| Autor: |
Lira CB; Department of Genetics, Biosciences Institute, Universidade Estadual Paulista Júlio de Mesquita Filho (UNESP), Botucatu, SP 18618000, Brazil., Gui KE, Perez AM, da Silveira RC, Gava LM, Ramos CH, Cano MI |
| Jazyk: |
angličtina |
| Zdroj: |
Biochimica et biophysica acta [Biochim Biophys Acta] 2009 Feb; Vol. 1790 (2), pp. 119-25. Date of Electronic Publication: 2008 Nov 12. |
| DOI: |
10.1016/j.bbagen.2008.10.011 |
| Abstrakt: |
Replication protein A (RPA) is a single-stranded DNA-binding protein that has been implicated in DNA metabolism and telomere maintenance. Subunit 1 of RPA from Leishmania amazonensis (LaRPA-1) has previously been affinity-purified on a column containing a G-rich telomeric DNA. LaRPA-1 binds and co-localizes with parasite telomeres in vivo. Here we describe the purification and characterization of native recombinant LaRPA-1 (rLaRPA-1). The protein was initially re-solubilized from inclusion bodies by using urea. After dialysis, rLaRPA-1 was soluble but contaminated with DNA, which was removed by an anion-exchange chromatography of the protein solubilized in urea. However, rLaRPA-1 precipitated after dialysis to remove urea. To investigate whether the contaminating DNA was involved in chaperoning the refolding of rLaRPA-1, salmon sperm DNA or heparin was added to the solution before dialysis. The addition of either of these substances prevented the precipitation of rLaRPA-1. The resulting rLaRPA-1 was soluble, correctly folded, and able to bind telomeric DNA. This is the first report showing the characterization of rLaRPA1 and of the importance of additives in chaperoning the refolding of this protein. The availability of rLaRPA-1 should be helpful in assessing the importance of this protein as a potential drug target. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
|
