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Directional mechanical stability of Bacteriophage φ29 motor’s 3WJ-pRNA: Extraordinary robustness along portal axis

Zhonghe Xu; Yang Sun; Jeffrey K. Weber; Yi Cao; Wei Wang; Daniel Jasinski; Peixuan Guo; Ruhong Zhou; Jingyuan Li

Title:
Directional mechanical stability of Bacteriophage φ29 motor’s 3WJ-pRNA: Extraordinary robustness along portal axis
Author(s):
Xu, Zhonghe
Sun, Yang
Weber, Jeffrey K.
Cao, Yi
Wang, Wei
Jasinski, Daniel
Guo, Peixuan
Zhou, Ruhong
Li, Jingyuan
Date:
Type:
Articles
Department(s):
Chemistry
Volume:
3
Persistent URL:
Book/Journal Title:
Science Advances
Abstract:
The molecular motor exploited by bacteriophage φ29 to pack DNA into its capsid is regarded as one of the most powerful mechanical devices present in viral, bacterial, and eukaryotic systems alike. Acting as a linker element, a prohead RNA (pRNA) effectively joins the connector and ATPase (adenosine triphosphatase) components of the φ29 motor. During DNA packing, this pRNA needs to withstand enormous strain along the capsid’s portal axis—how this remarkable stability is achieved remains to be elucidated. We investigate the mechanical properties of the φ29 motor’s three-way junction (3WJ)–pRNA using a combined steered molecular dynamics and atomic force spectroscopy approach. The 3WJ exhibits strong resistance to stretching along its coaxial helices, demonstrating its super structural robustness. This resistance disappears, however, when external forces are applied to the transverse directions. From a molecular standpoint, we demonstrate that this direction-dependent stability can be attributed to two Mg clamps that cooperate and generate mechanical resistance in the pRNA’s coaxial direction. Our results suggest that the asymmetric nature of the 3WJ’s mechanical stability is entwined with its biological function: Enhanced rigidity along the portal axis is likely essential to withstand the strain caused by DNA condensation, and flexibility in other directions should aid in the assembly of the pRNA and its association with other motor components.
Subject(s):
Biophysics
Chemistry
Bacteriophages
Molecular dynamics
Atomic force microscopy
Stability
Publisher DOI:
https://doi.org/10.1126/sciadv.1601684
Item views
34
Metadata:
text | xml
Suggested Citation:
Zhonghe Xu, Yang Sun, Jeffrey K. Weber, Yi Cao, Wei Wang, Daniel Jasinski, Peixuan Guo, Ruhong Zhou, Jingyuan Li, , Directional mechanical stability of Bacteriophage φ29 motor’s 3WJ-pRNA: Extraordinary robustness along portal axis, Columbia University Academic Commons, .

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