Notes on Genus: Zeavirus

icosahedra

Type member: Maize necrotic 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 the genera in the family Tombusviridae. All the genera are morphologically similar, with icosahedral particles and small, (usually) monopartite ss RNA genomes. The genome organization resembles that of members of the genus Tombusvirus but the genome of 4.1kb is smaller and the coat protein is also smaller and lacks the protuding domain (thus resembling necroviruses).

Morphology

Virions isometric (icosahedral), 28nm in diameter. 32 capsomeres per nucleocapsid.

Genome

Monopartite, linear, single stranded positive sense RNA about 4100 nucleotides long. 3' terminus has no poly(A) tract.

Genus Genomic Organization

The RNA is translated into five putative products, including a polymerase, a 27kDa coat protein translated from the larger of two subgenomic RNAs and two other products translated from the smaller subgenomic.

Type Member Genomic Organization

The RNA is translated into five putative products:

1.	30 kDa	Replication protein
2.	89 kDa	Polymerase readthrough
3.	27 kDa	Coat protein, translated from subgenomic RNA1 (1607 nt)
4.	21 kDa	Movement protein, translated from subgenomic RNA2 (781 nt)
5.	19 kDa	silencing supressor, translated from subgenomic RNA2