Cell Signaling Technology

Product Pathways - Ca / cAMP / Lipid Signaling

Phospho-PKCdelta (Thr505) Antibody #9374

Applications Reactivity MW (kDa) Source
W H M R Mk Hm 78 Rabbit

Applications Key:  W=Western Blotting
Reactivity Key:  H=Human  M=Mouse  R=Rat  Mk=Monkey  Hm=Hamster
Species enclosed in parentheses are predicted to react based on 100% sequence homology. Species cross-reactivity is determined by Western blot.

Specificity / Sensitivity

Phospho-PKCδ (Thr505) Antibody detects endogenous levels of PKCδ only when phosphorylated at Thr505. This antibody does not cross-react with the phosphorylated forms of PKC isoforms α, β, γ, ζ or ε.

Source / Purification

Polyclonal antibodies are produced by immunizing rabbits with a synthetic phospho-peptide (KLH-coupled) corresponding to residues around Thr505 of mouse PKCδ. Antibodies are purified by protein A and peptide affinity chromatography.

Western Blotting

Western Blotting

Western blot analysis of extracts from U-937 cells, untreated or TPA treated (0.2 µM), using Phospho-PKCδ (Thr505) Antibody.

Western Blotting

Western Blotting

Western blot analysis of extracts from Baculovirus-infected cells expressing PKC isoforms α, β, γ, δ or ε, using Phospho-PKCδ (Thr505) Antibody (upper) or control PKCα, β, γ, δ, ε antibodies (lower).

Background

Activation of protein kinase C (PKC) is one of the earliest events in a cascade that controls a variety of cellular responses, including secretion, gene expression, proliferation and muscle contraction (1,2). PKC isoforms belong to three groups based on calcium dependency and activators. Classical PKCs are calcium-dependent via their C2 domains and are activated by phosphatidylserine (PS), diacylglycerol (DAG) and phorbol esters (TPA, PMA) through their cysteine-rich C1 domains. Both novel and atypical PKCs are calcium-independent, but only novel PKCs are activated by PS, DAG and phorbol esters (3-5). Members of these three PKC groups contain a pseudo-substrate or autoinhibitory domain that binds to substrate-binding site in the catalytic domain to prevent activation in the absence of cofactors or activators.Control of PKC activity is regulated through three distinct phosphorylation events. Phosphorylation of Thr500 in the activation loop, the autophosphorylation site at Thr641 and at carboxy-terminal hydrophobic site Ser660 occurs in vivo (2). Atypical PKC isoforms lack hydrophobic region phosphorylation, which correlates with the presence of glutamic acid rather than the serine or threonine residues found in more typical PKC isoforms. Either the enzyme PDK1 or a close relative is responsible for PKC activation.A recent addition to the PKC superfamily is PKCμ (PKD), which is regulated by DAG and TPA through its C1 domain. PKD is distinguished by the presence of a PH domain and by its unique substrate recognition and Golgi localization (6). PKC-related kinases (PRK) lack the C1 domain and do not respond to DAG or phorbol esters. Phosphatidylinositol lipids activate PRKs and small Rho-family GTPases bind to the homology region 1 (HR1) to regulate PRK kinase activity (7).

  1. Nishizuka, Y. (1984) Nature 308, 693-698.
  2. Keranen, L.M. et al. (1995) Curr. Biol. 5, 1394-1403.
  3. Mellor, H. and Parker, P.J. (1998) Biochem J. 332 (Pt 2), 281-292.
  4. Ron, D. and Kazanietz, M.G. (1999) FASEB J. 13, 1658-1676.
  5. Moscat, J. and Diaz-Meco, M.T. (2000) EMBO Rep. 1, 399-403.
  6. Baron, C.L. and Malhotra, V. (2002) Science 295, 325-328.
  7. Flynn, P. et al. (2000) J. Biol. Chem. 275, 11064-11070.

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