Scientists Map Proteins That Repair Cell Membranes
Scientists Map Proteins That Repair Cell Membranes
Publish Date: 2026-03-10 12:15:00
Source Domain: www.technologynetworks.com
In the evolutionary history of life, the ability of a cell to separate its inner world from the external environment was an important turning point. The so-called plasma membrane lets cells control what gets in and out and allows them to communicate and cooperate with one another, creating the conditions for complex, multicellular life.
This barrier is fragile. Every day, mechanical stress, environmental changes, and bacterial toxins threaten to puncture the membrane, and if the wounds aren’t sealed and healed quickly, the cell dies. Despite its importance to the survival of our cells, the processes of plasma membrane repair have remained elusive. Their relevance is underscored by the fact that mutations in plasma membrane repair proteins cause various diseases, likely arising from cell death due to unrepaired plasma membrane.
But now, researchers at the Okinawa Institute of Science and Technology (OIST) have captured this repair mechanism in new detail. Using budding yeast as a model organism, they identified 80 proteins involved in plasma membrane repair, 72 of them never reported before, and tracked their movements in real time. Their findings are published in eLife. “This is the first large-scale catalog of plasma membrane repair proteins, and a timeline of how the process unfolds,” says lead author Dr. Yuta Yamazaki of the Membranology Unit at OIST.
The team combined proteome-wide screening with advanced live-cell imaging. First, they scanned thousands of yeast proteins under normal and plasma membrane stress conditions. Then, they used laser-induced damage to puncture single cells and tracked protein movements over time.
From this, they discovered a coordinated sequence of molecular events. The first responders were proteins from the Pkc1 signaling pathway. Next came exocytosis, a process where vesicles inside the cell fuse with the plasma membrane to deliver fresh lipids and structural components, essential building blocks for sealing…
