RESEARCH: CANCER
FOLDING PROJECT #15312 PROFILE

This project relates to graspetides - tiny, powerful proteins with unique ring structures. Scientists will use computer simulations to figure out how these rings form and why different types of graspetides have different ring patterns. This could lead to new medicines based on these amazing molecules.

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 model species from multiple graspetide groups using atomic-level molecular dynamics (MD) simulations.

By comparing folding trajectories across these representative systems, we aim to identify conserved and group-specific determinants of ring pattern formation, and to assess whether distinct biosynthetic groups exhibit preferences for particular ring closure orders.

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Graspetides

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

Graspetides are a type of antimicrobial peptide produced by bacteria. They have a unique structure with rings formed through chemical reactions. These rings give them stability and allow them to fight against viruses, bacteria, and even enzymes. Researchers are studying how the specific sequence of amino acids in graspetides determines the formation of these rings.

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RiPPs

Ribosomally synthesized and post-translationally modified peptides

RiPPs are a diverse group of small proteins produced by bacteria. They are made on ribosomes like regular proteins but then undergo further chemical modifications after synthesis. These modifications give them unique properties and functions, such as fighting infections or regulating cellular processes.

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ATP-grasp ligase

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

ATP-grasp ligases are specialized enzymes that play a crucial role in building the unique rings found in graspetides. They use energy from ATP (a cellular energy source) to join specific parts of a peptide chain together, forming stable rings. This process is essential for giving graspetides their antimicrobial properties.

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Macrolactam

A cyclic structure formed by a peptide bond between the carboxyl group of one amino acid and the amine group of another amino acid.

Macrolactam is a type of ring structure commonly found in peptides. It's formed when the end of a peptide chain connects back to itself through a specific chemical bond. This creates a stable loop, contributing to the overall stability and function of the peptide.

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Macrolactone

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

Macrolactone is another type of ring structure often found in peptides. It's similar to macrolactam but uses a different type of chemical bond – an ester bond – to connect parts of the peptide chain. This creates a stable loop, contributing to the peptide's overall stability and function.

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Molecular dynamics (MD)

A computer simulation method used to study the movement and interactions of atoms and molecules over time.

Molecular dynamics (MD) is a powerful tool for understanding how molecules behave. It involves simulating the movements of atoms and molecules in a system over time. This allows researchers to study how proteins fold, how drugs interact with their targets, and other complex biological processes.