RESEARCH: MEMBRANE TRANSPORT
FOLDING PROJECT #17903 PROFILE

This project looks at how adding a phosphate group to the end of sugar transporter proteins affects how they work and clump together. Understanding this could help us learn about how cells adjust their sugar transport when their metabolism changes.

Measuring the Effects of Post-translational Modification on Membrane Transporter Function and Oligomerization: Membrane transporters possess terminal tails which can variably regulate their substrate recognition, gating dynamics, and oligomerization (see https://royalsocietypublishing.org/doi/full/10.1098/rsob.190083 for a review).

To reflect physiological conditions and satisfy the instantaneous demands of cells, these termini are known to be post-translationally modified (PTM).

PTMs, like phosphorylation, have been shown to regulate transporter function through allostery or direct local interactions, thus blocking transmembrane substrate import and/or export. Simulations in this project will be focused on studying how C-terminal phosphorylation affects oligomerization dynamics of a sugar transporter.

While a basic protein folding problem, understanding how PTMs affect transporter oligomerization, and oligomer dynamics, is critical for understanding biological regulations for basal transport activity.

This study's ability to observe how terminal PTMs may influence sugar transport dynamics has implications for studying cells in altered metabolic states.

Post-translational Modification

Chemical alterations to proteins after synthesis.

Post-translational modifications (PTMs) are chemical changes that happen to proteins after they've been made by the cell. These modifications can alter a protein's shape, function, and interactions with other molecules. PTMs play crucial roles in regulating many cellular processes, including signaling, metabolism, and gene expression.

Membrane Transporter

A protein embedded in cell membranes that facilitates the movement of substances across the membrane.

Membrane transporters are proteins found within the cell's outer membrane. They act like gatekeepers, controlling the movement of various molecules – nutrients, ions, and waste products – in and out of the cell. This selective transport is essential for maintaining cellular balance and function.

Oligomerization

The process of proteins forming multi-subunit complexes.

Oligomerization is when multiple protein molecules join together to create a larger, more complex structure. These protein clusters, called oligomers, can perform specialized functions that individual proteins couldn't achieve alone. Oligomerization plays a vital role in various cellular processes, including signaling, enzyme activity, and membrane transport.

Phosphorylation

The addition of a phosphate group to a molecule, often a protein.

Phosphorylation is a crucial chemical modification where a phosphate group (PO4) is added to a molecule, typically a protein. This process acts like a switch, turning cellular processes on or off. Enzymes called kinases catalyze phosphorylation, while phosphatases remove the phosphate groups. Phosphorylation plays a central role in regulating various cellular functions, including metabolism, cell growth, and signaling.

Allostery

The regulation of an enzyme's activity by binding of a molecule to a site other than the active site.

Allostery is a way that enzymes can be controlled. Imagine an enzyme as a machine with two parts: the active site where it does its work and another site called an allosteric site. When a molecule binds to the allosteric site, it changes the shape of the enzyme's active site, making it either more or less efficient at doing its job. This allows cells to finely tune enzyme activity based on their needs.