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-Structure paper
タイトル | An Atypical AAA+ ATPase Assembly Controls Efficient Transposition through DNA Remodeling and Transposase Recruitment. |
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ジャーナル・号・ページ | Cell, Vol. 162, Issue 4, Page 860-871, Year 2015 |
掲載日 | 2015年8月13日 |
![]() | Ernesto Arias-Palomo / James M Berger / ![]() |
PubMed 要旨 | Transposons are ubiquitous genetic elements that drive genome rearrangements, evolution, and the spread of infectious disease and drug-resistance. Many transposons, such as Mu, Tn7, and IS21, require ...Transposons are ubiquitous genetic elements that drive genome rearrangements, evolution, and the spread of infectious disease and drug-resistance. Many transposons, such as Mu, Tn7, and IS21, require regulatory AAA+ ATPases for function. We use X-ray crystallography and cryo-electron microscopy to show that the ATPase subunit of IS21, IstB, assembles into a clamshell-shaped decamer that sandwiches DNA between two helical pentamers of ATP-associated AAA+ domains, sharply bending the duplex into a 180° U-turn. Biochemical studies corroborate key features of the structure and further show that the IS21 transposase, IstA, recognizes the IstB•DNA complex and promotes its disassembly by stimulating ATP hydrolysis. Collectively, these studies reveal a distinct manner of higher-order assembly and client engagement by a AAA+ ATPase and suggest a mechanistic model where IstB binding and subsequent DNA bending primes a selected insertion site for efficient transposition. |
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手法 | EM (単粒子) / X線回折 |
解像度 | 2.1 - 16.0 Å |
構造データ | ![]() EMDB-3031: ![]() EMDB-3032: ![]() PDB-5bq5: |
化合物 | ![]() ChemComp-ADP: ![]() ChemComp-MG: ![]() ChemComp-BEF: ![]() ChemComp-HOH: |
由来 |
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![]() | ATP-binding protein / AAA+ / ATPase / transposition / DNA binding |