Protein kinase casein kinase 2 holoenzyme produced ectopically in human cells can be exported to the external side of the cellular membrane
Author
dc.contributor.author
Rodríguez, Fernando
Author
dc.contributor.author
Allende, Catherine C.
Author
dc.contributor.author
Allende, Jorge E.
Admission date
dc.date.accessioned
2018-12-20T14:10:48Z
Available date
dc.date.available
2018-12-20T14:10:48Z
Publication date
dc.date.issued
2005
Cita de ítem
dc.identifier.citation
Proceedings of the National Academy of Sciences of the United States of America, Volumen 102, Issue 13, 2018, Pages 4718-4723
Identifier
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00278424
Identifier
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10.1073/pnas.0501074102
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/154435
Abstract
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Ectokinases can phosphorylate extracellular proteins and external domains of membrane proteins influencing cell adhesion, movement, and cellular interactions. An ectokinase with the properties of casein kinase 2 (CK2) has been previously described, but little is known about the structural characteristics that allow this enzyme to be exported from the cell. Transfection of human embryonic kidney-293 cells with cDNAs coding for the catalytic (CK2α or CK2α′) and regulatory (CK2β) subunits with hemaglutinin tags allowed us to study the export of ectopically synthesized enzyme. When the catalytic (CK2α or CK2α′) and the CK2β regulatory subunits are cotransfected, the tetrameric enzyme composed of both subunits (holoenzyme) is detected outside the cell. This observation has been confirmed by assaying protein kinase activity in immunoprecipitates obtained with antihemaglutinin antibody by using a CK2-specific peptide substrate and by Western blots as well as by immunofluorescence of nonpermea