Tubulin Purification
Tubulin Purification - Related Videos
02:40
Second Harmonic Generation Imaging in a Rat Model to Study Tubulin Defects
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2025
Source: Piazza, V., et al., Label-Free Non-Linear Optics for the Study of Tubulin-Dependent Defects in Central Myelin. J. Vis. Exp. (2023)This video demonstrates the procedure for imaging microtubule abnormalities in a rat brain tissue slice using a two-photon excitation microscope. It employs second harmonic generation (SHG) signals to detect tubulin defects and reduced myelin production.
07:54
Purification of Tubulin with Controlled Posttranslational Modifications and Isotypes from Limited Sources by Polymerization-Depolymerization Cycles
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Cited by 6 •
2020
This protocol describes tubulin purification from small/medium-scale sources such as cultured cells or single mouse brains, using polymerization and depolymerization cycles. The purified tubulin is enriched in specific isotypes or has specific posttranslational modifications and can be used in in vitro reconstitution assays to study microtubule dynamics and interactions.
08:16
Plasmid Purification
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2023
Plasmid purification is a technique used to isolate and purify plasmid DNA from genomic DNA, proteins, ribosomes, and the bacterial cell wall. A plasmid is a small, circular, double-stranded DNA that is used as a carrier of specific DNA molecules. When introduced into a host organism via transformation, a plasmid will be replicated, creating numerous copies of the DNA fragment under study. In this video, a step-by-step generalized procedure is described for how to perform plasmid purification.
06:30
Gel Purification
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2023
Gel purification is used to recover DNA fragments after electrophoretic separation. DNA recovery from an agarose gel includes three basic steps: binding, washing and eluting from a silica column. DNA is believed to bind to silica in the presence of high salt via a salt bridge. Following binding, DNA is washed of impurities and eluted under low salt conditions disrupting this interaction. This video goes through a step-by-step, generalized procedure for cutting out a band from the gel, gel...
06:30
Optimizing Tubulin Yield from Porcine Brain Tissue
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2024
This protocol describes a technique for the high-yield isolation of tubulin from the porcine brain optimized for small-scale instrumentation. The isolation procedures are complemented by procedures for determining tubulin polymerization activity in vitro using co-sedimentation assays and transmission electron microscopy.
FAQs
Tubulin purification exploits the ability of α/β-tubulin to assemble into microtubules when GTP-dependent conditions favor polymerization and to disassemble when conditions favor depolymerization. Alternating these states helps separate tubulin from other cellular components. Repeating the cycle enriches the preparation, while temperature control and stabilizing agents help preserve the desired assembly state during processing.
Each cycle provides a biochemical enrichment step based on tubulin’s reversible assembly behavior. Tubulin enters the microtubule fraction during polymerization and returns to a soluble form during depolymerization, allowing unwanted material to be progressively reduced. This repeated selection produces a more defined protein preparation for experiments that require controlled microtubule formation and behavior.
Stabilizing compounds favor persistence of assembled microtubules, whereas destabilizing compounds interfere with their maintenance or assembly. Purified tubulin makes these effects easier to examine because the system contains a defined protein substrate rather than the many interacting components of a cell. Such comparisons help connect compound action with changes in microtubule organization and dynamics.
The key variables are GTP-dependent assembly conditions, temperature, and the presence of stabilizing agents. Together, they determine whether tubulin is predominantly incorporated into microtubules or maintained in a disassembled state during enrichment. Managing these conditions is important because inconsistent assembly and disassembly can reduce the quality or reproducibility of the purified material.
A typical workflow begins with cell or tissue lysis, followed by centrifugation to separate cellular fractions. The material then undergoes controlled microtubule polymerization and depolymerization, often through repeated cycles that exploit tubulin’s biochemical properties. The resulting enriched preparation can be collected as a defined source of tubulin for subsequent reconstitution and analysis.
Purified tubulin supports biochemical assays that measure microtubule dynamics, examine motor-protein activity, and test interactions with microtubule-targeting drugs. Because the protein is available in a controlled preparation, researchers can evaluate molecular effects without relying solely on intact cells. These assays help relate changes in microtubule behavior to specific biochemical mechanisms.
A defined tubulin preparation allows researchers to rebuild microtubule-based processes under controlled biochemical conditions. Reconstitution experiments can connect molecular events, such as assembly behavior or motor-protein activity, with broader cytoskeletal functions. In biochemistry, this provides a way to isolate individual mechanisms and determine how particular components or compounds influence microtubule organization.