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dc.contributor.authorBazzi, M D
dc.contributor.authorNelsestuen, G L
dc.date.accessioned2013-03-04T16:13:34Z
dc.date.available2013-03-04T16:13:34Z
dc.date.issued1990-08-21
dc.identifier.citationProtein kinase C interaction with calcium: a phospholipid-dependent process. 1990, 29 (33):7624-30 Biochemistryen_GB
dc.identifier.issn0006-2960
dc.identifier.pmid2271522
dc.identifier.urihttp://hdl.handle.net/10147/270955
dc.description.abstractThe calcium-binding properties of calcium- and phospholipid-dependent protein kinase C (PKC) were investigated by equilibrium dialysis in the presence and the absence of phospholipids. Calcium binding to PKC displayed striking and unexpected behavior; the free proteins bound virtually no calcium at intracellular calcium concentrations and bound limited calcium (about 1 mol/mol of PKC) at 200 microM calcium. However, in the presence of membranes containing acidic phospholipids, PKC bound at least eight calcium ions per protein. The presence of 1 microM phorbol dibutyrate (PDBu) in the dialysis buffer had little effect on these calcium-binding properties. Analysis of PKC-calcium binding by gel filtration under equilibrium conditions gave similar results; only membrane-associated PKC bound significant amounts of calcium. Consequently, PKC is a member of what may be a large group of proteins that bind calcium in a phospholipid-dependent manner. The calcium concentrations needed to induce PKC-membrane binding were similar to those needed for calcium binding (about 40 microM calcium at the midpoint). However, the calcium concentration required for PKC-membrane binding was strongly influenced by the phosphatidylserine composition of the membranes. Membranes with higher percentages of phosphatidylserine required lower concentrations of calcium. These properties suggested that the calcium sites may be generated at the interface between PKC and the membrane. Calcium may function as a bridge between PKC and phospholipids. These studies also suggested that calcium-dependent PKC-membrane binding and PKC function could be regulated by a number of factors in addition to calcium levels and diacylglycerol content of the membrane.
dc.language.isoenen
dc.relation.urlhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC3029954/en_GB
dc.rightsArchived with thanks to Biochemistryen_GB
dc.subject.meshCalcium
dc.subject.meshCell Membrane
dc.subject.meshDialysis
dc.subject.meshPhorbol Esters
dc.subject.meshPhospholipids
dc.subject.meshProtein Kinase C
dc.titleProtein kinase C interaction with calcium: a phospholipid-dependent process.en_GB
dc.typeStudyen
dc.contributor.departmentDepartment of Biochemistry, University of Minnesota, St. Paul 55108.en_GB
dc.identifier.journalBiochemistryen_GB
dc.description.provinceMunsteren
html.description.abstractThe calcium-binding properties of calcium- and phospholipid-dependent protein kinase C (PKC) were investigated by equilibrium dialysis in the presence and the absence of phospholipids. Calcium binding to PKC displayed striking and unexpected behavior; the free proteins bound virtually no calcium at intracellular calcium concentrations and bound limited calcium (about 1 mol/mol of PKC) at 200 microM calcium. However, in the presence of membranes containing acidic phospholipids, PKC bound at least eight calcium ions per protein. The presence of 1 microM phorbol dibutyrate (PDBu) in the dialysis buffer had little effect on these calcium-binding properties. Analysis of PKC-calcium binding by gel filtration under equilibrium conditions gave similar results; only membrane-associated PKC bound significant amounts of calcium. Consequently, PKC is a member of what may be a large group of proteins that bind calcium in a phospholipid-dependent manner. The calcium concentrations needed to induce PKC-membrane binding were similar to those needed for calcium binding (about 40 microM calcium at the midpoint). However, the calcium concentration required for PKC-membrane binding was strongly influenced by the phosphatidylserine composition of the membranes. Membranes with higher percentages of phosphatidylserine required lower concentrations of calcium. These properties suggested that the calcium sites may be generated at the interface between PKC and the membrane. Calcium may function as a bridge between PKC and phospholipids. These studies also suggested that calcium-dependent PKC-membrane binding and PKC function could be regulated by a number of factors in addition to calcium levels and diacylglycerol content of the membrane.


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