Postsynaptic Density Protein 95 (PSD-95, PSD95, Discs Large Homolog 4, DLG4, Post-synaptic Density Protein 95, Synapse-associated Protein 90, SAP90, SAP-90)

Postsynaptic Density protein 95 (PSD95), also known as Synapse associated protein 90kDa, is a member of the membrane-associated guanylate kinase (MAGUK) family of proteins. PSD95 is a scaffolding protein and is involved in the assembly and function of the postsynaptic density complex (1). These family members consist of an Nterminal variable segment followed by three aminoterminal PDZ domains, an upstream SH3 domain and an inactive carboxyl-terminal guanylate kinase (GK) domain. The first and second PDZ domain localize NMDA receptors and K+ channels to synapses, and the third binds to neuroligins which are neuronal cell adhesion molecules that interact with b-neurexins and form intercellular junctions. PSD-95 also binds to neuronal nitric oxide synthase, possibly through interactions between PDZ domains present on both proteins (2). Thus different PDZ domains of PSD-95 might be specialized for distinct functions (3, 4). PSD95 participates in synaptic targeting of AMPA receptors through an indirect manner involving Stargazin and related transmembrane AMPA receptor regulatory proteins (TARPs) (5). The protein is implicated in experience dependent plasticity and plays an indispensable role in learning (6). Mutations in PSD95 are associated with autism (7).\n\nApplications:\nSuitable for use in Western Blot, Immunofluorescence and Immunohistochemistry. Other applications not tested. \n\nRecommended Dilution:\nWestern Blot: 1ug/ml was sufficient for detection of PSD-95 in 20ug of rat brain tissue extract by ECL, using an IgG (HRP) Goat anti-mouse.\nOptimal dilutions to be determined by the researcher. \n\nStorage and Stability:\nMay be stored at 4 degrees C for short-term only. Aliquot to avoid repeated freezing and thawing. Store at -20 degrees C. Aliquots are stable for 12 months. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap.

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SPECIFICATIONS

Catalog Number

P4700-02A

Size

25ug

Applications

IF, IHC, WB

Hosts

Mouse

Reactivities

Hum, Mouse, Rat, Bov

Form

Supplied as a liquid in PBS, pH 7.4, 0.09% azide, 50% glycerol.

P Type

Mab

Purity

Purified by Protein G affinity chromatography.

Isotype

IgG2a

References

1. Chetkovich D.M., Bunn R.C., Kuo S.H., Kawasaki Y., Kohwi M., and Bredt D.S. (2002) J Neurosci. 22(15): 6415-25. 2. Cao J., Viholainen J.I., Dart C., Warwick H.K., Levland M.L. and Courtney M.J. (2005) J Cell Biol. 168(1): 117-26. 3. Kennedy M. (1997) Trends in Neurosci. 6: 264-268. 4. Irie M. et al. (1997) Science 277(5331): 1511-5. 5. Cai C. et al. (2006) J Biol Chem. 281: 4267-73. 6. Yao W.D. et al. (2004) Neuron 41: 625-38. 7. Cline H. (2005) Curr Biol. 15: R203-5.

Additional Info

Recognizes an ~100kD protein corresponding to the apparent molecular mass of PSD-95 on SDS-PAGE immunoblots. Additional crossreactive bands are detected at ~80kD and 50kD in rat and mouse samples. Species Crossreactivity: human, mouse, rat, bovine.