Notes on Genus: Badnavirus

bacilliform

Type member: Commelina yellow mottle 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

This is one of 7 genera in the family Caulimoviridae, which are distinctive amongst plant viruses in having double-stranded DNA. Members of the badnavirus genus (bacilliform DNA viruses) are those with bacilliform, rather than isometric particles and with 3 open reading frames in the genome. They are also known as the Commelina yellow mottle virus group. Viruses previously classified in this genus but which have 4 open reading frames are now classified in the genus Tungrovirus.

Morphology

Virions bacilliform, not enveloped, about 30 nm in diameter and varying in length between 60-900 nm, depending upon the species.

Genome

Monopartite, open circular, double stranded DNA of 7000-7600 base pairs with a single-strand discontinuity at one site in each strand.

Genus Genomic Organization

The genome has direct terminal repeats, reiterated internally in inverted form and is translated from 3 open reading frames (ORFs) on the same DNA strand. The largest of the ORFs is probably a polyprotein, subsequently processed into several functional products.

Type Member Genomic Organization

There are 3 open reading frames on the same DNA strand:

ORF1, putative 23 kDa product
ORF2, putative 15 kDa product
ORF3, putative 216 kDa polyprotein, subsequently processed into several functional products.