Particle Structure

Tollin, P.; Wilson, H. R.

doi:10.1007/978-1-4684-7038-3_3

Cited by 26 publications

(18 citation statements)

References 84 publications

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“…There are 8.9 subunits per turn of the helix in PVX virions (98,108,114). Depending on the genus, flexiviruses exhibit varying degrees of flexibility, with potexviruses and carlaviruses being the least flexuous.…”

Section: Virion Structurementioning

confidence: 99%

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FamilyFlexiviridae: A Case Study in Virion and Genome Plasticity

Martelli¹,

Adams

Kreuze

et al. 2007

Annu. Rev. Phytopathol.

320

196

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The plant virus family Flexiviridae includes the definitive genera Potexvirus, Mandarivirus, Allexivirus, Carlavirus, Foveavirus, Capillovirus, Vitivirus, Trichovirus, the putative genus Citrivirus, and some unassigned species. Its establishment was based on similarities in virion morphology, common features in genome type and organization, and strong phylogenetic relationships between replicational and structural proteins. In this review, we provide a brief account of the main biological and molecular properties of the members of the family, with special emphasis on the relationships within and among the genera. In phylogenetic analyses the potexvirus-like replicases were more closely related to tymoviruses than to carlaviruses. We postulate a common evolutionary ancestor for the family Tymoviridae and the two distinct evolutionary clusters of the Flexiviridae, i.e., a plant virus with a polyadenylated genome, filamentous virions, and a triple gene block of movement proteins. Subsequent recombination and gene loss would then have generated a very diverse group of plant and fungal viruses.

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Section: Virion Structurementioning

confidence: 99%

“…Cross-banding spacing corresponds to the pitch of the primary helix (12,114). Carlavirus and potexvirus particles are marked also by near-longitudinal lines along their length that correspond to rows of subunits lying on secondary helices (85,114).…”

Section: Virion Structurementioning

confidence: 99%

FamilyFlexiviridae: A Case Study in Virion and Genome Plasticity

Martelli¹,

Adams

Kreuze

et al. 2007

Annu. Rev. Phytopathol.

320

196

View full text Add to dashboard Cite

show abstract

“…Virions are helically constructed with a pitch of the primary helix in the range 3.4-3.8 nm and with approximately 10 protein subunits per turn (Tollin and Wilson, 1988). The very flexuous and open structure of the particles is the most conspicuous trait of members of the family, notwithstanding the morphological resemblance to flexuous filamentous particles of other plant viruses in the genera Trichovirus, Capillovirus, Vitivirus, Citrivirus and Foveavirus.…”

Section: Structure Of Virus Particlesmentioning

confidence: 99%

Closteroviridae

Martelli

Candresse²

2014

Encyclopedia of Life Sciences

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Closteroviridae is a family of plant viruses with filamentous, helically constructed particles showing distinct cross‐banding and varying in length from 650 nm (species with fragmented genome) to over 2000 nm (species with monopartite genome). The genome is a single‐stranded, positive‐sense ribonucleic acid , with size varying from 13 000 to nearly 19 000 nucleotides, thus being among the largest known for plant viruses. The family comprises four genera, Closterovirus , Ampelovirus , Crinivirus and Velarivirus , which differ in genome type (monopartite, bipartite or tripartite) and size, and in epidemiological behaviour. Closteroviruses are transmitted by aphids; ampeloviruses by pseudococcid mealybugs and soft scale insects and criniviruses by whiteflies. No vectors are known for velariviruses. These viruses are mostly phloem‐restricted. Except for velariviruses all are transmitted with a semipersistent modality regardless of the type of vector and are pathogenic to a wide range of herbaceous and woody crops, to which they may cause extensive damage. Control is based on preventive measures such as sanitary selection, sanitation and induction of resistance, primarily through conventional breeding. Key Concepts: Closteroviridae is a growing family of plant viruses with currently four genera. All members of the family have filamentous virions with open particle structures and distinct cross‐banding. Closteroviral genomes are among the largest for plant viruses and are highly diversified also within each genus. The family represents a monophyletic lineage that has evolved in a modular way. A characterising trait of three genera ( Closterovirus, Ampelovirus and Crinivirus ) is the type of vectors that mediate transmission from host to host. Virus particles are primarily restricted to the phloem from where they are acquired by the vectors. Virus dissemination over long distances is mediated by infected propagative material, rather than vectors. Most members of the family have a restricted natural host range. Disease control relies on preventive measures aimed at reducing vector populations and sources of inoculum. Sanitary selection and sanitation are efficient means for producing certified stocks.

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“…1 The PVX RNA contains five genes. 2 The 5 0 -proximal gene codes for the 165 kDa replicase, 3 the 3 0 -proximal coat protein (CP) gene is preceded by three partially overlapping genes termed the "triple gene block" (TGB).…”

Section: Introductionmentioning

confidence: 99%