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

ORF	sense	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)