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Cowpea Mosaic Virus is a single stranded RNA virus of cowpea mosaic virus. The virus particles are icosahedral symmetric, 20-24 nm in diameter, and the genome consists of two RNA chains, M (3.8 kb) and B (6.6 kb). The coat protein contains 37 kDa and 22 kDa components. The typical strain is the SB strain, mainly distributed in Suriname, Cuba, the United States, Nigeria and other regions. The virus has a narrow host range and mainly infects leguminous plants such as cowpeas, causing flower and leaf deformities, chlorosis, leaf deformities, and plant dwarfism. The virus is transmitted through beetles, aphids, and sap, with a seed transmission probability of 1-5%. There are differences in serology and pathogenicity among different strains, with the SB strain being a typical yellowing strain and the virulent strain being separately named as cowpea severe mosaic virus. Prevention and control measures include seed screening, aphid control, and application of antiviral agents.
Figure 1. CPMV images. (Sainsbury, Frank, M, 2010)
CPMV adopts a unique multi protein expression strategy for both of its genomic RNAs. Each RNA contains an open reading frame that is translated into a large polyprotein precursor, which is then subjected to protein hydrolysis to produce mature functional proteins. The RNA-1 encoded 24K protease mediates the cleavage of two polymeric proteins, coordinating the production of functional viral proteins throughout the entire infection cycle. This efficient gene expression strategy enables the virus to rapidly produce the components required for host cell replication, movement, and particle assembly. Additionally, viral translation initiation relies on the interaction between the 5′-linked VPg (viral protein) and host eIF4E, making this VPg-eIF4E binding interface another key target to suppress polyprotein synthesis.
The host range is very narrow, and there are few other hosts outside leguminous plants. Almost all hosts show necrosis and chlorosis on the inoculated leaves There are significant differences in symptom response and severity among different varieties of cowpeas Immunity, disease resistance, and high susceptibility have all appeared. The symptoms on infected hosts can range from almost invisible chlorosis and mottled to obvious flower and leaf deformities, leading to weak growth.
| Diagnosis | Details |
| Diagnostic host | Vigna unguiculata (cowpea) cv. Blackeye Early Ramshorn, at the beginning of inoculation, there were diffuse chlorosis spots (1-3 mm in diameter) on the leaves, bright yellow leaves on the three small leaves, or gradually worsening bright flower and leaf symptoms on the new leaves The leaves are deformed and the growth size decreases, and there is no necrosis observed in this plant species. After inoculation with amaranth colored quinoa, the leaves showed yellowing and local withered spots (diameter 0.5-1 mm) that turned into necrotic spots; The systemic symptoms include severe flower and leaf discoloration, deformities, and blistering. |
| Breeding host | Vigna unguiculata (cowpea) cv. Blackeye Early Ramshorn is a good source of virus propagation and purification. |
| Determine Host | Pinto (Phaseolus vulgaris cv. Pinto) and Chenopodium amaranth (Chenopodium amaranth) are suitable drought tolerant hosts. For dry spot hosts, the Pinto cultivar of kidney beans is the preferred choice because the host cannot be systematically infected and the virus content is high in the diseased spot. |
| Strain | Chant suggested that beetle borne cowpea viruses from Trinidad and Nigeria may be related strains. Agrawal divided the five isolates into two strains and named them the yellowing strain and the virulent strain A Nigerian isolate and SB isolate from Suriname belong to the yellowing strain |
In addition to epitope display, CPMV is also designed to develop complex systems for expressing entire exogenous proteins in plants. These measures include:
Recent research has explored CPMV as a platform for cancer vaccine development. Research has shown that CPMV particles displaying NY-ESO-1 cancer testis antigen can effectively stimulate antigen-specific cytotoxic T cell responses. The 30nm icosahedral structure of CPMV promotes enhanced uptake and activation of antigen-presenting cells, resulting in strong CD8+T cell activation exhibiting antigen-specific proliferation and cancer cell toxicity. This biological nano material platform represents a promising method for developing NY-ESO-1 positive malignant tumor vaccine, including triple negative breast cancer, melanoma, myeloma and ovarian cancer
Cowpea mosaic virus is a fascinating pathogen with dual significance of agricultural threat and biotechnology assets. Its binary genome, efficient replication cycle, and well-defined molecular interactions make it a model system for studying plant virus biology. Key genes such as 1D RdRp, 1B Pro, and 2A/2B motor proteins are crucial for infection. Meanwhile, its stable capsid and carrier capabilities place CPMV at the forefront of plant-based biotechnology, enabling innovation in vaccine development and nanotechnology. With the intensification of climate change and global food demand, controlling CPMV and other plant viruses remains crucial for ensuring food security. The advancement of genome sequencing, gene editing, and vector technology has provided new pathways for the development of persistent resistance in cowpeas and other leguminous plants. By utilizing our understanding of CPMV biology, we can mitigate its impact on agriculture while utilizing its unique characteristics to promote advances in biotechnology.
Reference
| Target | Cat. No. | Product Name | Size | Application | |
| CPMV | DEIAPV93 | Blackeye cowpea mosaic virus (BlCMV) ELISA Kit | 500T/1000T/5000T | Qualitative | Inquiry |
| Target | Cat. No. | Product Name | Host | |
| CPMV | DAG-WT373 | Recombinant Cowpea Mosaic Virus (CPMV) VLP | Nicotiana benthamiana | Inquiry |
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