Orthotospovirus (taxid:2560196)

VIRION

image

c

Enveloped, spherical. Diameter from 80 to 120nm.

GENOME

image

Segmented Negative-stranded RNA linear genome, L segment is about 8.8kb, M segment about 4.8kb and S segment about 3kb.
Encodes for six proteins.

GENE EXPRESSION

Transcription starts by viral RNA dependent RNA polymerase (L) binding to a promoter on each encapsidated segment, and is terminated by a strong hairpin sequence at the end of each gene. mRNAs are capped by L protein during synthesis using cap snatching , but are not polyadenylated.
S and M segments uses ambisense strategy to encode forsevral proteins: both genomic ans antigenomic RNA are transcribed. The hairpin sequence is a stop polymerase signal which prevents ambisense transcription from producing dsRNA. MRNA1 encodes for a polyprotein which is cleaved by host protease into Gn and Gc proteins.

ENZYMES

REPLICATION

IN PLANT:CYTOPLASMIC

  1. Virus penetrates into the cell by effraction or plasmodesmata transport.
  2. Cytoplasmic transcription by viral polymerase on the RNA viral RNA template.
  3. Replication presumably starts when enough nucleoprotein is present to encapsidate neo-synthetized antigenomes and genomes.
  4. The ribonucleocapsid can penetrate in neighboring plant cells through plasmodesmata transport
  5. Alternatively budding of particles occurs at the cell membrane, releasing new virions.

IN INSECT:CYTOPLASMIC

  1. Attachment of the viral G glycoproteins to host receptors.
  2. Fusion of virus membrane with the vesicle membrane; ribonucleocapsid is released into the cytoplasm.
  3. Cytoplasmic transcription by viral polymerase on the RNA viral RNA template.
  4. Replication presumably starts when enough nucleoprotein is present to encapsidate neo-synthetized antigenomes and genomes.
  5. Budding of particles occurs at the cell membrane, releasing new virions.

Host-virus interaction

Inhibition of host innate immunity

TSWV NSs inhibits Dicer-mediated dsRNA processing thereby inhibiting RNAi-mediated immunity to control innate immune signaling.

Matching UniProtKB/Swiss-Prot entries

(all links/actions below point to uniprot.org website)

18 entries grouped by protein

5 entries

Envelopment polyprotein (M polyprotein)

Select_allDeselect_all
GP_TSWV1
Tomato spotted wilt virus (strain Brazilian Br-01) (TSWV) reference strain
GP_INSV
Impatiens necrotic spot virus (INSV)
GP_TSWV
Tomato spotted wilt virus (TSWV)
GP_TSWVD
Tomato spotted wilt virus (isolate D) (TSWV)
GP_TSWVR
Tomato spotted wilt virus (strain Regular2A) (TSWV)

1 entry

RNA-directed RNA polymerase L (Protein L) (EC 2.7.7.48) (Large structural protein) (Replicase) (Transcriptase)

L_TSWV1
Tomato spotted wilt virus (strain Brazilian Br-01) (TSWV) reference strain

2 entries

Movement protein (MVP) (Non-structural movement protein) (NSm)

Select_allDeselect_all
MVP_TSWV1
Tomato spotted wilt virus (strain Brazilian Br-01) (TSWV) reference strain
MVP_INSV
Impatiens necrotic spot virus (INSV)

7 entries

Nucleoprotein (Nucleocapsid protein) (Protein N)

Select_allDeselect_all
NCAP_TSWV1
Tomato spotted wilt virus (strain Brazilian Br-01) (TSWV) reference strain
NCAP_INSV
Impatiens necrotic spot virus (INSV)
NCAP_INSVN
Impatiens necrotic spot virus (strain NL-07) (INSV)
NCAP_TSWV3
Tomato spotted wilt virus (strain Brazilian Br-03) (TSWV) (Tomato chlorotic spot virus)
NCAP_TSWVH
Tomato spotted wilt virus (strain Hawaiian) (TSWV)
NCAP_TSWVL
Tomato spotted wilt virus (strain Bulgarian L3) (TSWV)
NCAP_TSWVS
Tomato spotted wilt virus (strain SA-05) (TSWV) (Groundnut ringspot virus)

3 entries

Non-structural protein NS-S

Select_allDeselect_all
NSS_TSWV1
Tomato spotted wilt virus (strain Brazilian Br-01) (TSWV) reference strain
NSS_INSVN
Impatiens necrotic spot virus (strain NL-07) (INSV)
NSS_TSWVL
Tomato spotted wilt virus (strain Bulgarian L3) (TSWV)