Molecular characterization of protein kinase C-? binding to lamin A
| Autor: | Roberta Bortul, Lucia Manzoli, Renato Bareggi, Alessandra Cappellini, Giovanna Tabellini, Alberto M. Martelli, Lucio Cocco, Irene Faenza |
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| Rok vydání: | 2002 |
| Předmět: |
Protein Kinase C-alpha
Recombinant Fusion Proteins Molecular Sequence Data Peptide Biology overlay assays Binding Competitive Biochemistry Substrate Specificity Animals Humans Amino Acid Sequence Binding site PKC regulation Molecular Biology Protein Kinase C Protein kinase C PKC-binding proteins overlay assays nucleus fusion proteins PKC regulation chemistry.chemical_classification Binding Sites nucleus Cell Biology Lamin Type A Fusion protein Peptide Fragments Protein Structure Tertiary Rats PKC-binding proteins Amino acid Isoenzymes chemistry Signal transduction fusion proteins Lamin Protein Binding Binding domain |
| Zdroj: | Journal of Cellular Biochemistry. 86:320-330 |
| ISSN: | 1097-4644 0730-2312 |
| Popis: | Previous results from our laboratory have identified lamin A as a protein kinase C (PKC)-binding protein. Here, we have identified the regions of PKC-α that are crucial for this binding. By means of overlay assays and fusion proteins made of glutathione-S-transferase (GST) fused to elements of rat PKC-α, we have established that binding occurs through both the V5 region and a portion of the C2 region (i.e., the calcium-dependent lipid binding (CaLB) domain) of the kinase. In particular, we have found that amino acid 200–217 of the CaLB domain are essential for binding lamin A, as a synthetic peptide corresponding to this stretch of amino acids prevented the interaction between the CaLB domain and lamin A. We also show that the presence of four lysine residues of the CaLB domain (K205, K209, K211, and K213) was essential for the binding. We have determined that binding of elements of PKC-α to lamin A does not require the presence of cofactors such as phosphatidylserine (PS) and Ca2+. We have also found that the binding site of lamin A for the CaLB domain of PKC-α is localized in the carboxyl-terminus of the lamin, downstream of amino acid 499. Our findings may prove to be important to clarify the mechanisms regulating PKC function within the nucleus and may also lead to the synthesis of isozyme-specific drugs to attenuate or reverse PKC-dependent nuclear signaling pathways important for the pathogenesis of cancer. © 2002 Wiley-Liss, Inc. |
| Databáze: | OpenAIRE |
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