Notes on Genus: Microvirus

icosahedra
icosahedra

Type member: Enterobacteria phage fX174

Contents

General Description

This is one of the genera in the family Microviridae. Members infect delta-purple bacteria.

Morphology

Virions isometric (icosahedral), not enveloped, 26-32 nm in diameter with small surface projections.

Genome

Monopartite, positive sense, circular ssDNA 4.5-6 kb in length.

Genus Genomic Organization

About 10 ORFs are translated from closely spaced or overlapping genes.

Type Member Genomic Organization

There are 10 closely spaced or overlapping ORFs:
ORFkDa Function
A58.7Progeny ds replicative form synthesis; a shorter form A* (38.7 kDa) is translated from an alternative start codon
B13.8Procapsid morphogenesis
K6.4Unkown
C10.1Progeny ssDNA synthesis
D16.9Procapsid scaffold
E10.6Cell lysis
J4.2Packaging
F48.5Injection
G19.0Attachment
H34.4Spike protein