RESEARCH: INFLUENZA
FOLDING PROJECT #12454 PROFILE

Miniprotein drugs are being developed to fight flu by blocking a viral protein called hemagglutinin. Scientists want to understand how these miniproteins work so they can design even better ones. They'll use computer simulations to see how the miniproteins bind and unbind from hemagglutinin, giving us a clearer picture of the process.

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 with therapeutic potential.

Miniproteins are tiny proteins designed for specific medical purposes. They're smaller than traditional antibodies but still effective at targeting diseases. Researchers are exploring their use in treating infections and other conditions.

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monoclonal antibody

A laboratory-produced antibody that recognizes a specific antigen.

Monoclonal antibodies are lab-made immune system proteins that target specific molecules (antigens) on cells. They're used to treat various diseases by blocking harmful signals or triggering an immune response against cancer cells.

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infectious disease

A disease caused by a pathogen.

Infectious diseases are illnesses caused by microorganisms like bacteria, viruses, fungi, or parasites. They can spread from person to person or through contaminated environments.

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hemagglutinin

A viral protein that allows viruses to attach to host cells.

Hemagglutinin is a key protein found on the surface of many viruses. It helps the virus latch onto and enter human cells, enabling infection.

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H1 influenza A

Influenza A subtype H1.

H1N1 is a type of influenza virus that can cause seasonal flu. It's characterized by its hemagglutinin protein (H1) and neuraminidase protein (N1). Vaccinations are available to help prevent infection.

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sialic acid

A type of sugar found on cell surfaces.

Sialic acid is a common sugar molecule found attached to the surface of many cells. It plays a role in various biological processes, including cell signaling and recognition.

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post-endocytosis mechanism

The process that occurs after a cell has engulfed a particle.

Post-endocytosis refers to the events that happen inside a cell after it has taken in a substance through endocytosis. This can include breaking down the engulfed material or using it for other cellular functions.

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affinity maturation

The process of improving the binding strength of an antibody.

Affinity maturation is a natural process by which the immune system refines antibodies to make them bind more strongly to their target antigens. This enhances the effectiveness of the immune response.

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molecular dynamics simulations

Computer models that simulate the movement of molecules over time.

Molecular dynamics simulations use computer algorithms to track the interactions between atoms and molecules. This allows scientists to study how proteins fold, how drugs bind to targets, and other biological processes at the atomic level.

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enhanced sampling methods

Techniques used to speed up molecular dynamics simulations.

Enhanced sampling methods are designed to overcome the limitations of standard molecular dynamics simulations by exploring a wider range of possible conformations. This helps researchers study rare events and more complex systems.