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Oncoprotein protein kinase

a technology of oncoprotein and kinase, which is applied in the direction of transferases, peptide/protein ingredients, instruments, etc., can solve the problems of overexpression of a particular gene, affecting healthy cells as well as neoplastic cells, and prone to act indiscriminately,

Inactive Publication Date: 2006-06-08
RGT UNIV OF CALIFORNIA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a new protein kinase called JNK1 that phosphorylates the c-Jun N-terminal activation domain. JNK1 is a 46 kD serine and threonine kinase that specifically phosphorylates serine residues 63 and 73 of c-Jun. The discovery of JNK1 allows for the identification of compositions that affect JNK activity and the subsequent activation of genes associated with AP-1 sites. The invention also provides a method of treating a cell proliferative disorder associated with JNK by administering a therapeutically effective amount of a reagent that modulates JNK activity. The invention also provides a synthetic peptide that can inhibit the activation of c-Jun by JNK. Additionally, the invention describes a new protein kinase called JNK2 with similar activity to JNK1.

Problems solved by technology

In cells that have lost their growth regulatory mechanisms, it is believed that this Fos / Jun complex may “sit” on the AP-1 site, causing overexpression of a particular gene.
One problem with existing drug therapy is that it tends to act indiscriminately and affects healthy cells as well as neoplastic cells.
This is a major problem with many forms of chemotherapy where there are severe side effects primarily due to the action of toxic drugs on healthy cells.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Plasmids and Expression of GST Fusion Proteins

[0097] The glutathione-S-transferase (GST)-cJun expression vector, pGEX2T-cJun(wt), was constructed by inserting a filled-in BspHI-PstI fragment (encoding AA 1-223) from RSV-cJun(BspHI) into the SmaI site of pGEX2T (Pharmacia). RSV-cJun(BspHI) was constructed by changing the translation initiation sequence CTATGA of RSV-cJun to TCATGA by site-directed mutagenesis. The GSTcJun(Ala63 / 67)(BspHI) expression vector was derived in the same manner from RSV-cJun(Ala63 / 73) (Smeal, et al., supra, 1991) and was used to construct pGEX2T-cJun(Ala 63 / 67). The various GSTcJun truncation mutants were constructed using the polymerase chain reaction (PCR) to amplify various portions of c-Jun coding region. The sequences of the primers are indicated below:

N-terminal primers:(SEQ ID NO: 2)TCTGCAGGATCCCCATGACTGCAAAGATGGAAACG (underlinedcodon: amino acid 1);(SEQ ID NO: 3)TCTGCAGGATCCCCGACGATGCCCTCAACGCCTC (a.a.11);(SEQ ID NO: 4)TCTGCAGGATCCCCGAGAGCGGACCTTA...

example 2

Kinase Assays

Solid Phase Kinase Assay

[0104] Cell extracts were diluted so that the final composition of the WCE buffer was 20 mM HEPES pH 7.7, 75 mM NaCl, 2.5 mM MgCl2, 0.1 mM EDTA, 0.05% Triton X-100, 0.5 mM DTT, 20 mM β-glycerolphosphate, 0.1 mM Na3VO4, 2 μg / ml leupeptin, 100 μg / ml PMSF. The extracts were mixed with 10 μl of GSH-agarose suspension (Sigma) to which 10 μg of either GST or GST-Jun fusion proteins were bound. The mixture was rotated at 4° C. for 3 hours in a microfuge tube and pelleted by centrifugation at 10,000×g for 20 sec. After 4×1 ml washes in HEPES binding buffer (20 mM HEPES pH 7.7, 50 mM NaCl. 2.5 mM MgCl2, 0.1 mM EDTA, 0.05% Triton X-100), the pelleted beads were resuspended in 30 μl of kinase buffer (20 mM HEPES pH 7.6, 20 mM MgCl2, 20 mM β-glycerolphosphate, 20 μM p-nitrophenyl phosphate, 0.1 mM Na3VO4, 2 mM DTT) containing 20 μM ATP and 5 μCl γ-32P-ATP. After 20 minutes at 30° C. the reaction was terminated by washing with HEPES binding buffer. Phospho...

example 3

Binding of a Protein Kinase to GST-cJun-GSH-Agarose Beads

[0106] The fusion protein, GSTcJun(wt), can bind through its GST moiety to glutathione (GSH)-agarose beads to generate an affinity matrix for identification of c-Jun binding proteins, which may include protein kinases. Ha-ras transformation of FR3T3 cells results in increased phosphorylation of c-Jun on Ser 63 and 73 (Binetruy, et al., supra, 1991; Smeal. et al., supra, 1991). Preliminary experiments indicated that transformed cells contained higher levels of c-Jun N-terminal kinase activity, while the levels of c-Jun C-terminal kinase activity remaned unchanged. To develop a more convenient assay for characterizing the c-Jun N-terminal kinase activity, nuclear and cytoplasmic extracts of untransformed and transformed FR3T3 cells were mixed with GSTcJun(wt)-GSH-agarose beads. FRT3T3(−) and Ha-ras-transformed FR3T3(+) cells were kept in 0.5% FCS for 24 hours and harvested to prepare nuclear and cytosolic extracts. These extrac...

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Abstract

An isolated polypeptide (JNK) characterized by having a molecular weight of 46 kD as determined by reducing SDS-PAGE, having serine and threonine kinase activity, phosphorylating the c-Jun N-terminal activation domain and polynucleotide sequences and method of detection of JNK are provided herein. JNK phosphorylates c-Jun N-terminal activation domain which affects gene expression from AP-1 sites.

Description

[0001] This application is a divisional of U.S. patent application Ser. No. 08 / 799,913, filed Feb. 13, 1997, now U.S. Pat. No. 5,804,399, which is a continuation of Ser. No. 08 / 444,393, filed May 19, 1995, now U.S. Pat. No. 5,605,808, which is a divisional of U.S. patent application Ser. No. 08 / 276,860, filed Jul. 18, 1994, now U.S. Pat. No. 5,593,884, which is a continuation-in-part application of U.S. patent application Ser. No. 08 / 220,602, filed Mar. 25, 1994, which is a continuation-in-part of U.S. patent application Ser. No. 08 / 094,533, filed Jul. 19, 1993.[0002] This invention was made with support by Howard Hughes Medical Institute and Government support under Grant No. DE-86ER60429, awarded by the Department of Energy and Grant No. CA-50528 and CA-58396, awarded by the National Institute of Health. The Government has certain rights in this invention. Also supported by the Howard Hughes Medical Institute.BACKGROUND OF THE INVENTION [0003] 1. Field of the Invention [0004] This...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12Q1/68C12Q1/48A61K38/00C07K16/40C12N9/12C12N15/54
CPCA61K38/00C07K16/40C12N9/12C12N9/1205C12Q1/485C12Q1/6897G01N2333/9121G01N2500/04Y10S435/81Y10S435/975
Inventor KARIN, MICHAELHIBI, MASAHIKOLIN, ANNING
Owner RGT UNIV OF CALIFORNIA
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