Topic: Biology

Researchers found a protein called PEX11 helps plant cells control the size of their peroxisomes during early growth. This discovery could help us understand human diseases and bioengineering.

Plants use photosynthesis to make energy, but when they're young, they can't capture light yet. Instead, they rely on stored fatty acids for energy. To break down these fatty acids, plant cells have a specialized structure called peroxisomes.

Peroxysomes are like tiny factories inside the cell that help with fatty acid processing. They're found in human cells too! Bonnie Bartel's team at Rice University studied these enlarged peroxisomes in young plants to understand how they work.

They focused on a protein called PEX11, which helps control the size of peroxisomes during early plant growth. In new research published in Nature Communications, the team found that PEX11 also helps regulate the expansion and shrinkage of peroxisomes.

To study this protein, Nathan Tharp used advanced CRISPR techniques to disable different combinations of genes responsible for making PEX11. By doing so, he was able to see how PEX11 affects peroxisome growth.

Tharp found that when PEX11 is involved, peroxisomes expand during the seed-to-seedling stage and then shrink back down once photosynthesis starts. But if PEX11 is missing or abnormal, peroxisomes can grow way too big! He also discovered that these giant peroxisomes lack small membrane-bound compartments called vesicles.

Tharp's findings extend beyond plants to other species. When he introduced the yeast version of PEX11 into mutant plant cells, it returned the peroxisomes to their normal size. This suggests that Pex11 serves a similar function in yeast and possibly even human cells.

Why It Matters

This discovery can help us understand how diseases like peroxisomal disorders affect humans. It also has implications for bioengineering and could lead to new ways of treating these conditions.

Key Facts

• Scientists discovered a protein called PEX11 helps plant cells control the size of their peroxisomes during early growth.
• PEX11 regulates the expansion and shrinkage of peroxisomes in young plants.
• When PEX11 is involved, peroxisomes expand during the seed-to-seedling stage and then shrink back down once photosynthesis starts.
• If PEX11 is missing or abnormal, peroxisomes can grow way too big!
• Tharp's findings extend beyond plants to other species, including yeast.

Key Terms

Peroxisome

A membrane-bound compartment found in plant and human cells that helps with fatty acid processing.

Implications

This discovery can help us understand how diseases like peroxisomal disorders affect humans. It also has implications for bioengineering and could lead to new ways of treating these conditions.