Phosphorylation of tubulin by a calmodulin-dependent protein kinase.

Calmodulin-dependent protein kinase was purified from porcine brain cytosol through sequential steps involving acid precipitation, DEAE-chromatography, and calmodulin-Sepharose chromatography. The purified enzyme contained a major Mr 50,000 and a minor Mr 60,000 peptide. Porcine brain tubulin was a major substrate for this kinase. Under optimal conditions 2.6 mol of phosphate were incorporated per mol of tubulin. The kinase phosphorylated both tubulin subunits at their carboxyl-terminal region. Limited proteolysis, using trypsin and chymotrypsin, of phosphorylated and unphosphorylated tubulins resulted in different cleavage patterns as determined by peptide mapping. Phosphorylated tubulin was unable to bind to microtubule-associated protein or to polymerize, but regained its assembly capacity after phosphatase treatment.

• Publication year

  1986

• Venue

  Journal of Biological Chemistry

• Publication date

  1986-08-05

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1016/s0021-9258(18)67528-3PMID 3733711
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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