Vaccinia Virus F11 Promotes Viral Spread by Acting as a PDZ-Containing Scaffolding Protein to Bind Myosin-9A and Inhibit RhoA Signaling

The vaccinia F11 protein promotes viral spread by modulating the cortical actin cytoskeleton by inhibiting RhoA signaling via an unknown mechanism. PDZ domains are widely conserved protein interaction modules whose occurrence in viral proteins is unprecedented. We found that F11 contains a central P...

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Bibliographic Details
Published in:Cell host & microbe 2013-07, Vol.14 (1), p.51-62
Main Authors: Handa, Yutaka, Durkin, Charlotte H., Dodding, Mark P., Way, Michael
Format: Article
Language:English
Subjects:
Down-Regulation
Host-Pathogen Interactions
Humans
Myosins - genetics
Myosins - metabolism
PDZ Domains
Protein Binding
rhoA GTP-Binding Protein - genetics
rhoA GTP-Binding Protein - metabolism
Signal Transduction
Vaccinia - enzymology
Vaccinia - genetics
Vaccinia - virology
Vaccinia virus - chemistry
Vaccinia virus - genetics
Vaccinia virus - metabolism
Viral Proteins - chemistry
Viral Proteins - genetics
Viral Proteins - metabolism
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Summary:The vaccinia F11 protein promotes viral spread by modulating the cortical actin cytoskeleton by inhibiting RhoA signaling via an unknown mechanism. PDZ domains are widely conserved protein interaction modules whose occurrence in viral proteins is unprecedented. We found that F11 contains a central PDZ-like domain that is required to downregulate RhoA signaling and enhance viral spread. The PDZ-like domain interacts with the PDZ binding motif of the Rho GTPase-activating protein (GAP) Myosin-9A. In the absence of Myosin-9A, RhoA signaling is not inhibited, resulting in fewer actin tails and reduced virus release concomitant with less viral spread. The loss of Myosin-9A GAP activity or its ability to bind F11 also reduces actin tail formation. Furthermore, the ability of Myosin-9A to promote viral spread depends on F11 binding RhoA. Thus, F11 acts as a functional PDZ-containing scaffolding protein to inhibit RhoA signaling by binding Myosin-9A. •Vaccinia virus F11 protein contains a central PDZ-like domain that regulates RhoA binding•F11 PDZ-like domain is required to inhibit RhoA signaling and promote viral spread•F11 PDZ-like domain interacts with the PDZ binding motif of the RhoGAP Myosin-9A•Myosin-9A GAP activity downregulates RhoA to promote viral spread
ISSN:1931-3128
1934-6069
DOI:10.1016/j.chom.2013.06.006