Binding of high-mobility-group proteins HMG 14 and HMG 17 to DNA and histone H1 as influenced by phosphorylation |
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| Institution: | 1. Chemical Process Engineering and Forest Products Research Centre, Department of Chemical Engineering, University of Coimbra, Rua Sílvio Lima, Polo II, 3030-790 Coimbra, Portugal;2. CICS-UBI, Centro de Investigação em Ciências da Saúde, Faculdade de Ciências da Saúde, Universidade da Beira Interior, 6200-506 Covilhã, Portugal;3. UDI-IPG, Research Unit for Inland Development, Polytechnic Institute of Guarda, Guarda, Portugal;1. Adam Mickiewicz University in Poznań, Poznań, Poland;2. University of Coimbra, Coimbra, Portugal;3. University of Trás-os-Montes and Alto Douro, Vila Real, Portugal;1. Division of Chemical and Biomolecular Engineering, School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore 637459, Singapore;2. Mechanobiology Institute, National University of Singapore, 5A Engineering Drive 1, Singapore 117411, Singapore;3. Department of Obstetrics and Gynaecology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 119074, Singapore;4. Department of Reproductive Medicine, KK Women''s and Children''s Hospital, Singapore 229899, Singapore;5. Cancer and Stem Cell Biology, Duke-NUS Graduate Medical School, Singapore 169857, Singapore;6. Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore 308232, Singapore |
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| Abstract: | We have used affinity chromatography to study the effects of phosphorylation of calf thymus high-mobility-group proteins HMG 14 and HMG 17 on their binding properties towards calf thymus single- and double-stranded DNA and histone H1. Without in vitro phosphorylation, HMG 14 and HMG17 eluted from doble-stranded DNA-columns at 200 mM NaCl. HMG 14 was released from single-stranded DNA-column at 300 mM NaCl and from H1-column at 130 mM NaCl, whereas the corresponding values for HMG 17 were 230 mM and 20 mM, respectively. Phosphorylation of HMG 14 and HMG 17 by cAMP-dependent protein kinase (A-kinase) decreased markedly their affinity (270 mM and 200 mM NaCl, respectively) for single-stranded DNA, whereas HMG 14 phosphorylated by nuclear protein kinase II (NII-kinase) eluted only slightly (290 mM NaCl) ahead of the unphosphorylated protein. HMG 14 phosphorylated by both A-kinase and NII-kinase eluted from double-stranded DNA-columns almost identically (190 mM NaCl) with the unphosphorylated protein. Interestingly, phosphorylation of HMG 14 by NII-kinase increased considerably its affinity for histone H1 and the phosphorylated protein eluted at 200 mM NaCl. Phosphorylation of HMG 14 by A-kinase did not alter its interaction towards histone H1. These results indicate that modification of HMG 14 by phosphorylation at specific sites may have profound effects on its binding properties towards DNA and histone H1, and that HMG 17 has much weaker affinity for single-stranded DNA and histone H1 than HMG 14. |
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