Issues
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Cover image
Cover Image
Cover: STED nanoscopy of a chick spinal neuron growth cone, showing the invasion of microtubules (gold) into filopodia, which are rich in F-actin (cyan). Microtubule entry and capture within filopodia is necessary for filopodial stability and the chemotactic responses of the growth cone. Microtubules are guided along F-actin bundles and captured in filopodia by the actin-microtubule crosslinking activity of the formin Fmn2, which is associated with neurodevelopmental disorders. See article by T. Kundu, P. Dutta et al. (jcs252916).
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RESEARCH HIGHLIGHTS
STICKY WICKET
FIRST PERSON
CELL SCIENCE AT A GLANCE
TRP channels in health and disease at a glance
Summary: TRP channels are molecular sensors for a wide spectrum of cellular stimuli and environmental cues. Here, we describe how they integrate this information into physiological and pathological responses.
REVIEWS
Protein phosphatase 2A – structure, function and role in neurodevelopmental disorders
Summary: Mutations in PP2A subunits are associated with neurodevelopmental diseases. Here, we provide an overview of biochemical and functional implications of the de novo mutations reported on PP2A subunits.
The evolution of autophagy proteins – diversification in eukaryotes and potential ancestors in prokaryotes
Summary: Autophagy is conserved in most eukaryotes but not in prokaryotes; this Review summarizes the evolution of autophagy proteins within eukaryotes, and for some of them, even from prokaryotes.
RESEARCH ARTICLES
Super-resolution microscopy reveals the arrangement of inner membrane protein complexes in mammalian mitochondria
Highlighted Article: Super-resolution microscopy and density-based cluster analysis illuminate the arrangement of mitochondrial inner membrane proteins, providing insight into the cellular context of these proteins.
Embryonic stem cells are devoid of macropinocytosis, a trafficking pathway for activin A in differentiated cells
Summary: Activin A is internalised and signals through clathrin-mediated endocytosis and macropinocytosis in differentiated endothelial cells, while in pluripotent stem cells macropinocytosis is not active.
Substratum stiffness tunes membrane voltage in mammary epithelial cells
Summary: Analyses of cells cultured on synthetic substrata revealed that substratum stiffness signals through CFTR and Ca2+ channels to regulate membrane voltage in mammary epithelial cells.
Deletion of TRPV3 and CaV3.2 T-type channels in mice undermines fertility and Ca2+ homeostasis in oocytes and eggs
Summary: Electrophysiology and Ca2+-imaging studies revealed that Ca2+ influx via TRPV3, CaV3.2 and TRPM7 ion channels supports the filling of the Ca2+ stores in mouse oocytes and eggs.
Precise regulation of presenilin expression is required for sea urchin early development
Summary: Mutations of genes encoding presenilin lead to familial forms of Alzheimer's disease. We propose the sea urchin embryo as a model to study the expression of presenilin
The role of Mfn2 in the structure and function of endoplasmic reticulum-mitochondrial tethering in vivo
Summary:In vivo evidence demonstrating that Mfn2 acts as an endoplasmic reticulum-mitochondria tethering protein and regulates close contacts related to Ca2+ transfer in neuronal cells.
Maintenance of complex I and its supercomplexes by NDUF-11 is essential for mitochondrial structure, function and health
Summary: Destabilisation of complex I and its supercomplexes by removal of the assembly factor NDUF-11 severely affects balanced respiration, mitochondrial morphology and, ultimately, whole animal physiology.
Spc1 regulates the signal peptidase-mediated processing of membrane proteins
Summary: Spc1 protects membrane proteins from being cleaved by signal peptidase, implicating a role in substrate sorting for signal peptidase.
SUMO proteases SENP3 and SENP5 spatiotemporally regulate the kinase activity of Aurora A
Summary: SENP3 and SENP5 deSUMOylate Aurora A to suppress its hyperactivity on the spindle at metaphase. The SENP3/5-AurA axis regulates chromosome segregation to maintain genomic stability.
Coupling of dynamic microtubules to F-actin by Fmn2 regulates chemotaxis of neuronal growth cones
Highlighted Article: The precision and adaptability of cytoskeletal functions requires coupled activities of cytoskeletal subsystems. Fmn2 is a co-regulator of actin–microtubule dynamics necessary for neuronal chemotaxis.
Sequences in the stalk domain regulate auto-inhibition and ciliary tip localization of the immotile kinesin-4 KIF7
Highlighted Article: KIF7 is regulated by auto-inhibition, and human disease-associated mutations cause uniform binding along cytosolic microtubules and/or increased primary cilium localization.
An optogenetic model reveals cell shape regulation through FAK and fascin
Highlighted Article: Fascin and focal adhesion kinase work in conjunction to regulate cell morphology during shape-altering processes such as furrow formation by controlling height and adhesion area, respectively.
DNA polymerase η is a substrate for calpain: a possible mechanism for pol η retention in UV-induced replication foci
Summary: Calpain cleaves the translesion DNA polymerase η and potentially prevents its premature removal from chromatin after UV irradiation, pointing to a role for calpain in DNA damage response.
TOOLS AND RESOURCES
An optogenetic method for interrogating YAP1 and TAZ nuclear–cytoplasmic shuttling
Summary: We report a new method for quantification of nuclear import–export rates based on optogenetic reversible release of mitochondria-tethered proteins and validate the method using the transcription factors YAP1 and TAZ.
PUBLISHER'S NOTE
CORRECTION
Call for papers: Cell Biology of Mitochondria
We are welcoming submissions for our upcoming special issue: Cell Biology of Mitochondria. This issue will be coordinated by two Guest Editors: Ana J. Garcia-Saez (University of Cologne, Germany) and Heidi McBride (McGill University, Canada). Submission deadline: 1 October 2024.
Focal adhesion kinase signalling – tumour vulnerabilities and clinical opportunities
In this Review, David Schlaepfer and colleagues summarise 30 years of focal adhesion kinase (FAK) research with a view of the ongoing clinical testing of small-molecule FAK inhibitors. The authors touch on how FAK plays an important signal integration role and ultimately functions to guide cellular behaviour. Additionally, the authors discuss how FAK inhibition might present a powerful tool to influence the physiological response to other therapeutic approaches.
JCS-FocalPlane Training Grants
Early-career researchers - working in an area covered by JCS - who would like to attend a microscopy training course, please apply. Deadline dates for 2024 applications: 7 September (decision by week commencing 8 October 2024); 22 November (decision by week commencing 16 December).
Biologists @ 100 - join us in Liverpool in March 2025
We are excited to invite you to a unique scientific conference, celebrating the 100-year anniversary of The Company of Biologists, and bringing together our different communities. The conference will incorporate the Spring Meetings of the BSCB and the BSDB, the JEB Symposium Sensory Perception in a Changing World and a DMM programme on antimicrobial resistance. Find out more and register your interest to join us in March 2025 in Liverpool, UK.
Interview with Journal of Cell Science Editor Rob Parton
Read our interview with Rob Parton, a Cell Scientist to Watch, about his career journey leading him from the UK to the University of Queensland in Brisbane, Australia, the evolution of the membrane trafficking field and his advice for running a highly collaborative lab. As a Journal of Cell Science Editor, Rob brings to the journal his expertise in multiscale analysis of membrane function, membrane microdomains, lipid droplets and advanced microscopy techniques in cell biology.