A new adaptor protein directs lipid traffic at cellular junctions
A study in the Journal of Cell Biology has identified a key regulatory mechanism for lipid transport at membrane contact sites. Researchers discovered that a conserved protein, named Hoi1, acts as a specific adaptor that targets bridge-like lipid transfer proteins (BLTP2-like proteins Fmp27/Hob1 and Hob2) to contact sites between the endoplasmic reticulum (ER) and the plasma membrane. The work shows that two distinct domains of Hoi1 interact with structural features on the BLTP2 protein, and disrupting this interaction perturbs cellular sterol homeostasis. This Hoi1-mediated targeting mechanism is evolutionarily conserved, with genetic evidence supporting a shared functional pathway in organisms from yeast to worms and flies.
Why it might matter to you: This research directly addresses a core question in cell biology: how cells spatially regulate the non-vesicular transport of lipids between organelles. For professionals focused on cell signaling, membrane trafficking, and organelle dynamics, the discovery of Hoi1 provides a new molecular handle for understanding lipid homeostasis. It opens avenues for investigating how dysregulation of this specific targeting mechanism might contribute to metabolic disorders or could be leveraged for therapeutic intervention.
Source →Stay curious. Stay informed — with Science Briefing.
Always double check the original article for accuracy.
