Related Experiment Video
Updated: Aug 29, 2025
07:21
Quantitative Microtubule Fractionation Technique to Separate Stable Microtubules, Labile Microtubules, and Free Tubulin in Mouse Tissues
Published on: November 17, 2023
2.1K
Rational Discovery of Microtubule-Stabilizing Peptides
Brandon Úsuga-Acevedo1, Yadiris García1, Carola F Díaz1
1Departamento de Ciencias Químicas, Facultad de Ciencias Exactas, Universidad Andres Bello, Sede Concepción, Autopista Concepción-Talcahuano 7100, Talcahuano, Chile 4300866.
Journal of Chemical Information and Modeling
|September 8, 2022
Summary
Researchers discovered new microtubule-stabilizing peptides for neurodegenerative diseases by combining computational modeling and experimental assays. Two lead compounds, P43 and P52, show promising safety and efficacy for future drug development.
Area of Science:
- Biochemistry
- Pharmacology
- Computational Biology
Background:
- Microtubule (MT) stabilization is a promising therapeutic strategy for neurodegenerative diseases.
- Identifying novel MT-stabilizing agents, particularly peptides, is of significant interest.
Purpose of the Study:
- To rationally discover and characterize novel MT-stabilizing octapeptides.
- To evaluate the potential of these peptides as therapeutic agents for neurodegenerative conditions.
Main Methods:
- Protein-peptide docking and molecular dynamics simulations (MD, GaMD) were employed to screen and refine peptide candidates.
- Tubulin polymerization assays were used to experimentally validate MT-stabilizing activity.
- Binding assays and cell viability studies assessed peptide-tubulin interaction and safety.
Main Results:
- Four octapeptides demonstrated in vitro MT-stabilizing activity.
- Two peptides, NWPVSIWQ (P43) and HAPVSIIQ (P52), exhibited the highest activity and bound to nonpolymeric tubulin.
- Viability assays confirmed the safety of P43 and P52 in HEK cells.
Conclusions:
- The study successfully identified novel MT-stabilizing peptides through a rational drug design approach.
- P43 and P52 represent promising lead compounds for developing new therapies against neurodegenerative diseases.
- The findings contribute to the rational design of future MT-stabilizing peptide therapeutics.
More Related Videos
Related Concept Videos
01:15Drugs that Stabilize Microtubules
2.1K
Microtubules are dynamic structures that undergo cycles of catastrophe and rescue. The microtubules play a central role in cell division by forming the spindle apparatus for segregating the chromosomes. This makes them ideal targets for regulating dividing cells in tumors and malignant cancer cells. Microtubule stabilizing drugs help stabilize the microtubule formation and promote its polymerization. Paclitaxel was the first microtubule stabilizing agent used as anticancer drug in chemotherapy...
2.1K
01:45Destabilization of Microtubules
2.8K
The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
2.8K
02:17Microtubule Instability
5.2K
Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
5.2K
01:42Microtubule Associated Proteins (MAPs)
4.5K
Microtubule function and architecture are regulated by an array of specialized proteins called microtubule-associated proteins or MAPs. These proteins are widespread across different organisms and have conserved protein motifs, like the multi-TOG domain for tubulin binding found in the CLASP family of MAPs. Some MAPs are lineage-specific based on their conserved domains. Their functions depend upon the cytoskeletal architecture and cell type they are located within. In-plant cells, a specific...
4.5K
01:10Drugs that Destabilize Microtubules
2.0K
Microtubules are dynamic structures and can be regulated by microtubule targeting agents (MTAs). Microtubule destabilizing drugs are a class of MTAs that destabilize and prevent microtubules' polymerization. Both natural and synthetic chemicals can be found under this class of drugs. Vincristine and vinblastine, two vinca alkaloids, and colchicine were among the first to be discovered. These drugs can affect cells in various ways, either by inducing a change in cell morphology, preventing...
2.0K
01:23Microtubule Formation
5.9K
Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation...
5.9K