Hepatic protein tyrosine phosphatases in the rat

P. A. Gruppuso, J. M. Boylan, B. L. Smiley, Robert Fallon, D. L. Brautigan

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Regulation of cell growth and metabolism by protein tyrosine phosphorylation involves dephosphorylation via the action of protein tyrosine phosphatases (PTPases). We have characterized the membrane PTPases in rat liver, monitoring their activity by measuring the dephosphorylation of P-Tyr-reduced, carboxyamidomethylated and maleylated lysozyme (P-Tyr-RCML) and P-Tyr-myelin basic protein (P-Tyr-M BP). Separation of membrane PTPases by poly (L-lysine) chromatography yielded three peaks of PTPase, termed I, II and III. PTPases I and II were most active with P-Tyr-RCML, whereas PTPase III showed greater activity with P-Tyr-MBP than with P-Tyr-RCML (ratio of activities 4: 1). Separation of membrane proteins by gel-filtration chromatography yielded two peaks of activity. Based on substrate specificity, sensitivity to inhibitors and requirement for thiol-containing compounds, the activity peak with an M(r) of ~400000 corresponded to PTPase III, whereas that with an M(r) of approx. 40000 contained PTPases I and II. All three PTPases dephosphorylated epidermal growth factor receptors and insulin receptors, but only PTPases I and II were active with P-Tyr-asialoglycoprotein receptors. Although none of the above characteristics distinguished between PTPases I and II, only PTPase I reacted in a Western immunoblotting procedure with anti-peptide antibodies directed towards human placental PTPase. We conclude that the membrane fraction from rat liver contains at least three distinct PTPases.

Original languageEnglish (US)
Pages (from-to)361-367
Number of pages7
JournalBiochemical Journal
Volume274
Issue number2
StatePublished - 1991
Externally publishedYes

Fingerprint

Protein Tyrosine Phosphatases
Rats
Liver
Muramidase
Membrane Proteins
Chromatography
Asialoglycoprotein Receptor
Phosphorylation
Myelin Basic Protein
Insulin Receptor
Cell growth
Substrate Specificity
Sulfhydryl Compounds
Metabolism
Lysine
Gel Chromatography
Tyrosine
Anti-Idiotypic Antibodies

ASJC Scopus subject areas

  • Biochemistry

Cite this

Gruppuso, P. A., Boylan, J. M., Smiley, B. L., Fallon, R., & Brautigan, D. L. (1991). Hepatic protein tyrosine phosphatases in the rat. Biochemical Journal, 274(2), 361-367.

Hepatic protein tyrosine phosphatases in the rat. / Gruppuso, P. A.; Boylan, J. M.; Smiley, B. L.; Fallon, Robert; Brautigan, D. L.

In: Biochemical Journal, Vol. 274, No. 2, 1991, p. 361-367.

Research output: Contribution to journalArticle

Gruppuso, PA, Boylan, JM, Smiley, BL, Fallon, R & Brautigan, DL 1991, 'Hepatic protein tyrosine phosphatases in the rat', Biochemical Journal, vol. 274, no. 2, pp. 361-367.
Gruppuso PA, Boylan JM, Smiley BL, Fallon R, Brautigan DL. Hepatic protein tyrosine phosphatases in the rat. Biochemical Journal. 1991;274(2):361-367.
Gruppuso, P. A. ; Boylan, J. M. ; Smiley, B. L. ; Fallon, Robert ; Brautigan, D. L. / Hepatic protein tyrosine phosphatases in the rat. In: Biochemical Journal. 1991 ; Vol. 274, No. 2. pp. 361-367.
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