title: Site 1 protease is required for proteolytic processing of the glycoproteins of the South American hemorrhagic fever viruses Junin, Machupo, and Guanarito.
abstract: The cellular proprotein convertase site 1 protease (S1P) has been implicated in the proteolytic processing of the glycoproteins (GPs) of Old World arenaviruses. Here we report that S1P is also involved in the processing of the GPs of the genetically more-distant South American hemorrhagic fever viruses Guanarito, Machupo, and Junin. Efficient cleavage of Guanarito virus GP, whose protease recognition sites deviate from the reported S1P consensus sequence, indicates a broader specificity of S1P than anticipated. Lack of GP processing of Junin virus dramatically reduced production of infectious virus and prevented cell-to-cell propagation. Infection of S1P-deficient cells resulted in viral persistence over several weeks without the emergence of escape variants able to use other cellular proteases for GP processing.
authors.affiliation: Molecular and Integrative Neurosciences Department, The Scripps Research Institute, La Jolla, California 92037, USA.
authors.forename: Jillian M
authors.initials: JM
authors.lastname: Rojek
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Lee
authors.forename: NgocThao
authors.initials: N
authors.lastname: Nguyen
authors.forename: Christina F
authors.initials: CF
authors.lastname: Spiropoulou
authors.forename: Stefan
authors.initials: S
authors.lastname: Kunz
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D006477:Arenaviruses, New World / Q000378:metabolism*; D016466:CHO Cells; D002460:Cell Line; D002522:Chlorocebus aethiops; D006224:Cricetinae; D003412:Cricetulus; D006023:Glycoproteins / Q000378:metabolism*; D049452:Green Fluorescent Proteins / Q000378:metabolism; D006801:Humans; D007668:Kidney / Q000166:cytology; D008156:Luciferases / Q000032:analysis / Q000378:metabolism; D008969:Molecular Sequence Data; D009154:Mutation; D043484:Proprotein Convertases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D011498:Protein Precursors / Q000737:chemistry / Q000378:metabolism; D011499:Protein Processing, Post-Translational; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism; D012697:Serine Endopeptidases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D014162:Transfection; D014709:Vero Cells
chemical_list: D006023:Glycoproteins; D011498:Protein Precursors; D011994:Recombinant Proteins; D049452:Green Fluorescent Proteins; D008156:Luciferases; D043484:Proprotein Convertases; D012697:Serine Endopeptidases; C115575:membrane-bound transcription factor peptidase, site 1