In This Issue
People & Ideas
The stoichiometry of kinetochore components is determined, suggesting conservation between multiple microtubule-binding vertebrate and single microtubule-binding yeast kinetochores.
Microtubules with long polyglutamylated C-terminal tails are more prone to severing by spastin, establishing the importance of tubulin posttranslational modifications.
Role of kinase-independent and -dependent functions of FAK in endothelial cell survival and barrier function during embryonic development
Vascular development in mice only requires kinase-independent functions of FAK until E13.5, but kinase activity is needed for embryogenesis to complete.
Chromatin spatial organization helps establish the replication timing decision point at early G1. However, at G2, although retained, chromatin organization is no longer necessary or sufficient to maintain the replication timing program.
A robust cell cycle control mechanism limits E2F-induced proliferation of terminally differentiated cells in vivo
Overexpression of both CycE and E2F is necessary to trigger cell cycle reentry and overproliferation of terminally differentiated wing cells.
An RNAi screen determines that the early secretory pathway is subject to phosphoregulation via a variety of signaling pathways, including a link between growth factor signaling and ER export.
Kinesin-2 motor KIF17 autoinhibition is visualized in vivo; in the absence of cargo, this homodimer’s C-terminal tail blocks microtubule binding, and a coiled-coil segment blocks motility.
Exocytosis of acid sphingomyelinase by wounded cells promotes endocytosis and plasma membrane repair
Lysosomal enzyme acid sphingomyelinase is released extracellularly when cells are wounded, converting sphingomyelin to ceramide and inducing endosome formation to internalize membrane lesions.