RESEARCH: INFLUENZA
FOLDING PROJECT #12426 PROFILE

This project looks at miniprotein drugs designed to fight flu. These proteins block a key part of the virus (hemagglutinin) from infecting cells. Scientists want to use computer simulations to understand how these miniproteins work so they can design even better ones in the future.

Note: This TLDR is a simplication and may not be 100% accurate.

Designed miniprotein therapeutics occupy the middle ground between small molecule drugs and monoclonal antibody treatments for infectious disease.

Hemagglutinin is a viral fusion protein that allows H1 influenza A (HA) to bind sialic acid on cell surfaces, as well as being involved in the post-endocytosis mechanism of cellular infection.; The Baker lab at University of Washington has developed de novo designed miniproteins that bind hemagglutinin, and developed ways to improve their binding through affinity maturation.

Many of the mutations seen in affinity-matured sequences are not directly in the binding interface, and it is unclear how these changes lead to higher affinity.

Understanding this mechanism may help us better computationally design better binders.

We aim to use molecular dynamics simulations to examine ab initio binding pathways for these miniprotein binders, and use enhanced sampling methods to study the unbinding reaction.

Pairing these methods together will provide a robust description of the complete binding reaction for this system.

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Miniprotein

A small protein engineered for a specific purpose.

Miniproteins are tiny, artificially created proteins with tailored functions. They're smaller than traditional antibodies and can be designed to target specific molecules in the body, making them promising tools for treating diseases.

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Monoclonal Antibody

A laboratory-produced antibody that can target specific cells or molecules in the body.

Monoclonal antibodies are lab-made versions of natural antibodies. They're designed to bind to very specific targets, like proteins on cancer cells or viruses. This targeted binding helps treat diseases by blocking harmful actions or flagging infected cells for destruction.

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Infectious Disease

A disease caused by a pathogen, such as a virus, bacterium, or fungus.

Infectious diseases are illnesses spread through contact with pathogens. These microscopic invaders can cause a wide range of symptoms and can be transmitted through various means like air, water, food, or direct contact.

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Hemagglutinin

A viral protein that allows viruses to bind to sialic acid on cell surfaces.

Hemagglutinin is a key protein found on the surface of many viruses, including influenza. It helps the virus attach to and enter cells by recognizing specific sugars called sialic acids present on cell membranes.

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Influenza A (HA)

A subtype of the influenza virus that causes seasonal flu.

Influenza A is a type of virus responsible for seasonal flu outbreaks. It's characterized by symptoms like fever, cough, muscle aches, and fatigue. HA stands for Hemagglutinin, a viral protein crucial for its ability to infect cells.

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Sialic Acid

A type of sugar molecule found on the surface of cells.

Sialic acid is a common sugar molecule attached to many proteins and lipids on cell surfaces. It plays important roles in cell signaling, immune recognition, and viral binding.

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Affinity Maturation

The process of improving the binding affinity of a protein to its target.

Affinity maturation is a technique used to enhance the strength with which a molecule, like an antibody or miniprotein, binds to its target. It involves introducing mutations and selecting for those that result in stronger binding.

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Molecular Dynamics Simulations

Computer simulations that model the movement of atoms and molecules over time.

Molecular dynamics simulations are powerful computer tools used to study how molecules interact and move. By simulating these interactions over time, scientists can gain insights into processes like protein folding, drug binding, and disease mechanisms.

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Enhanced Sampling Methods

Techniques used to accelerate the exploration of conformational space in molecular simulations.

Enhanced sampling methods are strategies employed in molecular simulations to overcome limitations in exploring all possible conformations of a molecule. They help researchers investigate rare events and uncover hidden details about molecular behavior.