The Cyclin-Dependent Kinase Ortholog pUL97 of Human Cytomegalovirus Interacts with Cyclins
The human cytomegalovirus (HCMV)-encoded protein kinase, pUL97, is considered a cyclin-dependent kinase (CDK) ortholog, due to shared structural and functional characteristics. The primary mechanism of CDK activation is binding to corresponding cyclins, including cyclin T1, which is the usual regula...
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doaj-18bbe25ac1b140d98121592bcf1439be2020-11-24T23:52:42ZengMDPI AGViruses1999-49152013-12-015123213323010.3390/v5123213v5123213The Cyclin-Dependent Kinase Ortholog pUL97 of Human Cytomegalovirus Interacts with CyclinsLaura Graf0Rike Webel1Sabrina Wagner2Stuart T. Hamilton3William D. Rawlinson4Heinrich Sticht5Manfred Marschall6Institute for Clinical and Molecular Virology, University of Erlangen-Nuremberg, 91054 Erlangen, GermanyInstitute for Clinical and Molecular Virology, University of Erlangen-Nuremberg, 91054 Erlangen, GermanyInstitute for Clinical and Molecular Virology, University of Erlangen-Nuremberg, 91054 Erlangen, GermanyVirology Division, SEALS, Department of Microbiology, Prince of Wales Hospital, Randwick, NSW 2031, Sydney, AustraliaVirology Division, SEALS, Department of Microbiology, Prince of Wales Hospital, Randwick, NSW 2031, Sydney, AustraliaDivision of Bioinformatics, Institute of Biochemistry, University of Erlangen-Nuremberg, 91054 Erlangen, GermanyInstitute for Clinical and Molecular Virology, University of Erlangen-Nuremberg, 91054 Erlangen, GermanyThe human cytomegalovirus (HCMV)-encoded protein kinase, pUL97, is considered a cyclin-dependent kinase (CDK) ortholog, due to shared structural and functional characteristics. The primary mechanism of CDK activation is binding to corresponding cyclins, including cyclin T1, which is the usual regulatory cofactor of CDK9. This study provides evidence of direct interaction between pUL97 and cyclin T1 using yeast two-hybrid and co-immunoprecipitation analyses. Confocal immunofluorescence revealed partial colocalization of pUL97 with cyclin T1 in subnuclear compartments, most pronounced in viral replication centres. The distribution patterns of pUL97 and cyclin T1 were independent of HCMV strain and host cell type. The sequence domain of pUL97 responsible for the interaction with cyclin T1 was between amino acids 231–280. Additional co-immunoprecipitation analyses showed cyclin B1 and cyclin A as further pUL97 interaction partners. Investigation of the pUL97-cyclin T1 interaction in an ATP consumption assay strongly suggested phosphorylation of pUL97 by the CDK9/cyclin T1 complex in a substrate concentration-dependent manner. This is the first demonstration of interaction between a herpesviral CDK ortholog and cellular cyclins.http://www.mdpi.com/1999-4915/5/12/3213human cytomegalovirusprotein kinase pUL97cyclins T1, B1 and Aprotein-protein interactionsubstrate phosphorylationinteraction-mediated regulation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Laura Graf Rike Webel Sabrina Wagner Stuart T. Hamilton William D. Rawlinson Heinrich Sticht Manfred Marschall |
spellingShingle |
Laura Graf Rike Webel Sabrina Wagner Stuart T. Hamilton William D. Rawlinson Heinrich Sticht Manfred Marschall The Cyclin-Dependent Kinase Ortholog pUL97 of Human Cytomegalovirus Interacts with Cyclins Viruses human cytomegalovirus protein kinase pUL97 cyclins T1, B1 and A protein-protein interaction substrate phosphorylation interaction-mediated regulation |
author_facet |
Laura Graf Rike Webel Sabrina Wagner Stuart T. Hamilton William D. Rawlinson Heinrich Sticht Manfred Marschall |
author_sort |
Laura Graf |
title |
The Cyclin-Dependent Kinase Ortholog pUL97 of Human Cytomegalovirus Interacts with Cyclins |
title_short |
The Cyclin-Dependent Kinase Ortholog pUL97 of Human Cytomegalovirus Interacts with Cyclins |
title_full |
The Cyclin-Dependent Kinase Ortholog pUL97 of Human Cytomegalovirus Interacts with Cyclins |
title_fullStr |
The Cyclin-Dependent Kinase Ortholog pUL97 of Human Cytomegalovirus Interacts with Cyclins |
title_full_unstemmed |
The Cyclin-Dependent Kinase Ortholog pUL97 of Human Cytomegalovirus Interacts with Cyclins |
title_sort |
cyclin-dependent kinase ortholog pul97 of human cytomegalovirus interacts with cyclins |
publisher |
MDPI AG |
series |
Viruses |
issn |
1999-4915 |
publishDate |
2013-12-01 |
description |
The human cytomegalovirus (HCMV)-encoded protein kinase, pUL97, is considered a cyclin-dependent kinase (CDK) ortholog, due to shared structural and functional characteristics. The primary mechanism of CDK activation is binding to corresponding cyclins, including cyclin T1, which is the usual regulatory cofactor of CDK9. This study provides evidence of direct interaction between pUL97 and cyclin T1 using yeast two-hybrid and co-immunoprecipitation analyses. Confocal immunofluorescence revealed partial colocalization of pUL97 with cyclin T1 in subnuclear compartments, most pronounced in viral replication centres. The distribution patterns of pUL97 and cyclin T1 were independent of HCMV strain and host cell type. The sequence domain of pUL97 responsible for the interaction with cyclin T1 was between amino acids 231–280. Additional co-immunoprecipitation analyses showed cyclin B1 and cyclin A as further pUL97 interaction partners. Investigation of the pUL97-cyclin T1 interaction in an ATP consumption assay strongly suggested phosphorylation of pUL97 by the CDK9/cyclin T1 complex in a substrate concentration-dependent manner. This is the first demonstration of interaction between a herpesviral CDK ortholog and cellular cyclins. |
topic |
human cytomegalovirus protein kinase pUL97 cyclins T1, B1 and A protein-protein interaction substrate phosphorylation interaction-mediated regulation |
url |
http://www.mdpi.com/1999-4915/5/12/3213 |
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