Cell Signaling Technology

Product Pathways - Ca / cAMP / Lipid Signaling

PKCι (C83H11) Rabbit mAb #2998

Applications Reactivity Sensitivity MW (kDa) Isotype
W F H M R Mk Endogenous 78 Rabbit IgG

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

Protocols

Specificity / Sensitivity

PKCι (C83H11) Rabbit mAb detects endogenous levels of total PKCι. The antibody does not cross-react with other PKC isoforms.

Source / Purification

Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to human PKCι.

Western Blotting

Western Blotting

Western blot analysis of extracts from C2C12, PC12 and COS cells using PKCι (C83H11) Rabbit mAb.

Flow Cytometry

Flow Cytometry

Flow cytometric analysis of 293 cells using PKCι (C83H11) Rabbit mAb (blue) compared to a nonspecific negative control antibody (red).

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 sites 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 occurs in vivo at Thr500 in the activation loop, at Thr641 through autophosphorylation, and at the carboxy-terminal hydrophobic site Ser660 (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. 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).

PKCι (iota) is an atypical PKC that has recently been identified as an oncogene. The corresponding gene is amplified in many types of cancer and protein expression is essential for transformed cell growth, making this protein an attractive therapeutic target (8).

  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.
  8. Fields, A.P. and Regala, R.P. (2007) Pharmacol. Res. 55, 487-497.

Application References

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For Research Use Only. Not For Use In Diagnostic Procedures.

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