HCMV‐Encoded Glycoprotein M (UL100) Interacts with Rab11 Effector Protein FIP4
HCMV‐Encoded Glycoprotein M (UL100) Interacts with Rab11 Effector Protein FIP4
Abstract The envelope of human cytomegalovirus (HCMV) consists of a large number of glycoproteins. The most abundant glycoprotein in the HCMV envelope is the glycoprotein M (UL100), which together with glycoprotein N (UL73) form the gM/gN protein complex. Using yeast two‐hybrid screening, we found that the gM carboxy‐terminal cytoplasmic tail (gM‐CT) interacts with FIP4, a Rab11‐GTPase effector protein. Depletion of FIP4 expression in HCMV‐infected cells resulted in a decrease in infectious virus production that was also associated with an alteration of the HCMV assembly compartment (AC) phenotype. A similar phenotype was also observed in HCMV‐infected cells that expressed dominant negative Rab11(S25N). Recently, it has been shown that FIP4 interactions with Rab11 and additionally with Arf6/Arf5 are important for the vesicular transport of proteins in the endosomal recycling compartment (ERC) and during cytokinesis. Surprisingly, FIP4 interaction with gM‐CT limited binding of FIP4 with Arf5/Arf6; however, FIP4 interaction with gM‐CT did not prevent recruitment of Rab11 into the ternary complex. These data argued for a contribution of the ERC during cytoplasmic envelopment of HCMV and showed a novel FIP4 function independent of Arf5 or Arf6 activity.
- University of Alabama at Birmingham United States
Cytoplasm, Cytomegalovirus, Membrane Proteins, Fibroblasts, Endoplasmic Reticulum, Transfection, Virus Replication, Polymerase Chain Reaction, Cell Line, Protein Transport, Viral Envelope Proteins, Two-Hybrid System Techniques, Chlorocebus aethiops, Animals, Humans, Electrophoresis, Polyacrylamide Gel, Carrier Proteins, Fluorescence Recovery After Photobleaching, Protein Binding
Cytoplasm, Cytomegalovirus, Membrane Proteins, Fibroblasts, Endoplasmic Reticulum, Transfection, Virus Replication, Polymerase Chain Reaction, Cell Line, Protein Transport, Viral Envelope Proteins, Two-Hybrid System Techniques, Chlorocebus aethiops, Animals, Humans, Electrophoresis, Polyacrylamide Gel, Carrier Proteins, Fluorescence Recovery After Photobleaching, Protein Binding
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