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Identification of a region in the common amino-terminal domain of hendra virus P, V, and W proteins responsible for phase transition and amyloid formation

Articolo
Data di Pubblicazione:
2021
Abstract:
Henipaviruses are BSL-4 zoonotic pathogens responsible in humans for severe encephalitis. Their V protein is a key player in the evasion of the host innate immune response. We previously showed that the Henipavirus V proteins consist of a long intrinsically disordered N- terminal domain (NTD) and a β-enriched C-terminal domain (CTD). These terminals are critical for V binding to DDB1, which is a cellular protein that is a component of the ubiquitin ligase E3 complex, as well as binding to MDA5 and LGP2, which are two host sensors of viral RNA. Here, we serendipitously discovered that the Hendra virus V protein undergoes a liquid-to-hydrogel phase transition and identified the V region responsible for this phenomenon. This region, referred to as PNT3 and encompassing residues 200–310, was further investigated using a combination of biophysical and structural approaches. Congo red binding assays, together with negative-staining transmisison electron microscopy (TEM) studies, show that PNT3 forms amyloid-like fibrils. Fibrillation abilities are dramatically reduced in a rationally designed PNT3 variant in which a stretch of three contiguous tyrosines, falling within an amyloidogenic motif, were replaced by three alanines. Worthy to note, Congo red staining experiments provided hints that these amyloid-like fibrils form not only in vitro but also in cellula after transfection or infection. The present results set the stage for further investigations aimed at assessing the functional role of phase separation and fibrillation by the Henipavirus V proteins.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
Amyloids; CR binding assays; Fibrils; Hendra virus; Hsp70; Intrinsically disordered proteins; Phase separation and transitions; SAXS; TEM; V protein
Elenco autori:
Salladini E.; Gondelaud F.; Nilsson J.F.; Pesce G.; Bignon C.; Murrali M.G.; Fabre R.; Pierattelli R.; Kajava A.V.; Horvat B.; Gerlier D.; Mathieu C.; Longhi S.
Link alla scheda completa:
https://iris.unito.it/handle/2318/1944386
Link al Full Text:
https://iris.unito.it/retrieve/handle/2318/1944386/1210845/12.%20Salladini%20et%20al.%20(2021).pdf
Pubblicato in:
BIOMOLECULES
Journal
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Settori (18)


LS1_2 - Biochemistry - (2022)

LS1_8 - Structural biology - (2022)

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