Computational dissection of allosteric inhibition of the SH2 domain of Bcr-Abl kinase by the monobody inhibitor AS25.

Abstract:

:The deregulated breakpoint cluster region (Bcr)-Abelson tyrosine kinase (Abl) fusion protein represents an attractive pharmacological target for the treatment of chronic myeloid leukemia (CML). The high affinity of monobody AS25 was designed to target the Src homology 2 (SH2) domain of Bcr-Abl, leading to allosteric inhibition of Bcr-Abl through formation of protein-protein interactions. An I164E mutation in the SH2 domain disrupts AS25 binding to the SH2 domain of Bcr-Abl. The detailed mechanisms, however, remain to be unresolved. Here, molecular dynamics (MD) simulations and binding free energy calculations were performed to explore the conformational and energetic differences between the wild-type (WT) complexes of Bcr-Abl SH2 domain and AS25 (SH2WT-AS25) as well as the mutated complexes (SH2I164E-AS25). The results revealed that I164E mutation not only caused an increase in the conformational flexibility of SH2-AS25 complexes, but also weakened the binding affinity of AS25 to SH2. The comparative binding modes of SH2-AS25 complexes between WT and the I164E mutant were comprehensively analyzed to unravel the disruption of hydrophobic and hydrogen bonding interactions in the interface of the SH2-AS25 complex triggered by the I164E mutation. The results obtained may help to design the next generation of higher affinity Bcr-Abl SH2-specific peptide inhibitors.

journal_name

J Mol Model

authors

Ji M,Zheng G,Li X,Zhang Z,Jv G,Wang X,Wang J

doi

10.1007/s00894-017-3353-5

subject

Has Abstract

pub_date

2017-06-01 00:00:00

pages

183

issue

6

eissn

1610-2940

issn

0948-5023

pii

10.1007/s00894-017-3353-5

journal_volume

23

pub_type

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