RGD Reference Report - Neurogranin binds to phosphatidic acid and associates to cellular membranes. - Rat Genome Database

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Neurogranin binds to phosphatidic acid and associates to cellular membranes.

Authors: Dominguez-Gonzalez, I  Vazquez-Cuesta, SN  Algaba, A  Diez-Guerra, FJ 
Citation: Dominguez-Gonzalez I, etal., Biochem J. 2007 May 15;404(1):31-43.
RGD ID: 9835427
Pubmed: PMID:17295609   (View Abstract at PubMed)
PMCID: PMC1868841   (View Article at PubMed Central)
DOI: DOI:10.1042/BJ20061483   (Journal Full-text)

Neurogranin (Ng) is a 78-amino-acid-long protein concentrated at dendritic spines of forebrain neurons that is involved in synaptic plasticity through the regulation of CaM (calmodulin)-mediated signalling. Ng features a central IQ motif that mediates binding to CaM and is phosphorylated by PKC (protein kinase C). We have analysed the subcellular distribution of Ng and found that it associates to cellular membranes in rat brain. In vitro binding assays revealed that Ng selectively binds to PA (phosphatidic acid) and that this interaction is prevented by CaM and PKC phosphorylation. Using the peptide Ng-(29-47) and a mutant with an internal deletion (Ng-IQless), we have shown that Ng binding to PA and to cellular membranes is mediated by its IQ motif. Ng expressed in NIH-3T3 cells accumulates at peripheral regions of the plasma membrane and localizes at intracellular vesicles that can be clearly visualized following saponin permeabilization. This distribution was affected by PLD (phospholipase D) and PIP5K (phosphatidylinositol 4-phosphate 5-kinase) overexpression. Based on these results, we propose that Ng binding to PA may be involved in Ng accumulation at dendritic spines and that Ng could modulate PA signalling in the postsynaptic environment.

Gene Ontology Annotations    Click to see Annotation Detail View

Molecular Function
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
lysophosphatidic acid binding  IDA 9835427 RGD 
phosphatidic acid binding  IDA 9835427 RGD 
phosphatidylinositol phosphate binding  IDA 9835427 RGD 

Objects Annotated

Genes (Rattus norvegicus)
Gap43  (growth associated protein 43)
Nrgn  (neurogranin)


Additional Information