Hydrophilic protein associated with desiccation tolerance exhibits broad protein stabilization function

Area of Science:

• Biochemistry
• Molecular Biology
• Cell Biology

Background:

• Desiccation tolerance is crucial for survival in harsh environments.
• Hydrophilic proteins, like late embryogenesis abundant (LEA) proteins, are abundant in desiccation-tolerant organisms.
• The precise function of LEA proteins in preventing cellular damage during dehydration remains unclear.

Purpose of the Study:

• To investigate the molecular mechanisms underlying desiccation tolerance.
• To determine the function of a group 3 LEA protein from the nematode Aphelenchus avenae.
• To assess the anti-aggregation and protective capabilities of LEA proteins.

Main Methods:

• In vitro protein aggregation assays.
• Co-expression of nematode LEA protein in human cell lines.
• Assessment of cell survival under dehydration conditions.

Main Results:

• A nematode LEA protein effectively prevents aggregation of various proteins during dehydration and rehydration.
• The LEA protein reduces aggregation of disease-associated proteins (polyglutamine and polyalanine expansions) in human cells.
• Human cells expressing LEA protein show increased survival rates when subjected to dehydration stress.

Conclusions:

• Group 3 LEA proteins function as potent anti-aggregants, protecting cellular proteomes from desiccation-induced damage.
• LEA proteins stabilize proteins, offering broad protection against water stress in both in vitro and in vivo models.
• This study highlights the potential of LEA proteins for applications in preserving biological materials and treating protein aggregation diseases.