Processing and Translation Initiation of Non-long Terminal Repeat Retrotransposons by Hepatitis Delta Virus (HDV)-like Self-cleaving Ribozymes

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 2011 Oct 14

PMID 21994949

Citations 41

Authors

Dana J Ruminski

Chiu-Ho T Webb

Nathan J Riccitelli

Andrej Luptak

Affiliations

Soon will be listed here.

Abstract

Many non-long terminal repeat (non-LTR) retrotransposons lack internal promoters and are co-transcribed with their host genes. These transcripts need to be liberated before inserting into new loci. Using structure-based bioinformatics, we show that several classes of retrotransposons in phyla-spanning arthropods, nematodes, and chordates utilize self-cleaving ribozymes of the hepatitis delta virus (HDV) family for processing their 5' termini. Ribozyme-terminated retrotransposons include rDNA-specific R2, R4, and R6, telomere-specific SART, and Baggins and RTE. The self-scission of the R2 ribozyme is strongly modulated by the insertion site sequence in the rDNA, with the most common insertion sequences promoting faster processing. The ribozymes also promote translation initiation of downstream open reading frames in vitro and in vivo. In some organisms HDV-like and hammerhead ribozymes appear to be dedicated to processing long and short interspersed elements, respectively. HDV-like ribozymes serve several distinct functions in non-LTR retrotransposition, including 5' processing, translation initiation, and potentially trans-templating.

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