1ab4
From Proteopedia
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| - | [[Image:1ab4.gif|left|200px]] | + | [[Image:1ab4.gif|left|200px]] |
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| - | '''59KDA FRAGMENT OF GYRASE A FROM E. COLI''' | + | {{Structure |
| + | |PDB= 1ab4 |SIZE=350|CAPTION= <scene name='initialview01'>1ab4</scene>, resolution 2.8Å | ||
| + | |SITE= | ||
| + | |LIGAND= | ||
| + | |ACTIVITY= [http://en.wikipedia.org/wiki/DNA_topoisomerase_(ATP-hydrolyzing) DNA topoisomerase (ATP-hydrolyzing)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=5.99.1.3 5.99.1.3] | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''59KDA FRAGMENT OF GYRASE A FROM E. COLI''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1AB4 is a [ | + | 1AB4 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AB4 OCA]. |
==Reference== | ==Reference== | ||
| - | Crystal structure of the breakage-reunion domain of DNA gyrase., Morais Cabral JH, Jackson AP, Smith CV, Shikotra N, Maxwell A, Liddington RC, Nature. 1997 Aug 28;388(6645):903-6. PMID:[http:// | + | Crystal structure of the breakage-reunion domain of DNA gyrase., Morais Cabral JH, Jackson AP, Smith CV, Shikotra N, Maxwell A, Liddington RC, Nature. 1997 Aug 28;388(6645):903-6. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9278055 9278055] |
[[Category: DNA topoisomerase (ATP-hydrolyzing)]] | [[Category: DNA topoisomerase (ATP-hydrolyzing)]] | ||
[[Category: Escherichia coli]] | [[Category: Escherichia coli]] | ||
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[[Category: topoisomerase ii]] | [[Category: topoisomerase ii]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 09:55:21 2008'' |
Revision as of 07:55, 20 March 2008
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| , resolution 2.8Å | |||||||
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| Activity: | DNA topoisomerase (ATP-hydrolyzing), with EC number 5.99.1.3 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
59KDA FRAGMENT OF GYRASE A FROM E. COLI
Overview
DNA gyrase is a type II DNA topoisomerase from bacteria that introduces supercoils into DNA. It catalyses the breakage of a DNA duplex (the G segment), the passage of another segment (the T segment) through the break, and then the reunification of the break. This activity involves the opening and dosing of a series of molecular 'gates' which is coupled to ATP hydrolysis. Here we present the crystal structure of the 'breakage-reunion' domain of the gyrase at 2.8 A resolution. Comparison of the structure of this 59K (relative molecular mass, 59,000) domain with that of a 92K fragment of yeast topoisomerase II reveals a very different quaternary organization, and we propose that the two structures represent two principal conformations that participate in the enzymatic pathway. The gyrase structure reveals a new dimer contact with a grooved concave surface for binding the G segment and a cluster of conserved charged residues surrounding the active-site tyrosines. It also shows how breakage of the G segment can occur and, together with the topoisomerase II structure, suggests a pathway by which the T segment can be released through the second gate of the enzyme. Mutations that confer resistance to the quinolone antibacterial agents cluster at the new dimer interface, indicating how these drugs might interact with the gyrase-DNA complex.
About this Structure
1AB4 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Crystal structure of the breakage-reunion domain of DNA gyrase., Morais Cabral JH, Jackson AP, Smith CV, Shikotra N, Maxwell A, Liddington RC, Nature. 1997 Aug 28;388(6645):903-6. PMID:9278055
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