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The success of electron-cryo microscopy (cryo-EM) and image reconstruction of cyclic oligomers, such as the viral and bacteriophage portals, depends on the accurate knowledge of their order of symmetry. A number of statistical methods of image analysis address this problem, but often do not provide unambiguous results. Direct measurement of the oligomeric state of multisubunit protein assemblies is...
Maturation of the bacteriophage HK97 capsid from a precursor (Prohead II) to the mature state (Head II) involves a 60 Å radial expansion. The mature particle is formed by 420 copies of the major capsid protein organized on a T = 7 laevo lattice with each subunit covalently crosslinked to two neighbors. Well-characterized pH 4 expansion intermediates make HK97 valuable for investigating quaternary...
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