Difference between revisions of "PMID:7559669"
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| + | {| id="U5054f8fd43b93" class=" tableEdit PMID_info_table" | ||
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| + | !align=left |Citation | ||
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| + | '''Peng, H and Marians, KJ ''' (1995) The interaction of Escherichia coli topoisomerase IV with DNA. ''J. Biol. Chem.'' '''270''':25286-90 | ||
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| + | !align=left |Abstract | ||
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| + | The two type II topoisomerases in Escherichia coli, DNA gyrase and topoisomerase (Topo) IV, share considerable amino acid sequence similarity, yet they have distinctive topoisomerization activities. Only DNA gyrase can supercoil relaxed DNA, whereas during oriC DNA replication in vitro, only Topo IV can support the final stages of replication, processing of the late intermediate and decatenation of the daughter molecules. In order to develop an understanding for the basis of the differential activities of these two enzymes, we have initiated a characterization of Topo IV binding to DNA. We find that unlike gyrase, Topo IV neither constrains DNA in a positive supercoil when it binds nor protects a 150-base pair region of DNA from digestion with micro-coccal nuclease. Consistent with this, DNase I footprinting experiments showed that Topo IV protected a 34-base pair region roughly centered about the topoisomerase-induced cleavage site. In addition, Topo IV preferentially bound supercoiled rather than relaxed DNA. Thus, the DNA binding characteristics of Topo IV are more akin to those of the type II eukaryotic enzymes rather than those of its prokaryotic partner. | ||
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| + | !align=left |Links | ||
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| + | [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=7559669 PubMed] | ||
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| + | !align=left |Keywords | ||
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| + | Base Sequence; DNA/metabolism; DNA Topoisomerase IV; DNA Topoisomerases, Type II/metabolism; DNA, Superhelical/metabolism; Escherichia coli/enzymology; Molecular Sequence Data | ||
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| + | ==Main Points of the Paper == | ||
| + | {{LitSignificance}} | ||
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| + | == Materials and Methods Used == | ||
| + | {{LitMaterials}} | ||
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| + | ==Phenotype Annotations== | ||
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| + | {| id="K5054f8fd58079" class=" tableEdit Phenotype_Table_2" | ||
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| + | !|Phenotype of!!Taxon Information!!Genotype Information (if known)!!Condition Information!!OMP ID!!OMP Term Name!!ECO ID!!ECO Term Name!!Notes!!Status | ||
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| + | ==Notes== | ||
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| + | ==References== | ||
| + | {{RefHelp}} | ||
| + | <references/> | ||
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| + | [[Category:Publication]] | ||
Latest revision as of 16:54, 15 September 2012
| Citation |
Peng, H and Marians, KJ (1995) The interaction of Escherichia coli topoisomerase IV with DNA. J. Biol. Chem. 270:25286-90 |
|---|---|
| Abstract |
The two type II topoisomerases in Escherichia coli, DNA gyrase and topoisomerase (Topo) IV, share considerable amino acid sequence similarity, yet they have distinctive topoisomerization activities. Only DNA gyrase can supercoil relaxed DNA, whereas during oriC DNA replication in vitro, only Topo IV can support the final stages of replication, processing of the late intermediate and decatenation of the daughter molecules. In order to develop an understanding for the basis of the differential activities of these two enzymes, we have initiated a characterization of Topo IV binding to DNA. We find that unlike gyrase, Topo IV neither constrains DNA in a positive supercoil when it binds nor protects a 150-base pair region of DNA from digestion with micro-coccal nuclease. Consistent with this, DNase I footprinting experiments showed that Topo IV protected a 34-base pair region roughly centered about the topoisomerase-induced cleavage site. In addition, Topo IV preferentially bound supercoiled rather than relaxed DNA. Thus, the DNA binding characteristics of Topo IV are more akin to those of the type II eukaryotic enzymes rather than those of its prokaryotic partner. |
| Links | |
| Keywords |
Base Sequence; DNA/metabolism; DNA Topoisomerase IV; DNA Topoisomerases, Type II/metabolism; DNA, Superhelical/metabolism; Escherichia coli/enzymology; Molecular Sequence Data |
| edit table |
Main Points of the Paper
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Materials and Methods Used
Please list the materials and methods used in this paper (strains, plasmids, antibodies, etc).
Phenotype Annotations
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<protect>
| Phenotype of | Taxon Information | Genotype Information (if known) | Condition Information | OMP ID | OMP Term Name | ECO ID | ECO Term Name | Notes | Status |
|---|---|---|---|---|---|---|---|---|---|
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</protect>
Notes
References
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