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National Academy of Sciences, Proceedings of the National Academy of Sciences, 47(117), p. 29702-29711, 2020

DOI: 10.1073/pnas.1920323117

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Correlated cryogenic fluorescence microscopy and electron cryo-tomography shows that exogenous TRIM5α can form hexagonal lattices or autophagy aggregates in vivo

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Data provided by SHERPA/RoMEO

Abstract

Significance One of the most notable features of TRIM5 proteins is their ability to restrict retroviral infections by binding viral capsids. TRIM5α forms highly dynamic puncta of various sizes, and, when purified, hexagonal nets on the surface of HIV virions, but the molecular ultrastructure of the cellular bodies and the relationship of the in vitro nets to HIV restriction has remained unclear. To define the cellular ultrastructure underlying the punctate and dynamic nature of YFP-rhTRIM5α bodies, we applied cryogenic correlated light and electron microscopy combined with electron cryo-tomography to TRIM5α bodies and observed YFP-rhTRIM5α-localization to organelles found along the aggrephagy branch of the autophagy pathway. Consistent with previous work, we also found that TRIM5α forms hexagonal nets inside cells.