4ZNI

Thermus Phage P74-26 Large Terminase ATPase domain (I 2 3 space group)

Summary for 4ZNI

• Entry DOI: 10.2210/pdb4zni/pdb
• Related: 4ZNJ 4ZNK 4ZNL
• Descriptor: Phage terminase large subunit, SULFATE ION (3 entities in total)
• Functional Keywords: dna translocation, viral protein
• Biological source: Thermus phage P7426
• Total number of polymer chains: 1
• Total formula weight: 32253.17

Authors

Hilbert, B.J.,Hayes, J.A.,Stone, N.P.,Duffy, C.M.,Sankaran, B.,Kelch, B.A. (deposition date: 2015-05-04, release date: 2015-07-08, Last modification date: 2024-03-06)

Primary citation

Hilbert, B.J.,Hayes, J.A.,Stone, N.P.,Duffy, C.M.,Sankaran, B.,Kelch, B.A.
Structure and mechanism of the ATPase that powers viral genome packaging.
Proc.Natl.Acad.Sci.USA, 112:E3792-E3799, 2015

PubMed Abstract: Many viruses package their genomes into procapsids using an ATPase machine that is among the most powerful known biological motors. However, how this motor couples ATP hydrolysis to DNA translocation is still unknown. Here, we introduce a model system with unique properties for studying motor structure and mechanism. We describe crystal structures of the packaging motor ATPase domain that exhibit nucleotide-dependent conformational changes involving a large rotation of an entire subdomain. We also identify the arginine finger residue that catalyzes ATP hydrolysis in a neighboring motor subunit, illustrating that previous models for motor structure need revision. Our findings allow us to derive a structural model for the motor ring, which we validate using small-angle X-ray scattering and comparisons with previously published data. We illustrate the model's predictive power by identifying the motor's DNA-binding and assembly motifs. Finally, we integrate our results to propose a mechanistic model for DNA translocation by this molecular machine.

PubMed: 26150523
DOI: 10.1073/pnas.1506951112

Experimental method

X-RAY DIFFRACTION (2.097 Å)