffolds at inhibitory synapses requires an intact ARHGEF9 PH-domain but is CDC42-independent
  • VPS35 binding to gephyrin
  • interacting with GABRA1, GABRA3
  • GPHN-binding protein AHRGEF9 is involved in regulating the phosphorylation of GPHN
  • ARHGEF9 and CDK5 are involved in regulating the phosphorylation of GPHN at postsynaptic membrane specializations
  • CDK5 plays likely an essential role for the stability of GPHN-dependent GABAA receptor clusters in hippocampal neurons
  • NLGN2 is localized selectively at GABAergic synapses, where it interacts with the scaffolding protein GPHN in the post-synaptic density
  • PIN1-dependent signalling represents a mechanism to modulate GABAergic transmission by regulating NLGN2/GPHN interaction
  • intimate association of GABRA5 with GPHN, resulting in constant synaptic levels of GABRA5 throughout circuit formation that regulates neuronal development
  • GSK3B regulates the sorting of GPHN and NLGN2 complexes in a KIF5A-dependent manner
  • PKC-dependent phosphorylation of GAP43 plays a critical role in regulating postsynaptic GPHN aggregation in developing GABAergic synapses
  • neuron-specific ARHGEF9 interacts with EIF3A, and its binding partner GPHN associates with MTOR
  • EPHA7 regulates GPHN clustering and the maintenance of inhibitory synaptic connectivity via MTOR signalling
  • cell & other
    corresponding disease(s) MOCODC , STHE2 , EEOC2
    Other morbid association(s)
    TypeGene ModificationChromosome rearrangementProtein expressionProtein Function
    tumoral fusion      
    with MLL in t(11;14) (q23;q24) in acute monoblastic leukemia
    constitutional     --low  
    significantly lower in the temporal neocortex of temporal lobe epilepsy patients compared to the controls
    constitutional     --low  
    in Alzheimer Disease
    Variant & Polymorphism
    Candidate gene
    Therapy target
  • Gephyrin-deficient (geph(-/-)) mice die after birth due to disinhibition of motor and sensory pathways resulting from a lack of postsynaptic glycine receptor and GABA(A) receptor clusters