Rapid colchicine competition-binding scintillation proximity assay using biotin-labeled tubulin.

Abstract:

:We have developed a rapid [3H]colchicine competition-binding scintillation proximity assay (SPA) to evaluate antimitotic compounds that bind to the colchicine-binding site on tubulin. The premise of our assay is that compounds will compete with radiolabeled colchicine for the tubulin-binding domain. Biotin-labeled tubulin is incubated first with unlabeled compound and radiolabeled ligand. Streptavidin-labeled SPA beads are added, and the radiolabel associated with tubulin is directly counted with no separation steps. Under our experimental conditions, the dissociation constant of binding (Kd) for colchicine to tubulin was determined to be 1.4 microM, which was consistent with previously reported values. Assay validation was performed by competitively inhibiting [3H]colchicine binding to tubulin with known microtubule inhibitors and comparing their inhibition constants (Ki). Our SPA bead method is a powerful tool since it overcomes the disadvantage of traditional filtration techniques, as there are no separation steps. It is extremely easy to set up, multiple samples can be assayed and supply and labor costs are reduced because of the minimal volume and test reagents used.

journal_name

Biotechniques

journal_title

BioTechniques

authors

Tahir SK,Kovar P,Rosenberg SH,Ng SC

doi

10.2144/00291rr02

subject

Has Abstract

pub_date

2000-07-01 00:00:00

pages

156-60

issue

1

eissn

0736-6205

issn

1940-9818

journal_volume

29

pub_type

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