Abstract:
:The binding of SopA to the promoter region of its own gene, in which four copies of SopA's recognition sequence, 5'-CTTTGC-3', are arrayed asymmetrically, was examined in vitro. Titration using electrophoretic mobility shift assay showed that the stoichiometry of SopA protomers to the promoter-region DNA is 4 and that the binding is highly co-operative. The co-operativity was corroborated by EMSA and DNase I footprinting for a number of mutant DNA fragments in which 5'-CTTTGC-3' was changed to 5'-CTTACG-3'. EMSA in the style of circular permutation showed that SopA bends DNA. Mutation at either outermost binding site had a different effect on DNA bending by SopA, reflecting the asymmetry in the arrangement of the binding sites, for which the results of DNase I footprinting were in agreement. Gel filtration chromatography and analytical ultracentrifugation of free SopA showed that the protein can exist as a monomer and oligomers in the absence of ATP. Hence, the results indicate that the co-operativity in SopA's DNA binding is based on its intrinsic protein-protein interaction modified by DNA interaction.
journal_name
J Biochemjournal_title
Journal of biochemistryauthors
Komai M,Umino M,Hanai Rdoi
10.1093/jb/mvq151subject
Has Abstractpub_date
2011-04-01 00:00:00pages
455-61issue
4eissn
0021-924Xissn
1756-2651pii
mvq151journal_volume
149pub_type
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pub_type: 杂志文章
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pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a124155
更新日期:1993-08-01 00:00:00
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pub_type: 杂志文章
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pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a132174
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journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a122949
更新日期:1989-11-01 00:00:00
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pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a134301
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pub_type: 杂志文章
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更新日期:2015-09-01 00:00:00
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pub_type: 杂志文章,评审
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更新日期:2018-03-01 00:00:00
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pub_type: 杂志文章
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journal_title:Journal of biochemistry
pub_type: 杂志文章
doi:10.1093/oxfordjournals.jbchem.a133659
更新日期:1981-12-01 00:00:00
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pub_type: 杂志文章
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journal_title:Journal of biochemistry
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更新日期:1982-11-01 00:00:00
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更新日期:1999-05-01 00:00:00
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journal_title:Journal of biochemistry
pub_type: 杂志文章
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更新日期:1980-01-01 00:00:00
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journal_title:Journal of biochemistry
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doi:10.1093/oxfordjournals.jbchem.a133000
更新日期:1980-08-01 00:00:00
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journal_title:Journal of biochemistry
pub_type: 杂志文章
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更新日期:2014-05-01 00:00:00