| Structural highlights
Function
A0A481XTV0_9FLAV Component of the viral RNA replication complex that functions in virion assembly and antagonizes the host immune response.[ARBA:ARBA00024317] Functions as a signal peptide for NS4B and is required for the interferon antagonism activity of the latter.[ARBA:ARBA00003504]
Publication Abstract from PubMed
Cleavage of the flavivirus premembrane (prM) structural protein during maturation can be inefficient. The contribution of partially mature flavivirus virions that retain uncleaved prM to pathogenesis during primary infection is unknown. To investigate this question, we characterized the functional properties of newly-generated dengue virus (DENV) prM-reactive monoclonal antibodies (mAbs) in vitro and using a mouse model of DENV disease. Anti-prM mAbs neutralized DENV infection in a virion maturation state-dependent manner. Alanine scanning mutagenesis and cryoelectron microscopy of anti-prM mAbs in complex with immature DENV defined two modes of attachment to a single antigenic site. In vivo, passive transfer of intact anti-prM mAbs resulted in an antibody-dependent enhancement of disease. However, protection against DENV-induced lethality was observed when the transferred mAbs were genetically modified to inhibit their ability to interact with Fcgamma receptors. These data establish that in addition to mature forms of the virus, partially mature infectious prM(+) virions can also contribute to pathogenesis during primary DENV infections.
prM-reactive antibodies reveal a role for partially mature virions in dengue virus pathogenesis.,A Dowd K, Sirohi D, D Speer S, VanBlargan LA, Chen RE, Mukherjee S, Whitener BM, Govero J, Aleshnick M, Larman B, Sukupolvi-Petty S, Sevvana M, Miller AS, Klose T, Zheng A, Koenig S, Kielian M, Kuhn RJ, Diamond MS, Pierson TC Proc Natl Acad Sci U S A. 2023 Jan 17;120(3):e2218899120. doi: , 10.1073/pnas.2218899120. Epub 2023 Jan 13. PMID:36638211[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ A Dowd K, Sirohi D, D Speer S, VanBlargan LA, Chen RE, Mukherjee S, Whitener BM, Govero J, Aleshnick M, Larman B, Sukupolvi-Petty S, Sevvana M, Miller AS, Klose T, Zheng A, Koenig S, Kielian M, Kuhn RJ, Diamond MS, Pierson TC. prM-reactive antibodies reveal a role for partially mature virions in dengue virus pathogenesis. Proc Natl Acad Sci U S A. 2023 Jan 17;120(3):e2218899120. doi: , 10.1073/pnas.2218899120. Epub 2023 Jan 13. PMID:36638211 doi:http://dx.doi.org/10.1073/pnas.2218899120
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