Herpes Simplex Virus 1 Us3 Deletion Mutant is Infective Despite Impaired Capsid Translocation to the Cytoplasm

Viruses

Peter Wild²  Sabine Leisinger²  Anna Paula de Oliveira¹  Elisabeth M. Schraner²  Andres Kaech³  Mathias Ackermann¹  Kurt Tobler¹ 

[1] Institute of Virology, Winterthurerstrasse 266a, CH-8057 Zürich, Switzerland; E-Mails:;Institute of Veterinar Anatomy, Winterthurerstrasse 260, CH-8057 Zürich, Switzerland; E-Mails:;Center for Microscopy and Image Analysis, Winterthurerstrasse 190,CH-8057 Zürich, Switzerland; E-Mail:

关键词: HSV-1;    Us3 protein kinase;    envelopment;    morphogenesis;    electron microscopy;    morphometry;   

DOI  :  10.3390/v7010052

来源: mdpi

【 摘 要 】

Herpes simplex virus 1 (HSV-1) capsids are assembled in the nucleus bud at the inner nuclear membrane into the perinuclear space, acquiring envelope and tegument. In theory, these virions are de-enveloped by fusion of the envelope with the outer nuclear membrane and re-enveloped by Golgi membranes to become infective. Us3 enables the nucleus to cytoplasm capsid translocation. Nevertheless, Us3 is not essential for the production of infective progeny viruses. Determination of phenotype distribution by quantitative electron microscopy, and calculation per mean nuclear or cell volume revealed the following: (i) The number of R7041(∆U_S3) capsids budding at the inner nuclear membrane was significantly higher than that of wild type HSV-1; (ii) The mean number of R7041(∆U_S3) virions per mean cell volume was 2726, that of HSV-1 virions 1460 by 24 h post inoculation; (iii) 98% of R7041(∆U_S3) virions were in the perinuclear space; (iv) The number of R7041(∆U_S3) capsids in the cytoplasm, including those budding at Golgi membranes, was significantly reduced. Cell associated R7041(∆U_S3) yields were 2.37 × 10⁸ and HSV-1 yields 1.57 × 10⁸ PFU/mL by 24 h post inoculation. We thus conclude that R7041(∆U_S3) virions, which acquire envelope and tegument by budding at the inner nuclear membrane into the perinuclear space, are infective.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.