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Title: Allosteric Inhibition of Bcr-Abl Kinase by High Affinity Monobody Inhibitors Directed to the Src Homology 2 (SH2)-Kinase Interface

Journal Article · · Journal of Biological Chemistry
 [1];  [2];  [3];  [1];  [1];  [2];  [2];  [4]
  1. Univ. of Chicago, IL (United States)
  2. Ecole Polytechnique Federale Lausanne (Switzerland)
  3. Univ. of Chicago, IL (United States); Univ. of Gdansk (Poland)
  4. Univ. of Chicago, IL (United States); New York Univ. Langone Medical Center, NY (United States)

Bcr-Abl is a constitutively active kinase that causes chronic myelogenous leukemia. We have shown that a tandem fusion of two designed binding proteins, termed monobodies, directed to the interaction interface between the Src homology 2 (SH2) and kinase domains and to the phosphotyrosine-binding site of the SH2 domain, respectively, inhibits the Bcr-Abl kinase activity. Because the latter monobody inhibits processive phosphorylation by Bcr-Abl and the SH2-kinase interface is occluded in the active kinase, it remained undetermined whether targeting the SH2-kinase interface alone was sufficient for Bcr-Abl inhibition. To address this question, we generated new, higher affinity monobodies with single nanomolar KD values targeting the kinase-binding surface of SH2. Structural and mutagenesis studies revealed the molecular underpinnings of the monobody-SH2 interactions. Importantly, the new monobodies inhibited Bcr-Abl kinase activity in vitro and in cells, and they potently induced cell death in chronic myelogenous leukemia cell lines. Lastly, this work provides strong evidence for the SH2-kinase interface as a pharmacologically tractable site for allosteric inhibition of Bcr-Abl.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Inst. of Health
Grant/Contract Number:
AC02-06CH11357; GM090324; P41 GM103403; T32GM07281; P30CA014599; KLS-3132-02-2013; KLS-3595-02-2015; S10 RR029205
OSTI ID:
1249239
Journal Information:
Journal of Biological Chemistry, Vol. 291, Issue 16; ISSN 0021-9258
Publisher:
American Society for Biochemistry and Molecular BiologyCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Cited By (7)

Chronic myeloid leukemia: the paradigm of targeting oncogenic tyrosine kinase signaling and counteracting resistance for successful cancer therapy journal February 2018
Switching Aurora-A kinase on and off at an allosteric site journal April 2017
Btk SH2-kinase interface is critical for allosteric kinase activation and its targeting inhibits B-cell neoplasms posted_content December 2019
Monobodies and other synthetic binding proteins for expanding protein science: Monobodies and Other Synthetic Binding Proteins journal March 2017
Optogenetic regulation of endogenous proteins journal January 2020
Btk SH2-kinase interface is critical for allosteric kinase activation and its targeting inhibits B-cell neoplasms journal May 2020
Btk SH2-kinase interface is critical for allosteric kinase activation and its targeting inhibits B-cell neoplasms text January 2020