1yua
From Proteopedia
(New page: 200px<br /><applet load="1yua" size="450" color="white" frame="true" align="right" spinBox="true" caption="1yua" /> '''C-TERMINAL DOMAIN OF ESCHERICHIA COLI TOPOIS...) |
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'''C-TERMINAL DOMAIN OF ESCHERICHIA COLI TOPOISOMERASE I'''<br /> | '''C-TERMINAL DOMAIN OF ESCHERICHIA COLI TOPOISOMERASE I'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Escherichia coli DNA topoisomerase I catalyzes the interconversion of | + | Escherichia coli DNA topoisomerase I catalyzes the interconversion of different topological forms of DNA. In this paper we describe NMR studies of a 14K C-terminal fragment of this enzyme that binds preferentially to single-stranded DNA and enhances the enzyme's ability to relax negatively supercoiled DNA under high salt conditions. The 1H, 13C, and 15N resonances of the protein were assigned from a number of heteronuclear multidimensional NMR experiments, and the three-dimensional structure of the protein was determined from a total of 2188 NMR-derived restraints. The root-mean-square deviation about the mean coordinate positions for residues 13-120 is 0.68 +/- 0.11 A for the backbone atoms and 1.09 +/- 0.09 A for all heavy atoms. The overall fold, which consists of two four-stranded beta-sheets separated by two helices, differs from other DNA- and RNA-binding proteins such as gene 5, cold shock protein, and hnRNP C. From an analysis of the changes in chemical shift upon the addition of single-stranded DNA, the location of the oligonucleotide binding site was determined. The binding site consists of a beta-sheet containing positively charged and aromatic amino acids and, in spite of its different structure, is similar to that found in other proteins that bind single-stranded oligonucleotides. |
==About this Structure== | ==About this Structure== | ||
| - | 1YUA is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Active as [http://en.wikipedia.org/wiki/DNA_topoisomerase DNA topoisomerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.99.1.2 5.99.1.2] Full crystallographic information is available from [http:// | + | 1YUA is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Active as [http://en.wikipedia.org/wiki/DNA_topoisomerase DNA topoisomerase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.99.1.2 5.99.1.2] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1YUA OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: Fesik, S | + | [[Category: Fesik, S W.]] |
| - | [[Category: Tse-Dinh, Y | + | [[Category: Tse-Dinh, Y C.]] |
[[Category: Yu, L.]] | [[Category: Yu, L.]] | ||
| - | [[Category: Zhu, C | + | [[Category: Zhu, C X.]] |
[[Category: gene-regulating protein]] | [[Category: gene-regulating protein]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:09:10 2008'' |
Revision as of 14:09, 21 February 2008
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C-TERMINAL DOMAIN OF ESCHERICHIA COLI TOPOISOMERASE I
Overview
Escherichia coli DNA topoisomerase I catalyzes the interconversion of different topological forms of DNA. In this paper we describe NMR studies of a 14K C-terminal fragment of this enzyme that binds preferentially to single-stranded DNA and enhances the enzyme's ability to relax negatively supercoiled DNA under high salt conditions. The 1H, 13C, and 15N resonances of the protein were assigned from a number of heteronuclear multidimensional NMR experiments, and the three-dimensional structure of the protein was determined from a total of 2188 NMR-derived restraints. The root-mean-square deviation about the mean coordinate positions for residues 13-120 is 0.68 +/- 0.11 A for the backbone atoms and 1.09 +/- 0.09 A for all heavy atoms. The overall fold, which consists of two four-stranded beta-sheets separated by two helices, differs from other DNA- and RNA-binding proteins such as gene 5, cold shock protein, and hnRNP C. From an analysis of the changes in chemical shift upon the addition of single-stranded DNA, the location of the oligonucleotide binding site was determined. The binding site consists of a beta-sheet containing positively charged and aromatic amino acids and, in spite of its different structure, is similar to that found in other proteins that bind single-stranded oligonucleotides.
About this Structure
1YUA is a Single protein structure of sequence from Escherichia coli. Active as DNA topoisomerase, with EC number 5.99.1.2 Full crystallographic information is available from OCA.
Reference
Solution structure of the C-terminal single-stranded DNA-binding domain of Escherichia coli topoisomerase I., Yu L, Zhu CX, Tse-Dinh YC, Fesik SW, Biochemistry. 1995 Jun 13;34(23):7622-8. PMID:7779808
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