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Journal Article

Structure and properties of the esterase from non-LTR retrotransposons suggest a role for lipids in retrotransposition


Vollmer,  B
Antonin Group, Friedrich Miescher Laboratory, Max Planck Society;

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Schneider, A., Schmidt, S., Jonas, S., Vollmer, B., Khazina, E., & Weichenrieder, O. (2013). Structure and properties of the esterase from non-LTR retrotransposons suggest a role for lipids in retrotransposition. Nucleic Acids Research (London), 41(22), 10563-10572. doi:10.1093/nar/gkt786.

Cite as: https://hdl.handle.net/21.11116/0000-000A-6758-0
Non-LTR retrotransposons are mobile genetic elements and play a major role in eukaryotic genome evolution and disease. Similar to retroviruses they encode a reverse transcriptase, but their genomic integration mechanism is fundamentally different, and they lack homologs of the retroviral nucleocapsid-forming protein Gag. Instead, their first open reading frames encode distinct multi-domain proteins (ORF1ps) presumed to package the retrotransposon-encoded RNA into ribonucleoprotein particles (RNPs). The mechanistic roles of ORF1ps are poorly understood, particularly of ORF1ps that appear to harbor an enzymatic function in the form of an SGNH-type lipolytic acetylesterase. We determined the crystal structures of the coiled coil and esterase domains of the ORF1p from the Danio rerio ZfL2-1 element. We demonstrate a dimerization of the coiled coil and a hydrolytic activity of the esterase. Furthermore, the esterase binds negatively charged phospholipids and liposomes, but not oligo-(A) RNA. Unexpectedly, the esterase can split into two dynamic half-domains, suited to engulf long fatty acid substrates extending from the active site. These properties indicate a role for lipids and membranes in non-LTR retrotransposition. We speculate that Gag-like membrane targeting properties of ORF1ps could play a role in RNP assembly and in membrane-dependent transport or localization processes.