Journal
GENES & DEVELOPMENT
Volume 31, Issue 9, Pages 939-952Publisher
COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT
DOI: 10.1101/gad.297051.117
Keywords
DEAD-box RNA helicase Vasa; Oskar; TDRD5; TDRD7; germ plasm; nuage
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Funding
- European Molecular Biology Laboratory
- EMBL Interdisciplinary Postdoc Program (EIPOD) under Marie Curie COFUND (Cofunding of Regional, National, and International Programmes) actions
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DEAD-box RNA helicases play important roles in a wide range of metabolic processes. Regulatory proteins can stimulate or block the activity of DEAD-box helicases. Here, we show that LOTUS (Limkain, Oskar, and Tudor containing proteins 5 and 7) domains present in the germline proteins Oskar, TDRD5 (Tudor domain-containing 5), and TDRD7 bind and stimulate the germline-specific DEAD-box RNA helicase Vasa. Our crystal structure of the LOTUS domain of Oskar in complex with the C-terminal RecA-like domain of Vasa reveals that the LOTUS domain occupies a surface on a DEAD-box helicase not implicated previously in the regulation of the enzyme's activity. We show that, in vivo, the localization of Drosophila Vasa to the nuage and germ plasm depends on its interaction with LOTUS domain proteins. The binding and stimulation of Vasa DEAD-box helicases by LOTUS domains are widely conserved.
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