Abstract
A cytosolic protein‐tyrosine kinase has been highly purified from porcine spleen using [Val5]angiotensin II as a substrate. The purification procedure involves sequential column chromatographies on phosphocellulose, Sephacryl S‐200, casein‐Sepharose 4B, heparin‐Sepharose CL‐6B and anti‐(4‐aminobenzyl phosphonic acid)– Sepharose 4B. Analysis of the most highly purified preparation by SDS/PAGE revealed a major silver‐stained band of molecular mass 40 kDa. The 40‐kDa cytosolic protein‐tyrosine kinase was purified approximately 10000‐fold with an overall yield of about 7%. It had autophosphorylation activity which was carried out by intramolecular catalysis. The stoichiometory of phosphate incorporation was about 1 mol phosphate/mol enzyme. In the autophosphorylation reaction, the apparent Km value for ATP was relatively low, 0.35 μM; Mn2+ was slightly preferred to Mg2+ as divalent cation. [Val5]Angiotensin II phosphorylation activity of the 40‐kDa kinase increased with the amount of phosphate incorporated into the enzyme. A phosphate exchange reaction was observed during the autophosphorylation. These results suggest that the 40‐kDa kinase described here is a different type of protein‐tyrosine kinase than the enzymes so far reported.
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Dates
Type | When |
---|---|
Created | 20 years, 5 months ago (March 3, 2005, 10:50 p.m.) |
Deposited | 1 year, 10 months ago (Oct. 6, 2023, 8:17 p.m.) |
Indexed | 1 month, 1 week ago (July 20, 2025, 12:31 a.m.) |
Issued | 35 years, 5 months ago (March 1, 1990) |
Published | 35 years, 5 months ago (March 1, 1990) |
Published Online | 20 years, 5 months ago (March 3, 2005) |
Published Print | 35 years, 5 months ago (March 1, 1990) |
@article{KOBAYASHI_1990, title={Purification and characterization of a cytosolic protein‐tyrosine kinase from porcine spleen}, volume={188}, ISSN={1432-1033}, url={http://dx.doi.org/10.1111/j.1432-1033.1990.tb15433.x}, DOI={10.1111/j.1432-1033.1990.tb15433.x}, number={3}, journal={European Journal of Biochemistry}, publisher={Wiley}, author={KOBAYASHI, Tomoko and NAKAMURA, Shun‐ichi and TANIGUCHI, Takanobu and YAMAMURA, Hirohei}, year={1990}, month=mar, pages={535–540} }