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The control of DNA replication and also chromosomal DNA synthesis itself are highly co-ordinated processes. To this end the replication proteins ORC (origin recognition complex), CDC6 (cell division cycle), MCM2 to MCM7 (minichromosome maintenance), CDC45, pol-prim (DNA polymerase alpha-primase), and RPA (replication protein A) must co-operate during cellular DNA replication.
The activity of the replication and regulatory proteins is controlled by protein-protein interactions. In order to analyse the physical interactions, we have used various biochemical and cell biological techniques e.g., co-immunoprecipitation, fluorescence (cross) correlation spectroscopy (F(C)CS), a modified ELISA technique, fluorescence recovery after photobleaching (FRAP), functional test systems, and biophysical methods. In addition, we also analyse physical interactions by binding of purified proteins with radioactively labelled or fluorescence labelled interaction partners. Moreover, we have examined the functional interactions of pol-prim and RPA with kinases and phosphatases. Moreover, we have produced phosphorylation mutants of pol-prim and RPA and phosphopeptide-specific antibodies. To study their activities in living cells we expressed fusion protein of green fluorescent proteins and wild type as well as mutant proteins in human cells and have carried FCS and FRAP.
Tikhanovich,I and
Nasheuer, H.P. (2010)
Host-Specific Replication of BK Virus DNA in Mouse Cell Extracts is Independently Controlled by DNA Polymerase{alpha}-Primase and Inhibitory Activities. J Virol, 84: 6636-6644.
Fleming, R.M.T., Thiele, I. and
Nasheuer H.P. (2009)
Quatitative assignment of reaction directionality in constraint-based models of metabolism:Application to Esherichia coli. Biophysical Chemistry, 145: 47-56.
Stephan, H., Concannon,C., Kremmer, E., Carty, M.P. and
Nasheuer, H.P. (2009)
Ionizing radiation-dependent and independent phosphorylation of the 32 kDa subunit of replication protein A during mitosis. Nuclecic Acids Res, 37:6028-6041.
Mahon, C., Liang, B., Tikhanovich, I.S., Abend, J.R., Imperiale, M.J.,
Nasheuer, H.P.* and Folk, W.R.*. (2009)
Restriction of human polyomavirus BKV DNA replication in murine cells and extracts, J.Virol. 83:5708-5717. * corresponding authors.
Bauerschmidt, C., Pollok, S., Kremmer, E.,
Nasheuer, H.P.* and Grosse F.* (2007) Interactions of Human Cdc45 with the Mcm2-7 complex, the GINS complex and DNA polymerases and during S phase. Genes to Cells 12: 745-358. *corresponding authors
Braet, C., Stephan, H., Dobbie, I. M., Togashi, D. M., Ryder, A. G., Foldes-Papp, Z., Lowndes N. and
Nasheuer, H. P. (2007). Mobility and distribution of replication protein A in living cells using fluorescence correlation spectroscopy. Exp Mol Pathol. 82: 156-162.
Full Publication List
Lab members
Ronan Broderick: Postgraduate Student
Aoife Corduff: Postgraduate Student
Dr Mark Harvey
Dr Siva R.K.Ramadurai
Irina Tikhanovich
Course director for 3rd Biochemistry lecture course and practicals (jointly with Dr. Peter Creighton)
Student consultation hours: Wednesday and Thursday 14:00 to 17:00
Biochemistry for 2nd year Science students ’Carbohydrate Metabolism’
Biochemistry for 3rd year Science students ’Cellular organisation and functions’ ’DNA replication’ and ’Cell signalling’
Biochemistry lab classes for 3rd year Science students
Biochemistry for 4th year Science students ’Cell structure, cell cycle control, and mechanisms of eukaryotic DNA replication’
Biochemistry for 4th year Biotechnology students ’Animal tissue culture’
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