Notes on Genus: Capillovirus

flexuous filaments

Type member: Apple stem grooving virus

Contents

Members of this Genus
General Description
Morphology
Electron Micrograph
Genome
Genus Genomic Organization
Genome Map
Type Member Genomic Organization
All Known Sequences
Curated Sequences

General Description

The genus Capillovirus (from the Latin capillus = a hair) is one of the genera now included in the family Betaflexiviridae. It contains viruses originally placed as tentative members of the genus Closterovirus, but which have shorter virions, a very different genome organisation and a poly(A) tail.

Morphology

Virions filamentous, not enveloped, 640 nm long and 12 nm in diameter. Nucleocapsids have 'rope-like' and 'criss-cross' patterns when stained with uranyl acetate.

Virions composed of 5% nucleic acid.

Genome

Monopartite, linear, single stranded, positive sense RNA, 6500-7500 nucleotides long. 3' terminus has a poly(A) tract.

Genus Genomic Organization

The viral RNA is translated into a polyprotein (240-270 kDa), which is subsequently processed into functional products, with the coat protein at the C-terminus. A separate protease or movement protein may also be translated directly from a different reading frame.

Type Member Genomic Organization

RNA is c. 6500 nucleotides long and is believed to be translated into a large (241 kDa) polyprotein, which is subsequently processed into functional products. A separate 36 kDa protein translated in a different reading frame is believed to be a movement protein.