Fibroblast Tubulin

Richard Ostlund, Ira Pastan

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Tubulin purified from L cells by Sepharose 4B and DEAE-cellulose chromatography has properties similar to brain tubulin. The specific activity of colchicine binding is 1.1 mol of colchicine bound per 100,000 g of protein. From 0.07 to 0.45% of the total protein of L cells is active tubulin. Proteins differing biochemically from tubulin but coelectrophoresing with it in sodium dodecyl sulfate gels were encountered. Colchicine-binding activity of virustransformed NRK fibroblasts measured by a filter assay using a whole cell homogenate was reduced when compared to the parent NRK cells. L cells growing on plastic or glass surfaces had five times as much colchicine-binding activity as the same cells growing in spinner culture. Apparently growth on a surface increases the tubulin content of L cells.

Original languageEnglish
Pages (from-to)4064-4068
Number of pages5
Issue number18
StatePublished - Sep 1 1975


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