Equine lysozyme: the molecular basis of folding, self-assembly and innate amyloid toxicity.

This research explores the structure and folding properties of Equine Lysozyme (EL), a type of protein present in horses. It shows this protein’s ability to self-assemble into unique structures and its potential toxicity, and emphasizes the need for strategies to control this potentially dangerous process.

About Equine Lysozyme

• Equine lysozyme is a type of protein found in horses.
• This research focuses on its unique structural and folding properties.
• Notably, it has characteristics that connect it to two sets of proteins usually studied separately: c-type lysozymes and alpha-lactalbumins.

Understanding Protein Folding

• Details about the native state and partially folded states of Equine Lysozyme provide valuable insights about protein folding.
• This is extremely important because protein folding, the process by which a protein structure takes its functional shape or conformation, is fundamental to understanding biological functions and diseases.

Molecular Characteristics of Equine Lysozyme

• When it comes to lysozymes, Equine Lysozyme forms one of the most stable molten globules—intermediate forms that proteins assume while folding—and exhibits uncooperative refolding kinetics, meaning it doesn’t easily return to its original shape once unfolded.
• Under certain conditions, specifically the presence of calcium, this protein can self-assemble into unique structures known as ring-shaped and linear amyloids.

Innate Amyloid Cytotoxicity

• Amyloid formation, the molecular process by which proteins fold into a shape allowing them to stick together and form rigid fibres, is usually associated with certain type of diseases such as Alzheimer’s.
• When this process happens in cases where it shouldn’t, the amyloids formed can be toxic.
• This research highlights the innate amyloid cytotoxicity, or natural cell-damaging effect, of lysozymes such as Equine Lysozyme.
• Due to this potential harm, the researchers emphasize the crucial need for effective ways to prevent such toxicity.