Staufen-1 interacts with the human endogenous retrovirus family HERV-K(HML-2) rec and gag proteins and increases virion production. 2013

Kirsten Hanke, and Oliver Hohn, and Linda Liedgens, and Katharina Fiddeke, and Jula Wamara, and Reinhard Kurth, and Norbert Bannert
Division for HIV and Other Retroviruses, Robert Koch Institute, Berlin, Germany.

The human endogenous retrovirus family HERV-K(HML-2) Rec protein is an RNA transport factor that enhances nuclear export of intron-containing retroviral transcripts. Using the yeast two-hybrid approach, we have newly identified human Staufen-1 as a Rec-interacting protein. The interaction was confirmed by coimmunoprecipitation experiments, and the relevant site in Staufen-1 has been mapped to double-stranded RNA binding domain 4 (RBD4). Staufen-1 is in several aspects functionally related to retroviral RNA transport proteins. It binds mRNAs and targets its ribonuclear cargo to polysomes for efficient translation. We observed an accumulation of Staufen-1 in the nucleus of Rec-expressing cells and colocalization in the nucleoli as well as in the cytoplasm. Overexpression of Staufen-1 resulted in a 5-fold enhancement in nuclear export and/or translation of unspliced HERV-K(HML-2) viral RNAs in the presence of Rec and its Rec-responsive element (RcRE) binding site together with a clear increase in virus production. Staufen-1 was previously shown to interact with the Gag protein of HIV-1, promoting Gag oligomerization and RNA encapsidation. We demonstrate here that Staufen-1 also binds to the Gag protein of HERV-K(HML-2). Under stress conditions, Rec colocalizes with Staufen-1 in stress granules in cells that express viral RNA but not in mRNA-decay-related processing bodies. Our results suggest a new role for Staufen-1 as a cellular Rec and HERV-K(HML-2) Gag cofactor.

UI MeSH Term Description Entries
D002460 Cell Line Established cell cultures that have the potential to propagate indefinitely. Cell Lines,Line, Cell,Lines, Cell
D003598 Cytoskeletal Proteins Major constituent of the cytoskeleton found in the cytoplasm of eukaryotic cells. They form a flexible framework for the cell, provide attachment points for organelles and formed bodies, and make communication between parts of the cell possible. Proteins, Cytoskeletal
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D001665 Binding Sites The parts of a macromolecule that directly participate in its specific combination with another molecule. Combining Site,Binding Site,Combining Sites,Site, Binding,Site, Combining,Sites, Binding,Sites, Combining
D014759 Viral Envelope Proteins Integral membrane proteins that are incorporated into the VIRAL ENVELOPE. They are glycosylated during VIRAL ASSEMBLY. Envelope Proteins, Viral,Viral Envelope Glycoproteins,Viral Envelope Protein,Virus Envelope Protein,Virus Peplomer Proteins,Bovine Leukemia Virus Glycoprotein gp51,Hepatitis Virus (MHV) Glycoprotein E2,LaCrosse Virus Envelope Glycoprotein G1,Simian Sarcoma Virus Glycoprotein 70,Viral Envelope Glycoprotein gPr90 (Murine Leukemia Virus),Viral Envelope Glycoprotein gp55 (Friend Virus),Viral Envelope Proteins E1,Viral Envelope Proteins E2,Viral Envelope Proteins gp52,Viral Envelope Proteins gp70,Virus Envelope Proteins,Envelope Glycoproteins, Viral,Envelope Protein, Viral,Envelope Protein, Virus,Envelope Proteins, Virus,Glycoproteins, Viral Envelope,Peplomer Proteins, Virus,Protein, Viral Envelope,Protein, Virus Envelope,Proteins, Viral Envelope,Proteins, Virus Envelope,Proteins, Virus Peplomer
D014779 Virus Replication The process of intracellular viral multiplication, consisting of the synthesis of PROTEINS; NUCLEIC ACIDS; and sometimes LIPIDS, and their assembly into a new infectious particle. Viral Replication,Replication, Viral,Replication, Virus,Replications, Viral,Replications, Virus,Viral Replications,Virus Replications
D015683 Gene Products, gag Proteins coded by the retroviral gag gene. The products are usually synthesized as protein precursors or POLYPROTEINS, which are then cleaved by viral proteases to yield the final products. Many of the final products are associated with the nucleoprotein core of the virion. gag is short for group-specific antigen. Viral gag Proteins,gag Antigen,gag Gene Product,gag Gene Products,gag Polyproteins,gag Protein,gag Viral Proteins,Gene Product, gag,Retroviral Antigen gag Protein,gag Antigens,gag Gene Related Protein,gag Polyprotein,Antigen, gag,Antigens, gag,Polyprotein, gag,Polyproteins, gag,Protein, gag,Proteins, Viral gag,Proteins, gag Viral,Viral Proteins, gag,gag Proteins, Viral
D016601 RNA-Binding Proteins Proteins that bind to RNA molecules. Included here are RIBONUCLEOPROTEINS and other proteins whose function is to bind specifically to RNA. Double-Stranded RNA-Binding Protein,Double-Stranded RNA-Binding Proteins,ds RNA-Binding Protein,RNA-Binding Protein,ds RNA-Binding Proteins,Double Stranded RNA Binding Protein,Double Stranded RNA Binding Proteins,Protein, Double-Stranded RNA-Binding,Protein, ds RNA-Binding,RNA Binding Protein,RNA Binding Proteins,RNA-Binding Protein, Double-Stranded,RNA-Binding Protein, ds,RNA-Binding Proteins, Double-Stranded,ds RNA Binding Protein
D020077 Endogenous Retroviruses Retroviruses that have integrated into the germline (PROVIRUSES) that have lost infectious capability but retained the capability to transpose. ERV,ERVs,Endogenous Retrovirus,HERV,HERVs,Human Endogenous Retrovirus,Human Endogenous Retroviruses,Retroviruses, Endogenous,Endogenous Retrovirus, Human,Endogenous Retroviruses, Human,Retrovirus, Endogenous,Retrovirus, Human Endogenous,Retroviruses, Human Endogenous
D020798 Two-Hybrid System Techniques Screening techniques first developed in yeast to identify genes encoding interacting proteins. Variations are used to evaluate interplay between proteins and other molecules. Two-hybrid techniques refer to analysis for protein-protein interactions, one-hybrid for DNA-protein interactions, three-hybrid interactions for RNA-protein interactions or ligand-based interactions. Reverse n-hybrid techniques refer to analysis for mutations or other small molecules that dissociate known interactions. One-Hybrid System Techniques,Reverse One-Hybrid System Techniques,Reverse Two-Hybrid System Techniques,Three-Hybrid System Techniques,Yeast Two-Hybrid Assay,Yeast Two-Hybrid System Techniques,One-Hybrid System Technics,Reverse Three-Hybrid System Techniques,Three-Hybrid System Technics,Tri-Hybrid System Techniques,Two-Hybrid Assay,Two-Hybrid Method,Two-Hybrid System Technics,Yeast One-Hybrid System Techniques,Yeast Three-Hybrid Assay,Yeast Three-Hybrid System,Yeast Three-Hybrid System Techniques,Yeast Two-Hybrid System,n-Hybrid System Techniques,Assay, Two-Hybrid,Assay, Yeast Three-Hybrid,Assay, Yeast Two-Hybrid,Assays, Two-Hybrid,Assays, Yeast Three-Hybrid,Assays, Yeast Two-Hybrid,Method, Two-Hybrid,Methods, Two-Hybrid,One Hybrid System Technics,One Hybrid System Techniques,One-Hybrid System Technic,One-Hybrid System Technique,Reverse One Hybrid System Techniques,Reverse Three Hybrid System Techniques,Reverse Two Hybrid System Techniques,System Technique, n-Hybrid,System Techniques, n-Hybrid,System, Yeast Three-Hybrid,System, Yeast Two-Hybrid,Systems, Yeast Three-Hybrid,Systems, Yeast Two-Hybrid,Technic, One-Hybrid System,Technic, Three-Hybrid System,Technic, Two-Hybrid System,Technics, One-Hybrid System,Technics, Three-Hybrid System,Technics, Two-Hybrid System,Technique, One-Hybrid System,Technique, Three-Hybrid System,Technique, Tri-Hybrid System,Technique, Two-Hybrid System,Technique, n-Hybrid System,Techniques, One-Hybrid System,Techniques, Three-Hybrid System,Techniques, Tri-Hybrid System,Techniques, Two-Hybrid System,Techniques, n-Hybrid System,Three Hybrid System Technics,Three Hybrid System Techniques,Three-Hybrid Assay, Yeast,Three-Hybrid Assays, Yeast,Three-Hybrid System Technic,Three-Hybrid System Technique,Three-Hybrid System, Yeast,Three-Hybrid Systems, Yeast,Tri Hybrid System Techniques,Tri-Hybrid System Technique,Two Hybrid Assay,Two Hybrid Method,Two Hybrid System Technics,Two Hybrid System Techniques,Two-Hybrid Assay, Yeast,Two-Hybrid Assays,Two-Hybrid Assays, Yeast,Two-Hybrid Methods,Two-Hybrid System Technic,Two-Hybrid System Technique,Two-Hybrid System, Yeast,Two-Hybrid Systems, Yeast,Yeast One Hybrid System Techniques,Yeast Three Hybrid Assay,Yeast Three Hybrid System,Yeast Three Hybrid System Techniques,Yeast Three-Hybrid Assays,Yeast Three-Hybrid Systems,Yeast Two Hybrid Assay,Yeast Two Hybrid System,Yeast Two Hybrid System Techniques,Yeast Two-Hybrid Assays,Yeast Two-Hybrid Systems,n Hybrid System Techniques,n-Hybrid System Technique

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