Notes on Genus: Turncurtovirus

twinned icosahedra

Type member: Turnip curly top 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 single member most closely resembles members of the genus Curtovirus but it is phylogenetically distinct and the genome encodes 6 rather than 7 proteins.

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 2970 nucleotides long.

Genus Genomic Organization

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

Type Member Genomic Organization

ORF	sense	product
V1	+	32 kDa	Coat protein
V2	+	15 kDa	Movement protein
C1	-	42 kDa	Replication initiator protein
C2	-	16 kDa	Transciption activator protein (TrAP)
C3	-	17 kDa	Replication enhancer protein
C4	-	10 kDa	Symptom determinant