Notes on Genus: Eragrovirus

twinned icosahedra

Type member: Eragrostis curvularia streak 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 Geminiviridae. The single member is unusual in having a coat protein mostly closely related to members of the genus Mastrevirus but replication proteins that most nearly resemble members of the genus Begomovirus. There are only 4 ORFs and the origin of replication sequence is the unusual TAAGATTCC.

Morphology

Virions are geminate (twinned) icosahedra, not enveloped, 38 nm long and 22 nm in diameter. 22 capsomeres per nucleocapsid.

Genome

Monopartite, closed circular, single stranded DNA, about 2750 nucleotides long.

Genus Genomic Organization

There are two open reading frames (ORFs) in the positive (virion) sense and (probably) two in the negative (complementary) sense.

Type Member Genomic Organization

ORFsense product
V1+29 kDa Coat protein
V2+10 kDa Movement protein
C1-42 kDa Replication initiation protein
C2-18 kDa Posssible transciption activator protein (TrAP)