RESEARCH: CANCER
FOLDING PROJECT #15321 PROFILE

Graspetides are special peptides with strong shapes that make them good at fighting germs and viruses. Scientists are using computer simulations to understand how these peptides fold and create their unique shapes, hoping to learn more about how they work.

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

Graspetides are a class of ribosomally synthesized and post-translationally modified peptides (RiPPs) characterized by the ATP-grasp ligase–catalyzed macrolactam or macrolactone linkages in their structure.

These macrocycles impart structural stability and diverse bioactivities, including antimicrobial, antiviral, and enzyme inhibitory effects.

Graspetides are classified into distinct groups based on sequence motifs, cyclization patterns, and biosynthetic machinery.

While each group exhibits characteristic ring topologies, the molecular basis by which core peptide sequence and folding pathways dictate the order of ring formation remains poorly understood. In this study, we will investigate the interactions between graspetide precursor peptides and their respective ATP-grasp ligases using atomic-level molecular dynamics (MD) simulations.

By comparing the folding trajectories of these systems under differing conditions, we aim to identify and assess patterns in ring closure preference.

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Graspetides

A class of ribosomally synthesized and post-translationally modified peptides (RiPPs).

Graspetides are a special type of peptide produced by bacteria. They have a unique ring structure that makes them very stable. This stability allows them to be used for various purposes, such as fighting infections or blocking the activity of enzymes.

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RiPPs

Ribosomally Synthesized and Post-translationally Modified Peptides

RiPPs are a category of peptides produced by ribosomes in bacteria. These peptides undergo modifications after they're made, giving them specific functions like fighting infections or regulating biological processes.

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ATP-grasp ligase

An enzyme that catalyzes the formation of macrolactam or macrolactone linkages in peptides.

ATP-grasp ligases are enzymes that play a crucial role in creating a specific type of ring structure in some peptides. This ring structure is important for the peptide's function and stability.

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Macrolactam

A type of cyclic peptide linkage formed by an amide bond between the carboxyl group of one amino acid and the amine group of another amino acid.

Macrolactam is a term used to describe a specific type of ring structure found in some peptides. It's formed when a part of a peptide chain connects back to itself through a special chemical bond.

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Macrolactone

A type of cyclic peptide linkage formed by an ester bond between the carboxyl group of one amino acid and the hydroxyl group of another amino acid.

Macrolactone is similar to macrolactam but uses a different type of chemical bond. Both terms describe ring structures found in some peptides, which are important for their function and stability.

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Molecular Dynamics (MD) Simulations

A computational method used to simulate the movement and interactions of atoms and molecules over time.

Molecular Dynamics Simulations are computer programs that allow scientists to study how molecules move and interact. This helps us understand how things work at a very small level.

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Folding Trajectories

The path a molecule takes as it changes shape and structure.

Folding trajectories describe how a molecule, like a protein, changes shape over time. This process is important because the shape of a molecule determines its function.