Notes on Genus: Becurtovirus

twinned icosahedra

Type member: Beet curly top Iran 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. Its members have biological properties resembling those of the genus Curtovirus but the genome organization with a spliced replication initiator protein resembles that of members of the genus Mastrevirus. 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 2850 nucleotides long.

Genus Genomic Organization

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

Type Member Genomic Organization

ORF	sense	product
V1	+	29 kDa	Coat protein
V2	+	14 kDa	ss/dsDNA regulator
V3	+	10 kDa	Movement protein
C1	-	35 kDa	Replication protein A
C2	-	12 kDa	Replication protein B