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. 1992 Dec 1;89(23):11136–11140. doi: 10.1073/pnas.89.23.11136

Active complete in vitro replication of nodavirus RNA requires glycerophospholipid.

S X Wu 1, P Ahlquist 1, P Kaesberg 1
PMCID: PMC50504  PMID: 1454791

Abstract

Flockhouse virus (FHV) is a member of the nodavirus group of positive-strand RNA viruses. In the absence of additional compounds, a template-dependent RNA-dependent RNA polymerase extracted from FHV-infected cells synthesizes complementary (-)-strand copies of added FHV RNA to yield a double-stranded RNA product. Upon addition of glycerophospholipid (GPL), this system reproducibly carries out complete highly active replication of added FHV RNA, producing newly synthesized (+)-strand RNA in predominantly single-stranded RNA form. This accounts for previously observed effects of Lipofectin (a mixture of GPL and cationic lipid) in the system. All tested neutral and negatively charged GPLs except phosphatidic acid support complete FHV RNA replication in this in vitro system, as do phospholipid extracts from uninfected and FHV-infected cells. Neither sphingomyelin, a membrane phospholipid that is not derived from glycerol, nor cholesterol supported FHV RNA replication. Testing of compounds derived from GPL shows that the ability of active GPL to support FHV (+)-strand RNA synthesis is dependent on the structures of both the head group and the acyl chains. Neither the phosphorylated head group nor the diacylglycerol lipid moiety alone supports RNA replication. The length and saturation of acyl chains strongly influence the ability of GPL to support RNA replication. Other characteristics of this in vitro RNA replication system and the possible role played by membranes and their components in FHV RNA replication are discussed.

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