Comparison of the pseudorabies virus Us9 protein with homologs from other veterinary and human alphaherpesviruses.
Pseudorabies virus (PRV) Us9 is a small, tail-anchored (TA) membrane protein that is essential for axonal sorting of viral structural proteins and is highly conserved among other members of the alphaherpesvirus subfamily. We cloned the Us9 homologs from two human pathogens, varicella-zoster virus (VZV) and herpes simplex virus type 1 (HSV-1), as well as two veterinary pathogens, equine herpesvirus type 1 (EHV-1) and bovine herpesvirus type 1 (BHV-1), and fused them to enhanced green fluorescent protein to examine their subcellular localization and membrane topology. Akin to PRV Us9, all of the Us9 homologs localized to the trans-Golgi network and had a type II membrane topology (typical of TA proteins). Furthermore, we examined whether any of the Us9 homologs could compensate for the loss of PRV Us9 in anterograde, neuron-to-cell spread of infection in a compartmented chamber system. EHV-1 and BHV-1 Us9 were able to fully compensate for the loss of PRV Us9, whereas VZV and HSV-1 Us9 proteins were unable to functionally replace PRV Us9 when they were expressed in a PRV background.
Department of Molecular Biology, 314 Schultz Laboratory, Princeton, NJ 08544, USA.
M G
MG
Lyman
C D
CD
Kemp
M P
MP
Taylor
L W
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Enquist
D018138:Alphaherpesvirinae / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D000595:Amino Acid Sequence; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000821:virology*; D002460:Cell Line; D002478:Cells, Cultured; D006566:Herpesviridae Infections / Q000378:metabolism / Q000662:veterinary* / Q000821:virology*; D006734:Horse Diseases / Q000821:virology*; D006736:Horses; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D008074:Lipoproteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D009474:Neurons / Q000378:metabolism / Q000821:virology; D010750:Phosphoproteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D021381:Protein Transport; D051381:Rats; D017207:Rats, Sprague-Dawley; D016415:Sequence Alignment; D014764:Viral Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D021601:trans-Golgi Network / Q000378:metabolism / Q000821:virology
D047908:Intracellular Signaling Peptides and Proteins; D008074:Lipoproteins; D010750:Phosphoproteins; C491630:US9 protein, Suid herpesvirus 1; D014764:Viral Proteins