Conformation-Sensing Antibodies Stabilize the Oxidized Form of PTP1B and Inhibit Its Phosphatase Activity

Haque, Aftabul, Andersen, J. N., Salmeen, A., Barford, D., Tonks, N. K. (September 2011) Conformation-Sensing Antibodies Stabilize the Oxidized Form of PTP1B and Inhibit Its Phosphatase Activity. Cell, 147 (1). pp. 185-198. ISSN 0092-8674

URL: http://www.ncbi.nlm.nih.gov/pubmed/21962515
DOI: 10.1016/j.cell.2011.08.036

Abstract

Summary Protein tyrosine phosphatase 1B (PTP1B) plays important roles in downregulation of insulin and leptin signaling and is an established therapeutic target for diabetes and obesity. PTP1B is regulated by reactive oxygen species (ROS) produced in response to various stimuli, including insulin. The reversibly oxidized form of the enzyme (PTP1B-OX) is inactive and undergoes profound conformational changes at the active site. We generated conformation-sensor antibodies, in the form of single-chain variable fragments (scFvs), that stabilize PTP1B-OX and thereby inhibit its phosphatase function. Expression of conformation-sensor scFvs as intracellular antibodies (intrabodies) enhanced insulin-induced tyrosyl phosphorylation of the β subunit of the insulin receptor and its substrate IRS-1 and increased insulin-induced phosphorylation of PKB/AKT. Our data suggest that stabilization of the oxidized, inactive form of PTP1B with appropriate therapeutic molecules may offer a paradigm for phosphatase drug development.

Item Type: Paper
Subjects: bioinformatics > genomics and proteomics > genetics & nucleic acid processing > protein structure, function, modification > protein types > antibodies
diseases & disorders > nutritional and metabolic diseases > diabetes
CSHL Authors:
Communities: CSHL Cancer Center Shared Resources > Microscopy Service
CSHL labs > Tonks lab
CSHL Cancer Center Program > Signal Transduction
Depositing User: CSHL Librarian
Date: 30 September 2011
Date Deposited: 12 Oct 2011 20:58
Last Modified: 16 Oct 2015 13:57
PMCID: PMC3200309
Related URLs:
URI: http://repository.cshl.edu/id/eprint/15557

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