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Structural analysis and immunogenicity of recombinant major envelope protein (rA27L) of buffalopox virus, a zoonotic Indian vaccinia-like virus

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Title Structural analysis and immunogenicity of recombinant major envelope protein (rA27L) of buffalopox virus, a zoonotic Indian vaccinia-like virus
 
Creator Kumar A, Yogisharadhya R, Bhanuprakash V, Venkatesan G, Shivachandra SB.
 
Subject Buffalopox virus; Immunogenicity; Indirect-ELISA; Mouse model; Oligomers; Recombinant A27L protein; Structural analysis.
 
Description Buffalopox virus (BPXV), an Indian variant of vaccinia virus (VACV), is a zoonotic agent and affects buffaloes, cattle and humans. A27L is one of the conserved major immuno-dominant envelope proteins of orthopox viruses (OPVs) involved in viral entry/maturation and elicits neutralizing antibodies. In this study, the A27L gene of BPXV-Vij/96 strain encoding recombinant mature A27L (21S to E110) and C-terminal truncated A27L-LZD (21S to N84aa) proteins were cloned and over-expressed in Escherichia coli as fusion proteins. Structurally, A27L of BPXV was similar to that of VACV and found to contain four regions including a potential coiled-coil motif (CCM) in the centre (43 to 84aa). Oligomerization of recombinant A27L fusion protein (∼30 kDa) leads to the formation of dimer/trimers/tetramers under non-reducing conditions. Further, the purified rA27L protein was used for active immunization of rabbit (250 μg/rabbit) and adult mice (10 μg and 50 μg/mice) with or without adjuvants (FCA, alum and CpG). Immune response measured by using indirect-ELISA and SNT revealed a gradual increase in antigen specific serum IgG as well as neutralization antibody titers. Upon challenge with virulent BPXV strain, a protection of 60% was observed in suckling mice passively administered with anti-rA27L sera. No cross-reactivity of rA27L protein with hyperimmune sera against ORFV, GTPV, SPPV, PPRV, FMDV and BTV was noticed in indirect-ELISA. The study indicated that the rA27L protein is a safe and potential prophylactic as well as diagnostic antigen for buffalopox.
 
Date 2023-05-12T09:34:59Z
2023-05-12T09:34:59Z
2015-10-05
 
Type Research Paper
 
Identifier Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/77210
 
Language English
 
Publisher Elsevier