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Abstract:

We isolated a full-length cDNA clone (StCDPK1) encoding a calcium-dependent protein kinase (CDPK) by screening a stolon tip cDNA library from potato plants (Solarium tuberosum L.). The predicted amino acid sequence of the cDNA reveals a high degree of similarity with other members of the CDPK family except in the N-terminal region. As described for other CDPKs, StCDPK1 has a putative N-terminal myristoylation sequence. A coupled transcription/translation system was used to demonstrate that this post-translational modification occurs in vitro. The behaviour of the myristoylated form of StCDPK1 during its purification on a phenyl-Sepharose column mimics that of the endogenous potato enzyme suggesting that this modification occurs in vivo. In addition, a possible palmitoylation site is present in StCDPK1. Southern blot analysis suggests that more than one CDPK isoform is present in potato plants. Northern blot analysis of steady-state mRNA levels for StCDPK1 in different tissues of potato plants shows that the transcript is differentially expressed in tuberizing stolons. The transcript appears in the early steps of tuber formation before the induction of other genes, such as Pin2 and patatin. This result parallels previous data on CDPK activity in potato plants which was highest at the beginning of tuberization. Our results suggest that StCDPK1 is developmentally regulated. The early and transient expression of this CDPK isoform in the tuberization process suggests that this kinase could trigger a cascade of phosphorylation events involved in tuber induction.

Registro:

Documento: Artículo
Título:Molecular characterization of StCDPK1, a calcium-dependent protein kinase from Solanum tuberosum that is induced at the onset of tuber development
Autor:Raiíces, M.; Chico, J.M.; Téllez-Iñón, M.T.; Ulloa, R.M.
Filiación:Instituto de Investigaciones en Ingeniería Genética y Biología Molecular, CONICET, Acultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Vuelta de Obligado 2490, 1428 Buenos Aires, Argentina
Palabras clave:Calcium-dependent protein kinases; Differential expression; N-terminal myristoylation; Solanum tuberosum; StCDPK1; Tuberization; amino terminal sequence; cDNA clone; chemical modification; DNA library; enzyme activity; gene induction; genetic transcription; growth regulation; homology; northern blotting; plant development; potato tuber; protein kinase C; Amino acids; DNA; Enzymes; Phosphorylation; Plant cell culture; Amino Acid Sequence; Blotting, Northern; Blotting, Southern; Calcium-Binding Proteins; Cloning, Molecular; DNA, Complementary; DNA, Plant; Gene Expression Regulation, Developmental; Gene Expression Regulation, Enzymologic; Gene Expression Regulation, Plant; Molecular Sequence Data; Myristic Acid; Plant Proteins; Protein Kinases; RNA, Messenger; RNA, Plant; Sequence Alignment; Sequence Analysis, DNA; Sequence Homology, Amino Acid; Solanum tuberosum; Eukaryota; Solanum tuberosum; Solarium; Tuberosum
Año:2001
Volumen:46
Número:5
Página de inicio:591
Página de fin:601
DOI: http://dx.doi.org/10.1023/A:1010661304980
Título revista:Plant Molecular Biology
Título revista abreviado:Plant. Mol. Biol.
ISSN:01674412
CAS:Calcium-Binding Proteins; DNA, Complementary; DNA, Plant; Myristic Acid, 544-63-8; Plant Proteins; Protein Kinases, EC 2.7.1.37; RNA, Messenger; RNA, Plant; StCDPK1 protein, Solanum tuberosum, EC 2.7.1.-
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01674412_v46_n5_p591_Raiices

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Citas:

---------- APA ----------
Raiíces, M., Chico, J.M., Téllez-Iñón, M.T. & Ulloa, R.M. (2001) . Molecular characterization of StCDPK1, a calcium-dependent protein kinase from Solanum tuberosum that is induced at the onset of tuber development. Plant Molecular Biology, 46(5), 591-601.
http://dx.doi.org/10.1023/A:1010661304980
---------- CHICAGO ----------
Raiíces, M., Chico, J.M., Téllez-Iñón, M.T., Ulloa, R.M. "Molecular characterization of StCDPK1, a calcium-dependent protein kinase from Solanum tuberosum that is induced at the onset of tuber development" . Plant Molecular Biology 46, no. 5 (2001) : 591-601.
http://dx.doi.org/10.1023/A:1010661304980
---------- MLA ----------
Raiíces, M., Chico, J.M., Téllez-Iñón, M.T., Ulloa, R.M. "Molecular characterization of StCDPK1, a calcium-dependent protein kinase from Solanum tuberosum that is induced at the onset of tuber development" . Plant Molecular Biology, vol. 46, no. 5, 2001, pp. 591-601.
http://dx.doi.org/10.1023/A:1010661304980
---------- VANCOUVER ----------
Raiíces, M., Chico, J.M., Téllez-Iñón, M.T., Ulloa, R.M. Molecular characterization of StCDPK1, a calcium-dependent protein kinase from Solanum tuberosum that is induced at the onset of tuber development. Plant. Mol. Biol. 2001;46(5):591-601.
http://dx.doi.org/10.1023/A:1010661304980