Element:Tse3

From The Gypsy Database

Description

Tse3 is a LTR retrotransposon characterized in Saccharomyces exiguus (Neuveglise et al.2002). Tse3 belongs to the Chromoviridae branch, term suggested (Marín and Lloréns 2000) to describe the Ty3/Gypsy elements bearing chromodomain-integrases (Malik and Eickbush 1999). The chromovirus branch has been disclosed to be the most ancient phylogenetic pattern of Ty3/Gypsy retroelements (Gorinsek, Gubensek and Kordis 2004; 2005; Kordis 2005).

The genomic structure of Tse3 is 6.5 Kb in size, including LTRs of 947-948 nt. The internal region displays a Primer Binding Site (PBS), two Open Reading Frames (ORFs) the gag, and pol genes, and a Polypurine Tract (PPT) adjacent to the 3´LTR (Neuveglise et al.2002). Apparently, Tse3 does not bear chromodomain at the C-terminal end of its integrase domain. The PBS of fungi and vertebrate chromoviruses, differs significantly from that used by plant chromoviruses. While plant chromoviruses use a methionine starting tRNA (iMet), fungi and vertebrate chromoviruses use their own self-priming mechanism to start the reverse transcription (Levin 1995 ; Butler et al. 2001).

Structure

Tse3.png


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:AJ439555
Clade:Tse3
Cluster or genus:Undetermined
Branch or class:Chromoviruses
Family:Ty3/Gypsy
System:LTR retroelements
Host:
Explore the Tree Life Project
Saccharomyces exiguus.gif
Saccharomyces exiguus
Image, Joaquin Panadero,
Copyright, GyDB, Biotech Vana
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