The Taspase1/Myosin1f-axis regulates filopodia dynamics

iScience

Paul Stahl¹  Nina Schulze²  Lena König²  Rutuja Patwardhan²  Lisa Moews²  Astrid Hensel²  Alexander Höing³  Roland H. Stauber³  Shirley K. Knauer⁴  Perihan Nalbant⁵ 

[1] Corresponding author;Department of Molecular Biology II, Center of Medical Biotechnology (ZMB), University Duisburg-Essen, 45141 Essen, Germany;Department of Molecular Cell Biology, Center of Medical Biotechnology (ZMB), University Duisburg-Essen, 45141 Essen, Germany;Department of Molecular and Cellular Oncology/ENT, University Mainz Medical Center, 55131 Mainz, Germany;Imaging Center Campus Essen (ICCE), Center of Medical Biotechnology (ZMB), University Duisburg-Essen, 45141 Essen, Germany;

关键词: Biological sciences;    Cell biology;    Immunology;   

DOI  :  

来源: DOAJ

【 摘 要 】

Summary: The unique threonine protease Tasp1 impacts not only ordered development and cell proliferation but also pathologies. However, its substrates and the underlying molecular mechanisms remain poorly understood. We demonstrate that the unconventional Myo1f is a Tasp1 substrate and unravel the physiological relevance of this proteolysis. We classify Myo1f as a nucleo-cytoplasmic shuttle protein, allowing its unhindered processing by nuclear Tasp1 and an association with chromatin. Moreover, we show that Myo1f induces filopodia resulting in increased cellular adhesion and migration. Importantly, filopodia formation was antagonized by Tasp1-mediated proteolysis, supported by an inverse correlation between Myo1f concentration and Tasp1 expression level. The Tasp1/Myo1f-axis might be relevant in human hematopoiesis as reduced Tasp1 expression coincided with increased Myo1f concentrations and filopodia in macrophages compared to monocytes and vice versa. In sum, we discovered Tasp1-mediated proteolysis of Myo1f as a mechanism to fine-tune filopodia formation, inter alia relevant for cells of the immune system.

【 授权许可】

Unknown