Author:
Tonnemacher Susanne,Folly-Klan Marcia,Gazi Anastasia D.,Schäfer Simon,Pénard Esthel,Eberle Regina,Kunz Renate,Walther Paul,Krijnse Locker Jacomine
Abstract
AbstractViruses of the giant virus family are characterized by a structurally conserved scaffold-capsid protein that shapes the icosahedral virion. The vaccinia virus (VACV) scaffold protein D13, however, transiently shapes the newly assembled viral membrane in to a sphere and is absent from the mature brick-shaped virion. In infected cells D13, a 62 kDa polypeptide, forms trimers that arrange in hexamers and a honey-comb like lattice. Membrane association of the D13-lattice may be mediated by A17, an abundant 21 kDa viral membrane protein. Whether membrane binding mediates the formation of the honey-comb lattice or if other factors are involved, remains elusive. Here we show that H7, a 17 kDa protein conserved among poxviruses, mediates proper formation of D13-hexamers, and hence the honey comb lattice and spherical immature virus. Without H7 synthesis D13 trimers assemble into a large 3D network rather than the typical well organized scaffold layer observed in wild-type infection, composed of short D13 tubes of discrete length that are tightly associated with the endoplasmic reticulum (ER). The data show an unexpected role for H7 in D13 organization and imply that formation of the honey-comb, hexagonal, lattice is essential for VACV membrane assembly and production of infectious progeny. The data are discussed with respect to scaffold proteins of other giant viruses.
Funder
LOEWE center DRUID
Paul-Ehrlich-Institut - Bundesinstitut für Impfstoffe und biomedizinische Arzneimittel
Publisher
Springer Science and Business Media LLC
Cited by
2 articles.
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1. Assembly and Evolution of Poxviruses;Advances in Experimental Medicine and Biology;2024
2. Poxvirus under the eyes of electron microscope;Applied Microscopy;2022-11-14