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Historical collection: Cell death

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Danielle M. Paul, Judith Mantell, Ufuk Borucu, Jennifer Coombs, Katherine J. Surridge, John M. Squire, Paul Verkade, Mark P. Dodding
Paul et al. use cryo-ET to show that microtubules can contain actin filaments in their lumen. Two types of F-actin structure are distinguished, Class I and Class II, with slightly different helical symmetries and outer microtubule diameters. They call these filaments microtubule lumenal actin (ML-actin).
Article
Nina Marie Pedersen, Eva Maria Wenzel, Ling Wang, Sandra Antoine, Philippe Chavrier, Harald Stenmark, Camilla Raiborg
Cancer cell dissemination is facilitated by small actin-rich plasma membrane protrusions called invadopodia. Pedersen et al. now show that invadopodia maturation and function depend on contact site formation between the endoplasmic reticulum and late endosomes, which promotes translocation of the latter to growing invadopodia.
Article
Natalia Pacheco-Fernandez, Mehrshad Pakdel, Birgit Blank, Ismael Sanchez-Gonzalez, Kathrin Weber, Mai Ly Tran, Tobias Karl-Heinz Hecht, Renate Gautsch, Gisela Beck, Franck Perez, Angelika Hausser, Stefan Linder, Julia von Blume
Trafficking of matrix metalloproteinases (MMPs) through the Golgi remains enigmatic in the field. Pacheco-Fernandez et al. find that nucleobindin-1 (NUCB1), a cis-Golgi localized Ca2+-binding protein, plays a major role in this process by binding to MMPs, regulating their intra-Golgi trafficking, and thereby modulating cell invasion and matrix degradation.
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Yui Tomioka, Tetsuya Kotani, Hiromi Kirisako, Yu Oikawa, Yayoi Kimura, Hisashi Hirano, Yoshinori Ohsumi, Hitoshi Nakatogawa
Autophagy selectively degrades a wide range of cellular components to regulate cellular functions or maintain cellular homeostasis. Tomioka et al. reveal that the nuclear pore complex and nucleoporins are degraded by selective autophagy upon inactivation of Tor kinase complex 1 in Saccharomyces cerevisiae.
Article
Dorotea Fracchiolla, Chunmei Chang, James H. Hurley, Sascha Martens
Autophagy requires the synthesis of PI(3)P and the conjugation of LC3 to the phagophore membrane. We reconstituted these two reactions and their coupling by WIPI2 and showed that positive feedback between PI3KC3-C1 and WIPI2 leads to rapid LC3 lipidation by the ATG16L1 complex.
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Marisa D. Ruehle, Alexander J. Stemm-Wolf, Chad G. Pearson
Sas4 is a conserved basal body assembly protein. Here, Ruehle et al. describe a previously unknown link between basal bodies and the control of cell division by Hippo signaling molecules that depends on Sas4.
Report
Alexandra F. Long, Pooja Suresh, Sophie Dumont
To segregate chromosomes, the mammalian spindle must generate and respond to force. How it does so remains poorly understood. Pulling on the spindle using microneedles, Long et al. show that it can locally dissipate sustained force by regulating microtubule dynamics and breakage, thereby preserving global spindle structure.

Related Articles from Rockefeller University Press

Current Issue
Volume 219,
Issue 6,
June 1, 2020
Reviews & Opinions
Spotlight
Levi Ali, Cole M. Haynes
Ali and Haynes preview recent work from Liu et al. that provides new insight into the connection between mitochondrial dynamics, mitochondrial translation, and organismal longevity.
Viewpoint | Reproducibility
Rob C.I. Wüst, Riekelt H. Houtkooper, Johan Auwerx
This Reproducibility Viewpoint discusses confounding factors of Tet-On/Tet-Off and Cre/loxP systems, including doxycycline-induced microbiome alterations, mitochondrial dysfunction, and tamoxifen-induced toxicity.
Spotlight
Joyce C.M. Meiring, Anna Akhmanova
Meiring and Akhmanova preview work from Kopf et al. that shows that microtubules act to prevent cell rupture during protrusion extension in dendritic cells via regulation of actomyosin contractility.

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