Petuvirus

The genus Petuvirus belongs to the family Caulimoviridae and is classified under group VII DNA Reverse Transcribing Viruses.

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Petuviruses are plant viruses. Their genome is unsegmented and monopartite (meaning all genes are found within one segment of nucleic acid) containing a double-stranded DNA molecule that forms an open circle. Its genome is 7200 nucleotides long and has a guanine + cytosine content of 38.2%. There are terminally redundant sequences on the genome which have direct terminal repeats that are reiterated internally in inverted form. The virus codes for 2 ORF(s).

The viral capsid is unenveloped. Its capsid shells are multilayered. The capsid is round to elongate with icosahedral symmetry and the virus is composed of 16% nucleic acid. Petuviruses have a buoyant density in CsCl of 1.31 g cm-3 and there are 1 sedimenting component(s) found in purified preparations. The sedimentation coefficient is 218–251.5–285 S20w while the thermal inactivation point (TIP) is at 55–57.5–60°C.

Putuviruses (including other members of the Caulimovirusus such as soymoviruses and Cavemoviruses) form isometric particles whereas members of Badnaviruses and Tungroviruses have bacilliform virus particles. Lipids are not reported.

References

• MicrobiologyBytes.com
• DPVWeb.net
• AseanBiotechnology.info