Osvaldo is a putative fly-retrovirus characterized in Drosophila buzzatii that shows a high transposition rate in some strains of this organism, as well as in D. buzzatii and D. koepferae hybrids (Labrador and Fontdevila 1994;Pantazidis, Labrador and Fontdevila 1999). Osvaldo gives the name and belongs, along with other Ty3/Gypsy LTR retroelements, to Osvaldo clade (Malik and Eickbush 1999). The genomic structure of Osvaldo is 9.1 Kb size including LTRs of 1.2 Kb. The internal region of this retrovirus displays, adjacent to both the 3´ and 5´ LTRs, two Primer Binding Sites (PBS) complementary to a tRNALys, two Open Reading Frames (ORFs) for gag, and pol genes, and an env gene partially encoded in two ORFs interrupted by an intron (Pantazidis, Labrador and Fontdevila 1999). Osvaldo also displays, as other Ty3/Gypsy elements, a Polypurine Tract (PPT) adjacent to the 3′ LTR.



Figure not to scale. If present, long terminal repeats (LTRs) have been highlighted in blue. Amino acid motifs noted with lines indicate the conserved residues in each protein domain, abbreviations below mean:

MA=matrix PR=protease DU or DUT=dUTPase TM=transmembrane TAV or IBMP=transactivator/viroplasmin or inclusion body matrix protein
CA=capsid RT=reverse transcriptase INT=Integrase CHR=chromodomain
NC=nucleocapsid RH=RNaseH SU=surface MOV=movement protein
PPT=polypurine tract PBS=primer binding site ATF=aphid transmission factor VAP=virion associated protein

Related literature

Genbank accession: AJ133521
Clade: Osvaldo
Cluster or genus: Undetermined
Branch or class: Branch 2
Family: Ty3/Gypsy
System: LTR retroelements
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Image, courtesy of Andreas Trepte, Max-Planck Institute for Molecular Genetics
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Welcome to the Gypsy Database (GyDB) an open editable database about the evolutionary relationship of viruses, mobile genetic elements (MGEs) and the genomic repeats where we invite all authors to contribute with their knowledge to improve and expand the topics.
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Llorens, C., Futami, R., Covelli, L., Dominguez-Escriba, L., Viu, J.M., Tamarit, D., Aguilar-Rodriguez, J. Vicente-Ripolles, M., Fuster, G., Bernet, G.P., Maumus, F., Munoz-Pomer, A., Sempere, J.M., LaTorre, A., Moya, A. (2011) The Gypsy Database (GyDB) of Mobile Genetic Elements: Release 2.0 Nucleic Acids Research (NARESE) 39 (suppl 1): D70-D74 doi: 10.1093/nar/gkq1061

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