Virus capsid expansion driven by the capture of mobile surface loops |
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Authors: | Lee Kelly K Gan Lu Tsuruta Hiro Moyer Crystal Conway James F Duda Robert L Hendrix Roger W Steven Alasdair C Johnson John E |
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Affiliation: | Department of Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037, USA. |
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Abstract: | The capsids of tailed-DNA bacteriophages first assemble as procapsids, which mature by converting into a new form that is strong enough to contain a densely packed viral chromosome. We demonstrate that the intersubunit crosslinking that occurs during maturation of HK97 capsids actually promotes the structural transformation. Small-angle X-ray scattering and crosslinking assays reveal that a shift in the crosslink pattern accompanies conversion of a semimature particle, Expansion Intermediate-I/II, to a more mature state, Balloon. This transition occurs in a switch-like fashion. We find that crosslink formation shifts the global conformational balance to favor the balloon state. A pseudoatomic model of EI-I/II derived from cryo-EM provides insight into the relationship between crosslink formation and conformational switching. |
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