Structural Dynamics and Mechanochemical Coupling in DNA Gyrase
نویسندگان
چکیده
منابع مشابه
Structural Dynamics and Mechanochemical Coupling in DNA Gyrase.
Gyrase is a molecular motor that harnesses the free energy of ATP hydrolysis to perform mechanical work on DNA. The enzyme specifically introduces negative supercoiling in a process that must coordinate fuel consumption with DNA cleavage and religation and with numerous conformational changes in both the protein and DNA components of a large nucleoprotein complex. Here we present a current unde...
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Type 2A DNA topoisomerases (Topo2A) remodel DNA topology during replication, transcription and chromosome segregation. These multisubunit enzymes catalyze the transport of a double-stranded DNA through a transient break formed in another duplex. The bacterial DNA gyrase, a target for broad-spectrum antibiotics, is the sole Topo2A enzyme able to introduce negative supercoils. We reveal here for ...
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Escherichia coli DNA gyrase catalyzes negative supercoiling of closed duplex DNA at the expense of ATP. Two additional activities of the enzyme that have illuminated the energy coupling component of the supercoiling reaction are the DNA-dependent hydrolysis of ATP to ADP and P(i) and the alteration by ATP of the DNA site specificity of the gyrase cleavage reaction. This cleavage of both DNA str...
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ژورنال
عنوان ژورنال: Journal of Molecular Biology
سال: 2016
ISSN: 0022-2836
DOI: 10.1016/j.jmb.2016.03.016