The ABCE1 capsid assembly pathway is conserved between primate lentiviruses and the non-primate lentivirus feline immunodeficiency virus

Reed, Jonathan C.; Westergreen, Nick; Barajas, Brook C.; Ressler, Dylan T. B.; Phuong, Daryl J.; Swain, J. Victor; Lingappa, Vishwanath R.; Lingappa, Jaisri R.

doi:10.1101/183848

2017

DOI: 10.1101/183848

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The ABCE1 capsid assembly pathway is conserved between primate lentiviruses and the non-primate lentivirus feline immunodeficiency virus

Jonathan C. Reed¹,

Nick Westergreen²,

Brook C. Barajas

et al.

Abstract: 24During immature capsid assembly in cells, the Gag protein of HIV-1 and other primate lentiviruses 25 co-opts a host RNA granule, forming a pathway of assembly intermediates that contains host components, 26including two cellular enzymes shown to facilitate assembly, ABCE1 and DDX6. Here we asked whether 27 a non-primate lentivirus, feline immunodeficiency virus (FIV), also forms such RNA-granule-derived 28 intracellular capsid assembly intermediates. First, we found that, unlike for HIV-1, the FIV completed … Show more

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Formation of RNA Granule-Derived Capsid Assembly Intermediates Appears To Be Conserved between Human Immunodeficiency Virus Type 1 and the Nonprimate Lentivirus Feline Immunodeficiency Virus

Reed¹,

Westergreen²,

Barajas

et al. 2018

J Virol

Self Cite

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During immature capsid assembly in cells, human immunodeficiency virus type 1 (HIV-1) Gag co-opts a host RNA granule, forming a pathway of intracellular assembly intermediates containing host components, including two cellular facilitators of assembly, ABCE1 and DDX6. A similar assembly pathway has been observed for other primate lentiviruses. Here we asked whether feline immunodeficiency virus (FIV), a nonprimate lentivirus, also forms RNA granule-derived capsid assembly intermediates. First, we showed that the released FIV immature capsid and a large FIV Gag-containing intracellular complex are unstable during analysis, unlike for HIV-1. We identified harvest conditions, including cross-linking, that overcame this problem, revealing a series of FIV Gag-containing complexes corresponding in size to HIV-1 assembly intermediates. Previously, we showed that assembly-defective HIV-1 Gag mutants are arrested at specific assembly intermediates; here we identified four assembly-defective FIV Gag mutants, including three not previously studied, and demonstrated that they appear to be arrested at the same intermediate as the cognate HIV-1 mutants. Further evidence that these FIV Gag-containing complexes correspond to assembly intermediates came from coimmunoprecipitations demonstrating that endogenous ABCE1 and the RNA granule protein DDX6 are associated with FIV Gag, as shown previously for HIV-1 Gag, but are not associated with a ribosomal protein, at steady state. Additionally, we showed that FIV Gag associates with another RNA granule protein, DCP2. Finally, we validated the FIV Gag-ABCE1 and FIV Gag-DCP2 interactions with proximity ligation assays demonstrating colocalization Together, these data support a model in which primate and nonprimate lentiviruses form intracellular capsid assembly intermediates derived from nontranslating host RNA granules. Like HIV-1 Gag, FIV Gag assembles into immature capsids; however, it is not known whether FIV Gag progresses through a pathway of immature capsid assembly intermediates derived from host RNA granules, as shown for HIV-1 Gag. Here we showed that FIV Gag forms complexes that resemble HIV-1 capsid assembly intermediates in size and in their association with ABCE1 and DDX6, two host facilitators of HIV-1 immature capsid assembly that are found in HIV-1 assembly intermediates. Our studies also showed that known and novel assembly-defective FIV Gag mutants fail to progress past putative intermediates in a pattern resembling that observed for HIV-1 Gag mutants. Finally, we used imaging to demonstrate colocalization of FIV Gag with ABCE1 and with the RNA granule protein DCP2. Thus, we conclude that formation of assembly intermediates derived from host RNA granules is likely conserved between primate and nonprimate lentiviruses and could provide targets for future antiviral strategies.

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Formation of RNA Granule-Derived Capsid Assembly Intermediates Appears To Be Conserved between Human Immunodeficiency Virus Type 1 and the Nonprimate Lentivirus Feline Immunodeficiency Virus

Reed¹,

Westergreen²,

Barajas

et al. 2018

J Virol

Self Cite

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The ABCE1 capsid assembly pathway is conserved between primate lentiviruses and the non-primate lentivirus feline immunodeficiency virus

Cited by 1 publication

References 75 publications

Formation of RNA Granule-Derived Capsid Assembly Intermediates Appears To Be Conserved between Human Immunodeficiency Virus Type 1 and the Nonprimate Lentivirus Feline Immunodeficiency Virus

Formation of RNA Granule-Derived Capsid Assembly Intermediates Appears To Be Conserved between Human Immunodeficiency Virus Type 1 and the Nonprimate Lentivirus Feline Immunodeficiency Virus

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