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Identification and validation of novel spinophilin-associated proteins in rodent striatum using an enhanced ex vivo shotgun proteomics approach.

Spinophilin regulates excitatory postsynaptic function and morphology during development by virtue of its interactions with filamentous actin, protein phosphatase 1, and a plethora of additional signaling proteins. To provide insight into the roles of spinophilin in mature brain, we characterized the spinophilin interactome in subcellular fractions solubilized from adult rodent striatum by using a shotgun proteomics approach to identify proteins in spinophilin immune complexes. Initial analyses of samples generated using a mouse spinophilin antibody detected 23 proteins that were not present in an IgG control sample; however, 12 of these proteins were detected in complexes isolated from spinophilin knock-out tissue. A second screen using two different spinophilin antibodies and either knock-out or IgG controls identified a total of 125 proteins. The probability of each protein being specifically associated with spinophilin in each sample was calculated, and proteins were ranked according to a chi(2) analysis of the probabilities from analyses of multiple samples. Spinophilin and the known associated proteins neurabin and multiple isoforms of protein phosphatase 1 were specifically detected. Multiple, novel, spinophilin-associated proteins (myosin Va, calcium/calmodulin-dependent protein kinase II, neurofilament light polypeptide, postsynaptic density 95, alpha-actinin, and densin) were then shown to interact with GST fusion proteins containing fragments of spinophilin. Additional biochemical and transfected cell imaging studies showed that alpha-actinin and densin directly interact with residues 151-300 and 446-817, respectively, of spinophilin. Taken together, we have developed a multi-antibody, shotgun proteomics approach to characterize protein interactomes in native tissues, delineating the importance of knock-out tissue controls and providing novel insights into the nature and function of the spinophilin interactome in mature striatum.

Pubmed ID: 20124353 RIS Download

Mesh terms: Actinin | Aging | Amino Acid Sequence | Animals | Cell Line | Gene Knockout Techniques | Humans | Immunoprecipitation | Mass Spectrometry | Mice | Microfilament Proteins | Molecular Sequence Data | Multiprotein Complexes | Neostriatum | Nerve Tissue Proteins | Protein Binding | Protein Transport | Proteomics | Rats | Reproducibility of Results | Solubility | Subcellular Fractions

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Associated grants

  • Agency: NIMH NIH HHS, Id: R01-MH63232
  • Agency: NINDS NIH HHS, Id: P01 NS044282
  • Agency: NIDDK NIH HHS, Id: P60 DK020593
  • Agency: NCI NIH HHS, Id: P30CA68485
  • Agency: NCI NIH HHS, Id: R01 CA126218
  • Agency: NIDDK NIH HHS, Id: DK58404
  • Agency: NIDDK NIH HHS, Id: P30 DK058404
  • Agency: NIMH NIH HHS, Id: T32 MH065215
  • Agency: NICHD NIH HHS, Id: P30 HD015052
  • Agency: NEI NIH HHS, Id: EY08126
  • Agency: NEI NIH HHS, Id: P30 EY008126
  • Agency: NINDS NIH HHS, Id: P01-NS044282
  • Agency: NIMH NIH HHS, Id: T32-MH65215
  • Agency: NIDDK NIH HHS, Id: DK59637
  • Agency: NIDDK NIH HHS, Id: P30 DK020593
  • Agency: NIMH NIH HHS, Id: R01 MH063232
  • Agency: NCI NIH HHS, Id: P30 CA068485
  • Agency: NINDS NIH HHS, Id: NS061537
  • Agency: NCI NIH HHS, Id: CA68485
  • Agency: NICHD NIH HHS, Id: HD15052
  • Agency: NCI NIH HHS, Id: 1R01CA126218
  • Agency: NIDDK NIH HHS, Id: DK20593
  • Agency: NINDS NIH HHS, Id: F31 NS061537
  • Agency: NIDDK NIH HHS, Id: U24 DK059637

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