Article ; Online: The myristoylated amino-terminus of an Arabidopsis calcium-dependent protein kinase mediates plasma membrane localization.
2013 Volume 82, Issue 3, Page(s) 267–278
Abstract: Calcium-dependent protein kinases (CDPK) are a major group of calcium-stimulated kinases found in plants and some protists. Many CDPKs are membrane-associated, presumably because of lipid modifications at their amino termini. We investigated the ... ...
Abstract | Calcium-dependent protein kinases (CDPK) are a major group of calcium-stimulated kinases found in plants and some protists. Many CDPKs are membrane-associated, presumably because of lipid modifications at their amino termini. We investigated the subcellular location and myristoylation of AtCPK5, a member of the Arabidopsis CDPK family. Most AtCPK5 was associated with the plasma membrane as demonstrated by two-phase fractionation of plant microsomes and by in vivo detection of AtCPK5-GFP fusion proteins. AtCPK5 was a substrate for plant N-myristoyltransferase and myristoylation was prevented by converting the glycine at the proposed site of myristate attachment to alanine (G2A). In transgenic plants, a G2A mutation completely abolished AtCPK5 membrane association, indicating that myristoylation was essential for membrane binding. The first sixteen amino acids of AtCPK5 were sufficient to direct plasma membrane localization. In addition, differentially phosphorylated forms of AtCPK5 were detected both in planta and after expression of AtCPK5 in a cell-free plant extract. Our results demonstrate that AtCPK5 is myristoylated at its amino terminus and that myristoylation is required for membrane binding. |
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MeSH term(s) | Acyltransferases/metabolism ; Arabidopsis/enzymology ; Arabidopsis/genetics ; Arabidopsis/metabolism ; Arabidopsis Proteins/genetics ; Arabidopsis Proteins/metabolism ; Binding Sites/genetics ; Calcium/metabolism ; Calcium-Calmodulin-Dependent Protein Kinases/genetics ; Calcium-Calmodulin-Dependent Protein Kinases/metabolism ; Cell Membrane/enzymology ; Cell Membrane/metabolism ; Green Fluorescent Proteins/genetics ; Green Fluorescent Proteins/metabolism ; Immunoblotting ; Microscopy, Confocal ; Mutation ; Myristic Acid/metabolism ; Phosphorylation ; Plants, Genetically Modified ; Protein Kinases/genetics ; Protein Kinases/metabolism ; Protein Transport |
Chemical Substances | Arabidopsis Proteins ; Myristic Acid (0I3V7S25AW) ; Green Fluorescent Proteins (147336-22-9) ; Acyltransferases (EC 2.3.-) ; glycylpeptide N-tetradecanoyltransferase (EC 2.3.1.97) ; Protein Kinases (EC 2.7.-) ; CPK5 protein, Arabidopsis (EC 2.7.11.17) ; Calcium-Calmodulin-Dependent Protein Kinases (EC 2.7.11.17) ; Calcium (SY7Q814VUP) |
Language | English |
Publishing date | 2013-04-23 |
Publishing country | Netherlands |
Document type | Journal Article ; Research Support, Non-U.S. Gov't |
ZDB-ID | 778032-1 |
ISSN | 1573-5028 ; 0167-4412 |
ISSN (online) | 1573-5028 |
ISSN | 0167-4412 |
DOI | 10.1007/s11103-013-0061-0 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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