RESEARCH: MEMBRANE TRANSPORT
FOLDING PROJECT #19226 PROFILE

This project studies how tiny proteins called transporters move stuff across cell membranes. Two similar transporters, NarU and NarK, carry the same stuff but use different methods. By comparing them, scientists hope to learn more about how these important proteins work.

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

A United Picture of Transporter Functions
Membrane transporters are an integral part of the cell and serve many roles across their involvement in the transport of ions, nutrients, neurotransmitters, and many drugs across cellular membranes.

There are three major classes of membrane transport proteins that facilitate the transport of various solutes.

These classes are Uniporters, which transport one solute across the membrane in one direction, Symporters, which transport two solutes across the membrane in the same direction, and Antiporters, which transfer two solutes in opposite directions across the membrane.

These classes follow different mechanisms of transport to move their solute(s) across the membrane.
Simulations for this project will be primarily focused on studying how structural differences, sequence level differences, and energetic level differences account for the difference in transport mechanisms across the two bacterial nitrate/nitrite membrane transporters NarU and NarK.

These transporters have high sequence similarity and similar solutes, yet differ in mechanism of transport.

By evaluating the differences in mechanism of transport arising in similar transporters of different classes, we hope to further improve our understanding of the controlling mechanisms behind membrane transport.

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Transporter

A protein that moves molecules across a cell membrane.

Transporters are essential proteins embedded in cell membranes. They facilitate the movement of various substances like ions, nutrients, and drugs into and out of cells. This process is crucial for maintaining cellular functions, signaling, and homeostasis.

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Membrane

A thin layer that surrounds a cell and separates its interior from the environment.

Membranes are fundamental components of cells, acting as barriers and regulating the passage of substances in and out. They are composed of lipids and proteins arranged in a bilayer structure, allowing for selective permeability.

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Uniporter

A type of membrane transporter that moves one solute across the membrane.

Uniporters are specialized transporters that facilitate the movement of a single molecule or ion across the cell membrane. They play a crucial role in maintaining cellular gradients and transporting essential nutrients.

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Symporter

A type of membrane transporter that moves two solutes across the membrane in the same direction.

Symporters are transporters that couple the movement of two molecules or ions across the membrane. This co-transport mechanism is essential for nutrient uptake and signal transduction.

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Antiporter

A type of membrane transporter that moves two solutes across the membrane in opposite directions.

Antiporters are transporters that facilitate the exchange of molecules or ions across the membrane. This counter-transport mechanism is crucial for maintaining ion balance and removing waste products.

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NarU

Nitrate/nitrite membrane transporter U in bacteria

NarU is a bacterial membrane protein involved in the transport of nitrate and nitrite. It plays a crucial role in nitrogen metabolism within bacteria.

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NarK

Nitrate/nitrite membrane transporter K in bacteria

NarK is another bacterial membrane protein involved in the transport of nitrate and nitrite. It shares similarities with NarU but differs in its transport mechanism.