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https://www.selleckchem.com/products/mizagliflozin.html ER tubules form and maintain membrane contact sites (MCSs) with endosomes. How and why these ER-endosome MCSs persist as endosomes traffic and mature is poorly understood. Here we find that a member of the reticulon protein family, Reticulon-3L (Rtn3L), enriches at ER-endosome MCSs as endosomes mature. We show that this localization is due to the long divergent N-terminal cytoplasmic domain of Rtn3L. We found that Rtn3L is recruited to ER-endosome MCSs by endosomal protein Rab9a, which marks a transition stage between early and late endosomes. Rab9a utilizes an FSV region to recruit Rtn3L via its six LC3-interacting region motifs. Consistent with our localization results, depletion or deletion of RTN3 from cells results in endosome maturation and cargo sorting defects, similar to RAB9A depletion. Together our data identify a tubular ER protein that promotes endosome maturation at ER MCSs.The control of gut homeostasis by autophagy in the context of host-microbiota relationship remains poorly understood. In this issue of Developmental Cell, Nagai et al. (2021) show that autophagy plays a crucial role in enterocytes to prevent the mis-regulation of the Hippo-Yorkie pathway by the microbiota.Carcinoma-associated fibroblast (CAF) infiltration confers poor clinical outcomes in colorectal cancer (CRC) through mechanisms that are still unclear. In this issue of Developmental Cell, Kasashima et al. report that loss of PKCζ engenders a SOX2/SFRP2-positive CAF subpopulation that increases CRC aggressiveness by creating an immunosuppressed environment.Retrotransposons provide both threats and evolutionary opportunities for their hosts. In this issue of Developmental Cell, Laureau et al. describe a fascinating host-retrotransposon relationship that may lead to retrotransposon domestication Ty3/Gypsy exploit meiosis networks to sustain their transcription, while the host deploys RNA-binding proteins to prevent their transla

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