Purification of a phosphoprotein from rat brain closely related to the 80 kDa substrate of protein kinase C identified in Swiss 3T3 fibroblasts
- 25 April 1988
- journal article
- research article
- Published by Wiley in FEBS Letters
- Vol. 231 (2), 311-316
- https://doi.org/10.1016/0014-5793(88)80840-8
Abstract
A phosphoprotein expressed in rat brain is closely related to the 80 kDa substrate of protein kinase C present in 3T3 cells. The protein kinase C substrates from both sources migrate identically on two-dimensional gel electrophoresis and give similar phosphopeptide fragments when digested with protease. Using a series of chromatographic steps, including DEAE-cellulose chromatography, Sephadex G150 gel filtration and reverse phase fast protein liquid chromatography, this phosphoprotein was purified 3800-fold from rat brain. The preparation appears homogenous by one- and two-dimensional gel electrophoresis, is an effective substrate of protein kinase C and contains a high proportion of the acidic amino acids glutamate and aspartate, and of alanine.Keywords
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