Sequential Phosphorylation of Hepatitis C Virus NS5A Protein Requires the ATP-Binding Domain of NS3 Helicase

Yu, Chun-Chiao; Lin, Pei-Chen; Chiang, Cheng‐Yang; Jen, Shu-Tang; Lai, Yen-Ling; Hsu, Szu-Chun; Lo, Lee‐Chiang; Lin, Jing‐Jer; Chan, Nei-Li; Yu, Minshu

doi:10.1128/jvi.00107-22

Cited by 2 publications

(2 citation statements)

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“…These results are extending earlier findings that NS5A phosphorylation is a process that is regulated by a complex interplay between various viral and cellular proteins within the viral replicase and is critical for RNA replication [21,25,43,76,77]. Recently it was demonstrated that sequential NS5A phosphorylation requires the ATP-binding domain of NS3 helicase domain [77]. Thus, identifying surface mutations within the protease domain, which are also important for NS5A hyperphosphorylation suggests that NS3 might modulate NS5A phosphorylation status by inter-domain co-operations between NS3 protease and helicase domains.…”

Section: Plos Pathogenssupporting

confidence: 90%

“…We observed that D103 and K165, together with L127, constitute a functional platform on the NS3 protease surface that is required for NS5A hyperphosphorylation (Fig 1 ) and RNA replication (Fig 2). These results are extending earlier findings that NS5A phosphorylation is a process that is regulated by a complex interplay between various viral and cellular proteins within the viral replicase and is critical for RNA replication [21,25,43,76,77]. Recently it was demonstrated that sequential NS5A phosphorylation requires the ATP-binding domain of NS3 helicase domain [77].…”

Section: Plos Pathogenssupporting

confidence: 88%

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Characterization of a multipurpose NS3 surface patch coordinating HCV replicase assembly and virion morphogenesis

Isken¹,

Pham

Schwanke³

et al. 2022

PLoS Pathog

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The hepatitis C virus (HCV) life cycle is highly regulated and characterized by a step-wise succession of interactions between viral and host cell proteins resulting in the assembly of macromolecular complexes, which catalyse genome replication and/or virus production. Non-structural (NS) protein 3, comprising a protease and a helicase domain, is involved in orchestrating these processes by undergoing protein interactions in a temporal fashion. Recently, we identified a multifunctional NS3 protease surface patch promoting pivotal protein-protein interactions required for early steps of the HCV life cycle, including NS3-mediated NS2 protease activation and interactions required for replicase assembly. In this work, we extend this knowledge by identifying further NS3 surface determinants important for NS5A hyperphosphorylation, replicase assembly or virion morphogenesis, which map to protease and helicase domain and form a contiguous NS3 surface area. Functional interrogation led to the identification of phylogenetically conserved amino acid positions exerting a critical function in virion production without affecting RNA replication. These findings illustrate that NS3 uses a multipurpose protein surface to orchestrate the step-wise assembly of functionally distinct multiprotein complexes. Taken together, our data provide a basis to dissect the temporal formation of viral multiprotein complexes required for the individual steps of the HCV life cycle.

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