Abstract
The unconventional myosin 16 (Myo16), which may have a role in regulation of cell cycle and cell proliferation, can be found in both the nucleus and the cytoplasm. It has a unique, eight ankyrin repeat containing pre-motor domain, the so-called ankyrin domain (My16Ank). Ankyrin repeats are present in several other proteins, e.g., in the regulatory subunit (MYPT1) of the myosin phosphatase holoenzyme, which binds to the protein phosphatase-1 catalytic subunit (PP1c). My16Ank shows sequence similarity to MYPT1. In this work, the interactions of recombinant and isolated My16Ank were examined in vitro. To test the effects of My16Ank on myosin motor function, we used skeletal muscle myosin or nonmuscle myosin 2B. The results showed that My16Ank bound to skeletal muscle myosin (K D ≈ 2.4 µM) and the actin-activated ATPase activity of heavy meromyosin (HMM) was increased in the presence of My16Ank, suggesting that the ankyrin domain can modulate myosin motor activity. My16Ank showed no direct interaction with either globular or filamentous actin. We found, using a surface plasmon resonance-based binding technique, that My16Ank bound to PP1cα (K D ≈ 540 nM) and also to PP1cδ (K D ≈ 600 nM) and decreased its phosphatase activity towards the phosphorylated myosin regulatory light chain. Our results suggest that one function of the ankyrin domain is probably to regulate the function of Myo16. It may influence the motor activity, and in complex with the PP1c isoforms, it can play an important role in the targeted dephosphorylation of certain, as yet unidentified, intracellular proteins.
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Abbreviations
- GSH:
-
Glutathione
- GST:
-
Glutathione S-transferase
- HMM:
-
Heavy meromyosin
- MLC20:
-
Myosin regulatory light chain
- MLCK:
-
Myosin light chain kinase
- My16Ank:
-
Myosin 16 ankyrin domain
- Myo16:
-
Myosin 16
- MyPhoNE:
-
Myosin phosphatase N-terminal element
- MYPT1:
-
Myosin phosphatase regulatory subunit 1
- sk:
-
Skeletal
- skMyo2:
-
Full-length skeletal myosin
- NM2B:
-
Nonmuscle myosin 2B
- PP1c:
-
Protein phosphatase-1 catalytic subunit
- TEV:
-
Tobacco etch virus
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Acknowledgments
This work was supported by grants from the Hungarian Scientific Research Fund (OTKA grants NN 107776 and K112794 to M.N. and K109249 to F.E.) and by the “TÁMOP 4.2.4. A/2-11-1-2012-0001 National Excellence Program” supported by the European Union and the State of Hungary, co-financed by the European Social Fund to Z.K. and B.B. The authors thank Attila Nagy for preparing and providing NMIIB HMM.
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The authors declare that they have no conflicts of interest.
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Kengyel, A., Bécsi, B., Kónya, Z. et al. Ankyrin domain of myosin 16 influences motor function and decreases protein phosphatase catalytic activity. Eur Biophys J 44, 207–218 (2015). https://doi.org/10.1007/s00249-015-1015-z
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DOI: https://doi.org/10.1007/s00249-015-1015-z