5BQ5

Crystal structure of the IstB AAA+ domain bound to ADP-BeF3

Summary for 5BQ5

• Entry DOI: 10.2210/pdb5bq5/pdb
• Descriptor: Insertion sequence IS5376 putative ATP-binding protein, ADENOSINE-5'-DIPHOSPHATE, MAGNESIUM ION, ... (5 entities in total)
• Functional Keywords: aaa+, atpase, transposition, dna binding, atp-binding protein
• Biological source: Geobacillus stearothermophilus
• Total number of polymer chains: 3
• Total formula weight: 67462.41

Authors

Arias-Palomo, E.,Berger, J.M. (deposition date: 2015-05-28, release date: 2015-09-02, Last modification date: 2024-11-06)

Primary citation

Arias-Palomo, E.,Berger, J.M.
An Atypical AAA+ ATPase Assembly Controls Efficient Transposition through DNA Remodeling and Transposase Recruitment.
Cell, 162:860-871, 2015

PubMed Abstract: 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.

PubMed: 26276634
DOI: 10.1016/j.cell.2015.07.037

Experimental method

X-RAY DIFFRACTION (2.1 Å)