EMBL Keynote Lecture: Discovery, Properties & Purification of a Tubulin, Michael Shelanski

EMBL Keynote Lecture: Discovery, Properties & Purification of a Tubulin, Michael Shelanski

Title history
  • EMBL Keynote Lecture: Discovery, Properties & Purification of a Tubulin, Michael Shelanski — observed on 20261026-1722 UTC (YouTube)

by Michael L. Shelanski · View the channel on PSI

Life & Natural Systems Biology PSBiology, life sciencesPSDMolecular biology
🎙 Michael L. Shelanski 👥 16K 📅 July 23, 2026 ⏱ 33 min 👁 163 📄 expert opinion 🧭 2026-10-26
Available in: English (current) Français

Keywords

microtubulestubulincolchicineprotein purificationcell biology

Summary

In this keynote lecture, Michael Shelanski recounts the historical journey that led to the identification and purification of tubulin, the major protein component of microtubules. He begins with his initial ambition to study brain physiology, influenced by early cybernetics and artificial intelligence papers, and describes how he was diverted into cell biology under the mentorship of Ed Taylor. The talk covers the early electron microscopy observations, the introduction of glutaraldehyde fixation, and the use of radioactive colchicine to identify a specific binding protein, which turned out to be tubulin. Shelanski highlights the contributions of colleagues like Gary Borisy and Dick Weisenberg, focusing on the development of purification methods using centrifugation and chromatography. A major breakthrough was the reassembly of microtubules in vitro, achieved by Weisenberg through the addition of GTP and calcium chelation. Shelanski also discusses his own work on thermal cycling purification and turbidimetric measurement of assembly, and candidly admits to missing the discovery of dynamic instability, later elegantly established by Marc Kirschner. The talk concludes with advances in fluorescent labeling, modern microscopy, and reflections on mentorship and the collaborative nature of science.

184 words

Critical Evaluation

Value of the Information & Strength of the Argument

The value of this talk lies in its first-hand historical account of a seminal period in cell biology, offering unique insights into the personalities, challenges, and methodological constraints of the time. The argumentation is coherent and persuasive, combining personal anecdotes with concrete experimental results, though it lacks formal citations and relies heavily on memory. The speaker’s authority and direct involvement add weight to the narrative, but the lack of verifiable sources limits its scholarly rigor.

Scientific Rigor, Source Quality, Title Accuracy

The talk is scientifically rigorous in its factual claims, as the speaker was a key participant in the discoveries described. However, specific references to published papers are often implicit rather than explicit, and external sources are not cited. The title accurately reflects the content, which systematically covers the discovery, properties, and purification of tubulin, though it does not prepare the viewer for the personal and historical framing.

157 words

Title / Content Match

The title accurately describes the content, covering the discovery, properties, and purification of tubulin.

Quality & Reliability

8/10

The speaker is a prominent researcher directly involved in the discoveries, and the talk is from a professional symposium. However, it relies on anecdotal recollections and does not provide formal citations.

Key Moments

Markers derived by PSI from the transcript: the creator did not define chapters.

Contribution & Novelties

This talk provides an original, first-person perspective on the discovery and purification of tubulin, offering personal stories and insights that are not available in primary literature. It highlights the collaborative and often serendipitous nature of scientific discovery, and the importance of mentorship. The main novelty is the historical context and the human element behind landmark experiments.

Pour aller plus loin :

  • Tubulin — Overview of the protein family and its role.
  • Microtubule — Structure, dynamics, and cellular functions.
  • Colchicine — The drug used to identify tubulin, including its mechanism of action.
  • Dynamic instability — Concept that Shelanski admits to missing, central to microtubule behavior.

104 words

Radar Profile

The profile shows a content with high quality and reliability, moderate quantity and technical depth, fitting a historical review by an expert.

Reliability 8/10