title: Expression of coxsackievirus and adenovirus receptor (CAR)-Fc fusion protein in Pichia pastoris and characterization of its anti-coxsackievirus activity.
abstract: Coxsackievirus and adenovirus receptors (CARs) are the common cellular receptors which mediate coxsackievirus or adenovirus infection. Receptor trap therapy, which uses soluble viral receptors to block the attachment and internalization of virus, has been developed for the inhibition of virus infection. In this study, we have constructed a pPIC3.5K/CAR-Fc expression plasmid for the economical and scale-up production of CAR-Fc fusion protein in Pichia pastoris. The coding sequence of the fusion protein was optimized according to the host codon usage bias. The amount of the CAR-Fc protein to total cell protein was up to 10% by 1% methanol induction for 96h and the purity was up to 96% after protein purification. Next, the virus pull-down assay demonstrated the binding activity of the CAR-Fc to coxsackievirus. The analyses of MTT assay, immunofluorescence staining and quantitative real-time PCR after virus neutralization assay revealed that CAR-Fc could significantly block coxsackievirus B3 infection in vitro. In coxsackievirus B3 infected mouse models, CAR-Fc treatment reduced mortality, myocardial edema, viral loads and inflammation, suggesting the significant virus blocking effect in vivo. Our results indicated that the P. pastoris expression system could be used to produce large quantities of bioactive CAR-Fc for further clinical purpose.
authors: Center of Medical Experiment & Technology, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China.
authors: Kebin
authors: K
authors: Zhang
authors: Hua
authors: H
authors: Yu
authors: Wei
authors: W
authors: Xie
authors: Zihui
authors: Z
authors: Xu
authors: Shiwen
authors: S
authors: Zhou
authors: Chunji
authors: C
authors: Huang
authors: Halei
authors: H
authors: Sheng
authors: Xiaomei
authors: X
authors: He
authors: Junzhi
authors: J
authors: Xiong
authors: Guisheng
authors: G
authors: Qian
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D000998:Antiviral Agents / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology*; D003062:Codon; D062727:Coxsackie and Adenovirus Receptor-Like Membrane Protein / Q000096:biosynthesis* / Q000235:genetics; D003384:Coxsackievirus Infections / Q000188:drug therapy / Q000821:virology; D004591:Electrophoresis, Polyacrylamide Gel; D029822:Enterovirus B, Human / Q000187:drug effects*; D006331:Heart Diseases / Q000473:pathology / Q000821:virology; D007141:Immunoglobulin Fc Fragments / Q000096:biosynthesis* / Q000235:genetics; D051379:Mice; D008807:Mice, Inbred BALB C; D009206:Myocardium / Q000737:chemistry / Q000473:pathology; D009500:Neutralization Tests; D010843:Pichia / Q000235:genetics* / Q000378:metabolism; D015202:Protein Engineering; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis* / Q000235:genetics; D014779:Virus Replication / Q000187:drug effects
chemical_list: D000998:Antiviral Agents; D003062:Codon; D062727:Coxsackie and Adenovirus Receptor-Like Membrane Protein; D007141:Immunoglobulin Fc Fragments; D011993:Recombinant Fusion Proteins