Membrane localization of a Myb3 transcription factor regulated by a TvCyP1 cyclophilin in the parasitic protozoan Trichomonas vaginalis

Membrane localization of a Myb3 transcription factor regulated by a TvCyP1 cyclophilin in the... In Trichomonas vaginalis, a TvCyP1 cyclophilin was previously demonstrated to regulate the nuclear translocation of Myb1 and Myb3, which respectively repress and activate transcription of an adhesion protein ap65‐1 gene. In the present study, TvCyP1 was found to bind to Myb3 at sites spanning 54Gly‐Pro55 and 72Gly‐Pro73 with differential affinities. When Gly54 and Gly72 in Myb3 were both mutated, the mutant protein was restrained on outer membranes of hydrogenosomes and some cytoplasmic vesicles. In the purified Myb3 protein complex, a high molecular weight Myb3‐interacting protein (Myb3IPhmw) and a 72‐kDa heat shock protein (TvHSP72) were identified and characterized, with direct binding of Myb3 to Myb3IPhmw and TvHSP72 confirmed in vitro. When cell lysates were fractionated by the differential and gradient centrifugations, TvCyP1 and Myb3 were always associated with membrane fractions enriched with Myb3IPhmw and Myb1, as well as hydrogenosomes and VMyb organelle fractions. Mutations of Gly54 and/or Gly72 resulted in membrane redistribution of Myb3 and the aberrant assembly of the Myb3 protein complex. Consistent with these findings, the involvement of TvCyP1 in membrane distribution of Myb3, and dissociation of Myb3 from TvCyP1 protein complex were demonstrated, with direct interactions between TvCyP1 and Myb3IPhmw and that between TvCyP1 and TvHSP72, confirmed in vitro. These observations suggest that TvCyP1 directly binds to Myb3 and some of its interacting proteins to mediate serial conformational switches of Myb3 for its transition from the membrane compartments toward the nucleus. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Febs Journal Wiley

Membrane localization of a Myb3 transcription factor regulated by a TvCyP1 cyclophilin in the parasitic protozoan Trichomonas vaginalis

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Publisher
Wiley
Copyright
Copyright © 2018 Federation of European Biochemical Societies
ISSN
1742-464X
eISSN
1742-4658
D.O.I.
10.1111/febs.14374
Publisher site
See Article on Publisher Site

Abstract

In Trichomonas vaginalis, a TvCyP1 cyclophilin was previously demonstrated to regulate the nuclear translocation of Myb1 and Myb3, which respectively repress and activate transcription of an adhesion protein ap65‐1 gene. In the present study, TvCyP1 was found to bind to Myb3 at sites spanning 54Gly‐Pro55 and 72Gly‐Pro73 with differential affinities. When Gly54 and Gly72 in Myb3 were both mutated, the mutant protein was restrained on outer membranes of hydrogenosomes and some cytoplasmic vesicles. In the purified Myb3 protein complex, a high molecular weight Myb3‐interacting protein (Myb3IPhmw) and a 72‐kDa heat shock protein (TvHSP72) were identified and characterized, with direct binding of Myb3 to Myb3IPhmw and TvHSP72 confirmed in vitro. When cell lysates were fractionated by the differential and gradient centrifugations, TvCyP1 and Myb3 were always associated with membrane fractions enriched with Myb3IPhmw and Myb1, as well as hydrogenosomes and VMyb organelle fractions. Mutations of Gly54 and/or Gly72 resulted in membrane redistribution of Myb3 and the aberrant assembly of the Myb3 protein complex. Consistent with these findings, the involvement of TvCyP1 in membrane distribution of Myb3, and dissociation of Myb3 from TvCyP1 protein complex were demonstrated, with direct interactions between TvCyP1 and Myb3IPhmw and that between TvCyP1 and TvHSP72, confirmed in vitro. These observations suggest that TvCyP1 directly binds to Myb3 and some of its interacting proteins to mediate serial conformational switches of Myb3 for its transition from the membrane compartments toward the nucleus.

Journal

Febs JournalWiley

Published: Jan 1, 2018

Keywords: ; ; ; ; ; ;

References

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