A synthetic tris-sulfotyrosyl dodecapeptide analogue of the insulin receptor 1146-kinase domain inhibits tyrosine dephosphorylation of the insulin receptor in situ

A synthetic tris-sulfotyrosyl dodecapeptide (TRDIY(S)ETDY(S)Y(S)RK-amide), whose primary sequence is identical to the 1142-1153 sequence of the insulin proreceptor, inhibited insulin receptor dephosphorylation in solubilized membranes, and digitonin-permeabilized cells derived from Chinese hamster o...

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Bibliographic Details
Published in:The Journal of biological chemistry 1994-09, Vol.269 (37), p.22996-23001
Main Authors: Liotta, A S, Kole, H K, Fales, H M, Roth, J, Bernier, M
Format: Article
Language:English
Subjects:
Alkaline Phosphatase - metabolism
Amino Acid Sequence
Animals
Cell Membrane Permeability
CHO Cells
Cricetinae
Cricetulus
Humans
Molecular Sequence Data
Oligopeptides - chemical synthesis
Oligopeptides - pharmacology
Phosphoprotein Phosphatases - metabolism
Phosphorylation - drug effects
Receptor, Insulin - drug effects
Receptor, Insulin - metabolism
Recombinant Proteins - metabolism
Tyrosine - metabolism
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Summary:A synthetic tris-sulfotyrosyl dodecapeptide (TRDIY(S)ETDY(S)Y(S)RK-amide), whose primary sequence is identical to the 1142-1153 sequence of the insulin proreceptor, inhibited insulin receptor dephosphorylation in solubilized membranes, and digitonin-permeabilized cells derived from Chinese hamster ovary (CHO) cells expressing high levels of human insulin receptors (CHO/HIRc). It also inhibited the dephosphorylation of a synthetic tyrosine phosphorylated substrate by recombinant PTP-1B, a protein tyrosine phosphatase (PTPase), indicating that it acted via interaction with PTPase(s). A N-stearyl derivative of the peptide caused an approximately 4.5-fold increase in insulin-stimulated receptor autophosphorylaction in intact CHO/HIRc cells. The peptide displayed specificity toward tyrosine-class phosphatases only, as it had no effect on the activities of the serine/threonine phosphatases PP-1 and PP-2A, or alkaline phosphatase. The tyrosine sulfate ester bonds of the peptide were stable when incubated with PTP-1B (1 h, 30 degrees C). These data suggest that the sulfotyrosyl peptide functions as a nonhydrolyzable phosphotyrosyl peptide analogue capable of direct interaction with PTPase catalytic domain.
ISSN:0021-9258
1083-351X
DOI:10.1016/S0021-9258(17)31609-5